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Understanding the dynamic spatial distribution and characteristics of fishing activities is crucial for fisheries management and sustainable development. In recent years, small pelagic fish and cephalopods in the Arabian Sea have become new targets for light purse seine fishing; however, there is a lack of publicly available reports. This study uses automatic identification system (AIS) data from January to May and October to December of 2021 to 2022 in the region between 58°–70° E and 10°–22° N to extract spatial distribution information through three methods. The results show that with a spatial resolution of 0.25° × 0.25°, the spatial similarity index between the fishing ground information extracted in 2022 and catch data was consistently above 0.60, reaching 0.76 in March 2021 and 0.79 in November 2022, while the spatial similarity index in March 2022 exceeded 0.71. The spatial distribution of fishing effort and kernel density was similar to that of the fishing grounds, and the fishing intensity information exhibited the highest spatiotemporal similarity with commercial catch data, making it more suitable as a substitute for fishery data. Therefore, effective international cooperation and efficient joint management mechanisms for fishing vessels are needed to enhance the regulatory oversight of fishing vessels in this region. Integrating AIS data with other technological methods is crucial for more effective monitoring and management of fishing vessels. The findings presented in this paper provide both quantitative and qualitative scientific support for resource conservation and sustainable development in the region. [ABSTRACT FROM AUTHOR]

Glugea sp. found infecting the liver of the teleost fish Carangoides bajad from the Red Sea, Egypt, is described based on light microscopy and ultrastructural characteristics combined with phylogenetic analyses. This microsporidium forms whitish xenomas up to ~4 mm in size. Xenomas display numerous parasitophorous vacuoles totally filled by mature spores, no other life cycle stages were observed. Mature spores ellipsoidal and measuring 6.3 × 4.0 μm in size. The polaroplast appears composed of two distinct regions: an electron‐dense vesicular region and a densely packed lamellar region. The polar tubule forms approximately 24–27 coils arranged in three layers encircling the posterior vacuole. The small subunit (SSU) rRNA gene and its ITS region were sequenced and showed the highest similarity of 99.4% to other Glugea spp. Bayesian inference and maximum likelihood analyses place the novel isolate within the Glugea clade, more specifically within a subclade that predominantly grouped species described from fish inhabiting the Arabian Gulf or Red Sea. The results validate the parasite's classification in the Glugea genus. Nevertheless, until more detailed ultrastructural and molecular data are obtained, the identification of the current Glugea species is hampered by the absence of some developmental stages and the high degree of genetic similarity. [ABSTRACT FROM AUTHOR]

Reef ecosystems are characterized by highly heterogenous habitats and functionally diverse fish communities. Few studies have examined how functional diversity differs among habitats within these communities, i.e., species associated with a specific habitat may have similar trophic ecologies meaning that the functional diversity within the community is driven by habitat diversity or, conversely, high functional diversity within each habitat would indicate that resource segregation also occurs at the habitat level. We used stable isotope ratios of carbon and nitrogen to estimate trophic position, resource use and ontogenetic niche shifts of 15 reef fishes associated with four distinct habitat types (cryptobenthic, epibenthic sand, epibenthic rock and hyperbenthic) on the Croatian coast of the Adriatic Sea. Trophic ecology was quite similar across fish assemblages, but there was strong evidence of niche segregation among fish species within each assemblage showing high functional diversity within each microhabitat. The sampled fish community contained benthic and pelagic resource users, along with multiple intermediate generalists. Consumer stable isotope ratios revealed considerable interspecific variation in resource use among fishes within each habitat type. The cryptobenthic fishes were a notable exception to this trend with the narrow range of resource use values, indicating reliance of these species on a single resource. The greatest diversity of trophic positions within a guild was observed in cryptobenthic and rock‐associated epibenthic fishes. The majority of observed ontogenetic variation in studied fish species reflected an increase in benthic resource use and trophic position. However, the degree of ontogenetic variation in trophic ecology of studied species, if present, was generally low, showing no dramatic change in the ecology of any species. The size structuring among guilds was considerable, with cryptobenthic fishes the smallest on average and hyperbenthic fishes the largest, despite guilds having similar ranges of trophic positions. [ABSTRACT FROM AUTHOR]

The South China Sea (SCS), one of the world's most important fishing areas, faces a looming fishing crisis. This impending catastrophe is chiefly driven by rampant overfishing and illegal activities, intensified by escalating maritime conflicts. Current research predominantly fixates on maritime territorial and sovereignty disputes, typically emphasizing the state's primary or exclusive role in the SCS fishery governance. The state centric approach, however, overlooks the integral role of substate entities. This research introduces a new dimension to the discussion, highlighting the pivotal role of subnational governments in China with an in-depth case study on the Hainan provincial government. Utilising the fragmented authoritarianism framework and through a comprehensive analysis of central and local policy documents, news reports, and academic articles, this research discerns Hainan's significant but understudied role in contributing to the SCS fishery crisis. Hainan's impact on SCS fisheries is particularly manifest in three key areas: the advocacy for outward expansion of marine fisheries, the endorsement of Hainan's Giant Clam Handicraft sectors, and the securitization of its fishing fleet in the South China Sea. [ABSTRACT FROM AUTHOR]

Overfishing, bycatch, and other anthropogenic threats may lead to the destruction of fragile habitats and substantial losses of marine life. Marine fishery resources can be protected by adjusting fishing intensity and establishing marine reserves. Currently, China adopts the closed fishing seasonmanagement approach to protect traditional fishing grounds, where fine spatio-temporal prediction is essential to efficiently supervise the wide scope. Fishing vessel behaviors reflect fishers' experience as well as the information provided by fish detection radar, while the fishery resource distribution is relevant to the marine environment. In this study, we identified fishing vessel behaviors (gillnets, trawls, purse seines, and abnormal behaviors) and qualitatively assessed and predicted fishing time of different fishing vessel behaviors to search for high intensity fishing operation areas by constructing a time-space prediction model. The model was based on big data of fishing vessel automatic identification systems and3 the marine environment, and was verified in the East China Sea. The prediction results generally corresponded with the distribution of traditional fishery resources in the East China Sea and the fishing efforts provided by the Global Fishing Watch. This model can provide an accurate and effective refined fishing vessel operation time prediction, and benefits fishing management and fishery resources protection. [ABSTRACT FROM AUTHOR]

A critical question in biology is how new traits evolve, but studying this in wild animals remains challenging. Here, we probe the genetic basis of trait gain in sea robin fish, which have evolved specialized leg-like appendages for locomotion and digging along the ocean floor. We use genome sequencing, transcriptional profiling, and interspecific hybrid analysis to explore the molecular and developmental basis of leg formation. We identified the ancient, conserved transcription factor tbx3a as a major determinant of sensory leg development. Genome editing confirms that tbx3a is required for normal leg formation in sea robins, and for formation of enlarged central nervous system lobes, sensory papillae, and adult digging behavior. Our study establishes sea robins as a model organism for studying the evolution of major trait gain and illustrates how ancient developmental control genes can underlie novel organ formation. [Display omitted] • Sea robins are fish that walk and probe substrate with leg-like structures • Transcriptomics identifies ancient genes controlling leg formation from fins • Genome editing of tbx3a disrupts legs, nervous system structures, and behavior • Analysis of sea robin hybrids reveals genes underlying trait differences Herbert et al. determine that ancient genes involved in limb formation play a key role in the development of new leg-like appendages with unique sensory functions in sea robin fish. [ABSTRACT FROM AUTHOR]

How do animals evolve new traits? Sea robins are fish that possess specialized leg-like appendages used to "walk" along the sea floor. Here, we show that legs are bona fide sense organs that localize buried prey. Legs are covered in sensory papillae that receive dense innervation from touch-sensitive neurons, express non-canonical epithelial taste receptors, and mediate chemical sensitivity that drives predatory digging behavior. A combination of developmental analyses, crosses between species with and without papillae, and interspecies comparisons of sea robins from around the world demonstrate that papillae represent a key evolutionary innovation associated with behavioral niche expansion on the sea floor. These discoveries provide unique insight into how molecular-, cellular-, and tissue-scale adaptations integrate to produce novel organismic traits and behavior. [Display omitted] • Sea robins are walking fish that use novel leg-like appendages as sensory organs • A small clade of specialists elaborated sensory legs for locating buried prey • Sensation is mediated by mechanosensitive neurons and epithelial taste receptors • Leg papillae mediate sensory specialization across species and development Allard et al. exploit an unusual fish called the sea robin, which possesses six leg-like sensory appendages, to understand how novel traits arise and diversify to drive new behaviors. [ABSTRACT FROM AUTHOR]

This study aims at assessing the reserve effect on fish assemblage in a small urban fully protected and highly enforced Marine Protected Area (MPA), Larvotto MPA (Monaco, Mediterranean Sea). The data about fish density, size, and biomass was collected by underwater visual census in the MPA and unprotected areas in two habitats, artificial rocky substrates and Posidonia oceanica meadows. On artificial rocky substrates, we recorded significantly higher fish biomass within the MPA compared to unprotected areas, while no significant difference was detected on Posidonia , with this suggesting the habitat-specific responses of fish assemblages to protection. Here we highlight the potential effectiveness of highly enforced small-sized urban MPAs, such as the Larvotto MPA, in generating ecological benefits, and speculate about their potential role in supporting networks of MPAs. This study supports increased attention to urban MPAs in conservation efforts, emphasizing the need for efficient management strategies in the face of ongoing coastal expansion. [ABSTRACT FROM AUTHOR]

This paper provides first information about possible occurrence of the myxosporean genus Kudoa in fish of the World Ocean and, in some cases, in associated freshwater bodies at different depths. An analysis of the theoretically assumed site preference by Kudoa of different habitat depths of their fish hosts in the World Fauna is made for the first time. It is revealed that all species of the myxosporean genus Kudoa can be found in coastal shelf zones, of which 90 species (70.8% of the total) occur exclusively in the shelf zone, and the hosts of 50 Kudoa species (39.4%) live in its shallowest part (down to 50 m). 16 species (12.6%) and 14 species (11%) of this genus can be found at depths from the shelf to 500 meters and 1000 meters, respectively. From 1 to 3 species of Kudoa can be encountered theoretically at 1500 m to 3000 m, which is from 0.8 to 2.4% of all known representatives of these parasites. [ABSTRACT FROM AUTHOR]

Fish provide energy, protein, and other important nutrients, including n-3 fatty acids, vitamin D, and iodine. However, some species of fish could contain contaminants such as mercury and dioxins. The aim of the study was to assess the frequency of fish consumption in Poland, including of sea and freshwater fish species, referring to some socio-economic determinants. The frequency of consumption was assessed using Food Propensity Questionnaire data from 1489 adults (722 males, 767 females) in 2019–2020. The fish consumption frequency in Polish adults was lower than the recommendation (at least twice a week). About 80% of respondents consumed fish less frequently than recommended. Sea fish were mostly consumed less than once a month (31.8%) or 1–3 times a month (30.9%). Most subjects (44.8%) consumed freshwater fish less than once a month. Consumption also depended educational level, economic status, place of residence, declared health status, and BMI value or BMI status. However, taking into account sex, the occurrence of these relationships was different between men and women. It seems that educational activities and dissemination of proper nutrition principles is necessary in order to increase the consumption of fish in Poland. It is important to emphasize the health benefits of fish consumption in relation to the possible adverse effects of their contamination. [ABSTRACT FROM AUTHOR]

Objective: Recently, the South China Sea has been facing a crisis of depleted fishery resources, primarily due to the impacts of illegal, unreported, and unregulated fishing activities, as well as overfishing. Accurately understanding the fishing activity intensity in the South China Sea holds significant implications for the sustainable management of fisheries resources. Methods: Leveraging the automatic identification system trajectory data from 2018, this paper employs spatial statistical methods and fishing effort indicators to comparatively analyze the spatial variations in fishing intensity between Chinese and Vietnamese fishing vessels. Result: The results of this study show that (1) in 2018, the total fishing effort of Chinese fishing vessels in the South China Sea was 7.65 times that of Vietnamese vessels, but during China's South China Sea fishing moratorium, the fishing effort exerted by Vietnamese vessels surpassed that of China and (2) the top 10 ports in China and Vietnam support approximately 30% and 55.13% of their respective fishing intensities in the South China Sea. Conclusion: The study highlights significant variations in fishing intensity between Chinese and Vietnamese vessels and the substantial support provided by major ports. These findings offer valuable insights for fisheries resource monitoring and maritime spatial planning, contributing to the sustainable management of the South China Sea's fisheries resources. Impact statementThis study sheds light on fishing by Chinese and Vietnamese vessels during the South China Sea fishing ban and the intensity of fishing by vessels supported by ports along the South China Sea. By understanding these patterns, we can better manage fishery resources in the South China Sea and ensure sustainable fishing. [ABSTRACT FROM AUTHOR]

Robotic fish will become the next generation of submersibles due to their advantages of high propulsion efficiency, high mobility, excellent environmental compatibility and good load capacity. However, short battery life and high charging costs would be the main obstacles restricting the deployment of robotic fish for long–term ocean monitoring and cruises. The present methods of either using a mother ship or laying cables are very expensive. In order to greatly reduce the cost, a nearby cheap charging station is necessary. In this paper, a comprehensive review of underwater automatic charging methods and systems for robotic fish based on the existing marine renewable energy conversion technology is carried out, including robotic fish underwater docking and charging technology. Based on the review and comparative analysis, a design idea for a novel and feasible system for underwater charging for a school of robotic fish through renewable energy is proposed. [ABSTRACT FROM AUTHOR]

In Lake Kinneret (the biblical Sea of Galilee), Israel, internal waves of significant amplitude are induced by westerly winds. These waves give rise to upwelling into the surface mixed layer of colder, oxygen‐depleted water from the hypolimnetic and metalimnetic layers. If upwelling occurs soon after the onset of annual thermal stratification, when surface mixed layer extends over a narrow depth range, but the hypolimnion is already anoxic, there is a potential for massive fish kills as fish cannot escape the anoxic water that intrudes into the surface mixed layer along the western shore. This study uses a coupled three‐dimensional atmosphere‐lake model to elucidate the mechanisms behind these infrequent major fish kills in Lake Kinneret. Remarkably, nowadays fish‐kill events happen at the same location in the lake where the biblical Miracle of Loaves and Fishes and presumably the Miraculous Catch of Fish occurred two millennia before the present and may explain the appearance of large numbers of easy‐to‐collect fish close to the shore described in the biblical narratives. Key Points: A 3D atmosphere‐lake model elucidated mechanisms for the 2012 fish kill at Lake Kinneret where 'miraculous catches' occurred 2000 years agoUpwelling of low‐oxygen water caused by wind‐driven internal waves was identified as the mechanism for the fish killsFive prerequisite conditions were identified for the fish kill to occur [ABSTRACT FROM AUTHOR]

Copyright of South China Fisheries Science is the property of South China Fisheries Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

AbstractFish and fishing in the Baltic Sea during the Middle Ages is partly known through research on historical records and zooarchaeological materials, and combinations of them. Due to the uneven distribution of written records and research focus, much is known about the large-scale cod and herring fisheries in the southern parts of the Baltic Sea. However, in the northern parts of the Baltic Sea, both large-scale and small local fisheries are less researched. This article considers the species richness, resource availability, and human selection identifiable in these sources. Zooarchaeological material from the Franciscan friary on the island of Kökar in the Åland archipelago will be discussed in relation to zooarchaeological and written sources from the Castle of Kastelholm (Åland). Historical records identify the friary as having taxation rights to large-scale seasonal catches of cod in the outer archipelago; how the friary collected this toll is unclear. It has been assumed, based on the historical records, that cod was the most consumed fish at the site. This study revealed that the zooarchaeological assemblage does not support the interpretation of cod as the most important fish for consumption at the friary during the Medieval Period (AD 1450–1530). [ABSTRACT FROM AUTHOR]

Introduction: We assessed the impact on metal levels of seafood, mollusk and fish consumption (SMFc) before urine and toenail sample donation among workers exposed to metals. Methods: This is a cross-sectional epidemiological study with 101 workers from the chemical and metal industry and 40 unexposed workers from the services sector. We measured urinary (As, Ba, Be, Cd, Co, Cu, Hg, Li, Mo, Pb, Se, Sr, Tl, V, W and Zn) and toenail (same plus Al, Cr, Fe, Mn, Ni and U) metal levels. Results: Urinary arsenic levels were higher among workers eating seafood or mollusks (102 ppm vs. 55.4 ppm; p = 0.042) or fish (109 ppm vs. 48 ppm; p = 0.007) 8 h before sample donation. Urinary mercury was associated with consumption of blue fish (11.865 ppm) and canned sardines (19.125 ppm) (p = 0.028). With respect to toenails, fish consumption was associated with aluminum (17 ppm vs. 8.6 ppm; p = 0.012) and beryllium (5 ppb vs. 1 ppb; p = 0.017). Arsenic urinary levels were associated with numbers of hours prior to sample collection since latest SMFc (p = 0.001). Conclusion: Among workers exposed to metals, seafood, mollusk and fish consumption is an important determinant of urinary arsenic levels, as sea fish for urinary mercury, but not for other metals. [ABSTRACT FROM AUTHOR]

In this study, we estimate the niche overlap between native and invaded ranges of 36 Lessepsian fish, focusing on how this estimate might vary in relation to the temporal resolution of sea surface temperature and salinity, which are the main niche axes determining their distribution. Specifically, we wanted to address the following questions: (i) Does the choice of temporal averaging method of variables influence the estimation of niche overlap for individual variables? (ii) Does this temporal resolution effect persist when conducting bivariate niche estimations?Niches overlap was estimated by calculating two indices and these analyses were repeated at two temporal resolutions, matching observations to the classic 'multidecadal' average of environmental conditions and to the corresponding annual average of records. Results are compared with verify whether differences can be detected in the magnitude of niche commonality measured at annual or multidecadal temporal resolution.The findings show that the temporal resolution of the data significantly influences estimates of overlap in the thermal niche. Specifically, our analysis indicates a considerable disparity between native and invasive niche regions for most species, particularly when evaluated over multidecadal periods compared with matching occurrence data to the annual mean values of years the occurrence was observed, that is matching occurrence data to a common average of 'present' conditions or to the annual mean values of years of observation. In particular, the largest overlaps between native and invaded niches occur along the salinity axis, regardless of temporal resolution. When considering both temperature and salinity together, the results remain unaffected by the temporal resolution of the environmental data. Almost 30% of the species show a different niche in their introduced range, and for the other species, the overlap between native and invaded ranges was reduced with respect to the univariate analyses. [ABSTRACT FROM AUTHOR]

Four new species of the scaleless black dragonfish genus Eustomias are described based on specimens collected during the ABRACOS (Acoustics along the BRAzilian COaSt) expeditions along the Fernando de Noronha Ridge, off northeastern Brazil, western tropical Atlantic. Eustomias (Haploclonus) antea sp. nov. differs from its congeners by having a long chin barbel without appendages, ending in a very small terminal bulb without terminal filaments. Eustomias (Haploclonus) lucenae sp. nov. has the lowest count of photophores in the lateral series (56) and a simple, short barbel, ending in a small and asymmetrical terminal bulb. Eustomias (Nominostomias) ophioglossa sp. nov. differs from its congeners by the long chin barbel with two terminal bulbs and long terminal filament with bifurcated axis along its length and with bulblets of different sizes and arrangements inside. Eustomias (Nominostomias) bertrandi sp. nov. can be distinguished by the long chin barbel with two terminal bulbs, the distal bulb more than twice as long as the proximal one, and a short terminal filament. Morphological description of a specimen identified as Eustomias (Dinematochirus) cf. minimus is provided, and an overview of the species of Eustomias reported in Brazilian waters is presented and discussed. [ABSTRACT FROM AUTHOR]

Copyright of Bylye Gody is the property of Cherkas Global University Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

AbstractThe Ecuadorian site of Salango, with its 5500 years of pre-Columbian history, is of fundamental interest for understanding the relationships between people and the sea on the tropical Pacific coast of South America. In 2015, thousands of fish remains were found in foundational offering deposits of a perimeter wall built to protect a sanctuary of the Middle Guangala phase (AD 300–600). Approximately 3300 bones have been identified, and these represent the remains of 337 individuals belonging to 49 different species. The assemblage is largely dominated by pelagic species, particularly scombrids weighing 2–3 kg. The presence of dolphinfish, a taxon that has not been reported previously in the archaeological record of Salango, supports the hypothesis that fishing was mainly conducted offshore by boat. The preservation in situ of numerous anatomical connections and the large number of remains found virtually intact suggest that these fish were deposited whole. We suggest that these deposits were designed to represent the specific marine environment being exploited from Salango and, more broadly, the sea itself. In this respect, Salango presents an unusual manifestation of pre-Columbian sea-oriented ritual practice so far unique on the Ecuadorian coast. [ABSTRACT FROM AUTHOR]

Clean water is one of the main requirements of the people that utilize the Nizam Zachman Jakarta Ocean Fishing Port (PPSNZJ). The significant demand for water supply at the port has made the management pay more attention to the quantity and quality of clean water provided. The issues related to clean water faced by PPSNZ include complaints from users about the availability and quality of clean water. This study aims to calculate the demand, availability, and criticality index of clean water to support operational activities at Nizam Zachman Fishing Port and to assess the quality of clean water used at the port. A case study with purposive respondents provides the research methodolog. The data analysis applied both STORET analysis and the water criticality index. The research results indicate that the demand for clean water at PPSNZ is 861,478.1278 m3, the availability of clean water is 885,766.9 m3, and the percentage of clean water criticality at PPSNZ is 103%. This means that the clean water in the PPSNZ area does not experience a water crisis, and it adequately meets the needs of the area's users. The quality of clean water at PPSNZ, based on the STORET calculation, shows good quality with a score of 0, in accordance with the clean water quality standards set by the Minister of Health Regulation No. 492/Menkes/Per/IV/2010 regarding clean water. [ABSTRACT FROM AUTHOR]

Every fishing operation cannot be separated from the management process which is carried out in stages starting from planning, organizing, implementing and controlling so that fishing achievements can be met. Purse seine is a fishing tool that produces the highest fishery production at the Nizam Zachman PPS, Jakarta. Studies regarding the management process of fishing operations are still limited, so it is necessary to conduct studies regarding the management of fishing operations at KM. Mekar Kencana 03 at PPS Nizam Zachman Jakarta. Data collection was carried out by observing fishing activities in KM. Mekar Kencana 03 and interview. The data analysis used is qualitative descriptive analysis. Departure preparations are made 30 minutes before departure. The minimum number of crew members on a ship when fishing at sea is 32 people, including the captain. Supplies are prepared according to the number of crew members. The condition of the ship must be monitored, such as the main engine and axle engine. Ship permit documents must be prepared, fishing gear and ship navigation equipment must also be checked. Supervision of fishing operations is carried out directly by the ship owner who acts as the ship's captain. [ABSTRACT FROM AUTHOR]

The article presents analyses of the dynamics of injuries of the snow crab opilio in catches taken during surveys in 2008–2022, as well as data collected by observers in the fishery for this species in the Russian part of the Barents Sea in 2014–2022. The average proportion of injured crabs in catches taken during research surveys increased from 5–11% in 2008–2010 to 45% in 2022. The increase in the number of injured individuals in catches is higher for large males. The modeling results showed that the increased proportion of injured individuals in the period preceding commercial exploitation is associated with an increase in intrapopulation interactions, while during active commercial exploitation, it is associated with fishing pressure on the population, when some individuals, including crabs injured during capture, are returned to the sea after processing. [ABSTRACT FROM AUTHOR]

Global ornamental fish transportation ranging from hours to days can produce multiple stress factors impact fish health and cause mortality. Clownfish, particularly Amphiprion ocellaris, are among the most traded saltwater ornamental fish. Vibrio includes several pathogenic strains that affect aquatic animals. Consequently, prophylactic treatment of the water or fish is recommended. In this study, six Vibrio strains including V. alginolyticus, V. parahaemolyticus and V. harveyi isolated from sick A. ocellaris and one V. harveyi strain from a sick East Asian fourfinger threadfin (Eleutheronema rhadinum) were tested for their sensitivity to a popular disinfectant, chlorine dioxide (ClO2). The results showed that 0.25 ppm ClO2 effectively suppressed five of the seven tested Vibrio strains for 24 h; however, 0.1 ppm ClO2 is safer for A. ocellaris. Meanwhile, ClO2 2.5 ppm reduced the bacterial counts to below 3.3 × 105 CFU/mL for 24 hours. The LC50 of ClO2 for A. ocellaris was 0.87 ppm at 10 min and 0.72 ppm at 24 h post treatment. Mild changes in water quality, including dissolved oxygen (DO), temperature and pH, were recorded during the trial. More research is necessary to understand the sensitivity of various aquatic animal pathogens to ClO2 and its toxicity to different aquatic animals. [ABSTRACT FROM AUTHOR]

Copyright of Jurnal Ilmu dan Teknologi Kelautan Tropis is the property of IPB University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Life history characteristics of Watases lanternfish Diaphus watasei from a deep sea fishing ground of the East China Sea were studied. Overall, 452 adult individuals with standard length ranging from 91 to 147 mm were collected in the continental slope during 3 years. The growth pattern and hatching date were inferred from otolith microstructure analysis, and the stomach contents were examined to clarify feeding ecology. Three distinct zones of the otolith microstructure were depicted, the numbers of increments in the central and middle zones of the D. watasei otolith are in the lowest level in myctophid species studied. The maximum number of growth increments indicated a short lifespan of 2 years. The spawning time almost lasted throughout the year, and then two cohorts were separated according to the estimated hatching time. The length–weight relationship revealed a negative allometric pattern and significant difference between the two cohorts, and a significant seasonal difference was also detected in somatic growth pattern. A piscivorous habit dominated by Maurolicus muelleri was revealed across sampling seasons and standard length groups. Overall, D. watasei show distinct life history characteristics compared to coinhabiting myctophids, and such characteristics could reduce interspecific competition. [ABSTRACT FROM AUTHOR]

With the unique geography and complex environment, the Northwest Pacific Ocean has nurtured extremely rich fishery resources, becoming a hotspot for global marine biodiversity conservation and fishery management. In order to more effectively identify and investigate the diversity of fish species, a local DNA barcodes database of common fish in Northwest Pacific Ocean was established. Based on the CO I gene sequences of fish, 307 samples of common fish were collected in Northwest Pacific Ocean from June to August 2023. These common fish belonged to 20 genera, 13 families, 7 orders, and 25 fish species. 77.96% of CO I sequences can be compared to high similarity sequences in public database. The average interspecific genetic distance was 0.233, and the average intraspecific genetic distance was 0.003, and the interspecific genetic distance was 77.67 times that of the intraspecific genetic distance, and it could form obvious bar code gap. The phylogenetic tree based on CO I gene sequences showed that fishes of the same genus first clustered into a single branch, then with fishes of the same family, and finally with fish of different families of the same order. In summary, the CO I gene has species specificity and can effectively distinguish common fish species in the Northwest Pacific Ocean. The initial establishment of the DNA barcode database of common fish is conducive to the monitoring and investigation of fish diversity in Northwest Pacific Ocean using environmental DNA technology, providing technical support for biodiversity conservation, resource management, and population dynamic monitoring in Northwest Pacific Ocean. [ABSTRACT FROM AUTHOR]

Lanternfishes are the most abundant species of mesopelagic fish in the ocean, playing an important role in connecting the epipelagic and mesopelagic marine food webs. Due to their global distribution, diel vertical migration, and low trophic position, they may be highly susceptible to ingest microplastics. In this study, Notoscopelus resplendens and Symbolophorus californiensis from the Northwest Pacific Ocean were used to compare and analyze potential interspecific differences in the abundance and physicochemical characteristics of microplastics in their intestines. The results showed that both lanternfish species in Northwest Pacific Ocean exhibited a high detection rate of microplastic pollution. The abundance of microplastics in the intestine of S. californiensis and N. resplendens were (0.83 ± 0.90) items/individual [(6.54 ± 8.33) items/g] and (1.17 ± 1.27) items/individual [(11.33 ± 14.06) items/g], respectively. However, no significant difference was found in abundance and size of microplastics detected in S. californiensis and N. resplendens. The shape was primarily composed of fiber (accounting for ≥80.00%). However, there were variations in the chemical composition of microplastics. Polyethylene terephthalate (PET) accounted for 36.00% and polyacrylamide (PAM) accounted for 24.00% of microplastics found in the intestines of S. californiensis, while cellophane (CP) constituted 54.29% and PET constituted 31.43% of MPs found in the intestines of N. resplendens. The microplastic pollution characteristics of lanternfish species may be influenced by accidental ingestion, nutrient transfer, and the water layers in their habitat. These findings contribute to a better understanding of the current status of microplastic pollution among lanternfish species in the same marine area, providing essential data for further exploration of the ecological effects of microplastics on mesopelagic fish in the ocean. [ABSTRACT FROM AUTHOR]

Alveolar bone formation is important to pay attention to because disturbances in bone formation can cause tooth malposition due to suboptimal jaw development. Pregnant female mice who lack nutrition will impact the fetus's growth and development, including the alveolar bone. One good nutrient to support alveolar bone development is saltwater fish powder nanoparticles. Seafish powder contains calcium and omega 3 for bone development, which has not been explained. This study aims to determine how giving saltwater fish powder nanoparticles to pregnant mice affects fetal mice's alveolar bone osteoblast cells. This study used a post-test-only control group design with 12 pregnant mice. Pregnant mice were divided into 2 groups, namely the group given normal food and the group was given selfish powder nanoparticles. saltwater fish powder nanoparticles and normal feed were given 18 days during pregnancy. To see the development of the alveolar bone in the fetus of mice (mus muscullus), it was done by dissecting the fetus after 18 days of gestation. Alveolar bone development was seen from the number of osteoblasts using hematoxylin-eosin (HE) staining. The results of the Independent T-test test showed a value of p<0.05 (p=0.000) that there was a significant difference in the number of osteoblast cells between study groups. Saltwater fish powder nanoparticles in pregnant mice increased the number of osteoblast cells in the fetal alveolar bone mice. [ABSTRACT FROM AUTHOR]

The impact of ocean warming on fish and fisheries is vigorously debated. Leading theories project limited adaptive capacity of tropical fishes and 14-39% size reductions by 2050 due to mass-scaling limitations of oxygen supply in larger individuals. Using the world's hottest coral reefs in the Persian/Arabian Gulf as a natural laboratory for ocean warming - where species have survived >35.0 °C summer temperatures for over 6000 years and are 14-40% smaller at maximum size compared to cooler locations - we identified two adaptive pathways that enhance survival at elevated temperatures across 10 metabolic and swimming performance metrics. Comparing Lutjanus ehrenbergii and Scolopsis ghanam from reefs both inside and outside the Persian/Arabian Gulf across temperatures of 27.0 °C, 31.5 °C and 35.5 °C, we reveal that these species show a lower-than-expected rise in basal metabolic demands and a right-shifted thermal window, which aids in maintaining oxygen supply and aerobic performance to 35.5 °C. Importantly, our findings challenge traditional oxygen-limitation theories, suggesting a mismatch in energy acquisition and demand as the primary driver of size reductions. Our data support a modified resource-acquisition theory to explain how ocean warming leads to species-specific size reductions and why smaller individuals are evolutionarily favored under elevated temperatures. The impact of ocean warming on fish size structure is debated. Here, the authors test mass scaling of metabolism and swimming performance of fish across different water temperatures and regions, suggesting that resource-acquisition explains size reduction due to ocean warming. [ABSTRACT FROM AUTHOR]

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Marine recreational fishing, a globally popular outdoor activity, has deep cultural roots and ecological implications. This study, conducted between 2021-2022, explores marine recreational fishing practices along the Turkish Black Sea coast. It analyzes fisher numbers and demographics, fishing effort, fishing methods, and species caught and released. Furthermore, the research sheds light on the economic dimensions, emphasizing the substantial contributions of recreational fishing to local economies. Notably, responsible practices, such as catch-and-release initiatives, demonstrate anglers' awareness of conservation efforts. Within the Turkish Black Sea region, an observed 18.5% participation rate among a population of 24.5 million implies the presence of approximately 4.5 million marine recreational fishers. Annually, this translates to nearly 30 million fishing days, accompanied by a total expenditure of 400 million Euros. However, it's imperative to handle these figures cautiously as the timing of the screening survey during the COVID-19 pandemic may have influenced the high participation rate, introducing a potential bias. A detailed examination of a Turkish marine recreational fisher engaged in Black Sea fishing reveals an average annual catch of 16.5 kg of retained fish and 1.2 kg of released fish biomass. When extrapolated to the larger population of 4.5 million fishers, this culminates in a noteworthy landing biomass approaching 74,000 tons. The study unveils that marine recreational fishers in the Turkish Black Sea predominantly target commercially important species, resulting in a retained biomass surpassing commercial landings in 2021. This prompts concerns about potential impacts on crucial commercial fish stocks, underscoring the imperative inclusion of recreational fisheries in stock assessments. The research, providing essential insights into the intricate dynamics of recreational fishing, lays a foundation for well-informed policies and practices that concurrently promote environmental conservation and the continuation of this valued leisure activity. [ABSTRACT FROM AUTHOR]

To understand the spatial temporal distribution characteristics of Illex argentinus caught by trawl fishing vessels in the Southwestern Atlantic Ocean and their relationship with key marine environmental factors, this study analyzed the temporal and spatial changes in the fishing ground center of trawl vessels at the ten-day scale from December 2019 to May 2022, combining Chinese trawl fishing log data marine environmental data with satellite remote sensing marine environmental data. Utilizing the Maxent model, ten-day intervals were used as the temporal scale, and ten marine environmental factors, including sea surface temperature, sea surface height, sea surface salinity, chlorophyll concentration, temperature at 50 m and 100 m depth, and the meridional and zonal velocities of ocean currents were quantitatively analyzed to explore the correlation between the spatial distribution of catch and environmental factors. The study reveals that the trawl fishing grounds for Illex argentinus are divided into southern and northern grounds. The southern grounds first appear near 45°20′ S in December, gradually moving southeastward in February and March. The northern grounds do not appear until April, near 42° S in the high seas. On the ten-day time scale, the central fishing grounds of Illex argentinus show significant spatial variability but minor interannual differences. The Maxent model results indicate that sea surface temperature and chlorophyll a concentration are the key environmental factors influencing the spatial and temporal variability of the high seas trawl fishing grounds for most of the time, with high environmental contribution rates during the fishing season. While the range of suitable habitats with an HSI > 0.6 identified by the Maxent model varies significantly between years, a pattern is observed where the range expands at the start and end of the fishing season and contracts during the peak fishing season. This suggests that a more concentrated range of suitable habitats is conducive to accurate predictions of trawl fishing grounds, enabling efficient fishing operations. [ABSTRACT FROM AUTHOR]

In 2021, the Australian government apprehended several Indonesian fishing boats for carrying out their fishing activities on the sea border between Rote Island and Ashmore Reef. This issue was further exacerbated by the growing demand from the traditional leader of the Rotenese community to reassess the status of Ashmore Reef, known as Pulau Pasir, by the Rotenese. The claim could be traced back to the previous attempt in the 2000s, in which they demanded the Australian government restore Ashmore Reef to Pulau Pasir. Collective memory played a significant role in directing the thoughts and decisions made by Rotenese fishermen, as the passing down of the narrative of origin led them to continue their journeys and activities in the islet. In a struggle to preserve their tradition, however, the fishermen had reached an inevitable encounter with modern-day policy, as the 1974 Memorandum of Understanding closed the dispute. This article shall elaborate on the encounter between two ways of life that shaped the perception of the Rotenese fishermen within the critical approach from studies on collective memory as their basis of survival. [ABSTRACT FROM AUTHOR]

A primary response of many marine ectotherms to warming is a reduction in body size, to lower the metabolic costs associated with higher temperatures. The impact of such changes on ecosystem dynamics and stability will depend on the resulting changes to community size-structure, but few studies have investigated how temperature affects the relative size of predators and their prey in natural systems. We utilise >3700 prey size measurements from ten Southern Ocean lanternfish species sampled across >10° of latitude to investigate how temperature influences predator-prey size relationships and size-selective feeding. As temperature increased, we show that predators became closer in size to their prey, which was primarily associated with a decline in predator size and an increase in the relative abundance of intermediate-sized prey. The potential implications of these changes include reduced top-down control of prey populations and a reduction in the diversity of predator-prey interactions. Both of these factors could reduce the stability of community dynamics and ecosystem resistance to perturbations under ocean warming. Using prey size measurements from ten Southern Ocean lanternfish species sampled across >10° of latitude, this study shows that higher temperatures were associated with smaller fish and an overall decrease in the size of fish relative to their prey. Ocean warming may therefore alter the diversity and size structuring of trophic interactions, reducing the stability of marine ecosystems. [ABSTRACT FROM AUTHOR]

In many populations of Atlantic salmon, individuals return to rivers months or even a year prior to spawning. This premature arrival in fresh water by far exceeds the time needed for upstream migrations to spawning areas. Leaving the ocean early means forgoing substantial growth and incurring high metabolic costs of fasting in freshwater. Differences in timing of return migration has been shown to have a genetic basis, and different sea age classes return to rivers at different times. Previously suggested explanations regarding the cause for this behaviour have included both environmental factors and life history trade‐offs, but these hypotheses have not been tested. Here, we combine data on marine growth and mortality of Atlantic salmon with the calculations of energetic expenditures of fasting in freshwater to explore how timing of river entry affects the probability of survival and energy recourses available for spawning. Our results show that to maximize the product of survival until spawning and energy available at spawning, multi sea winter fish in general must enter rivers earlier than one sea winter fish. And that for a large range of sea survival rates, the optimum river entry date for multi sea winter fish is as early as possible. This strongly suggests that the phenomena of premature arrival in Atlantic salmon is adaptive behaviour. [ABSTRACT FROM AUTHOR]

Fish is a product that is easily damaged and requires good handling so that the quality of the fish remains good. Implementing good and correct fish handling is necessary to maintain fish's economic value. This research aims to describe the process of handling fish on fishing vessels at the Bitung Ocean Fishing Port (PPS), observing CPIB on fishing vessels to transport at PPS Bitung, calculating the potential risk of quality degradation during the process of handling fish on fishing vessels to transport at PPS Bitung. This research uses the accidental sampling method. The research results show that the flow of fish handling at PPS Bitung starts from the fish being caught and put on hold until the fish is transported using transportation to the Fish Processing Unit (UPI). Implementing Good Fish Handling Practices (CPIB) on fishing vessels at PPS Bitung found 1 major, and 4 minor deviations. Analysis of the risk of mut reduction in fish after carrying out risk mapping found four risk categories: 6 high, 3 medium, and 1 low. [ABSTRACT FROM AUTHOR]

Marine fishery resources play a crucial role in ensuring food safety, promoting economic development, and maintaining ecosystem stability. The scientific management and sustainable utilization of offshore marine fishery resources are crucial for promoting harmonious economic and environmental development. To explore the changes in the structure and quality of China's offshore marine fishery resources, this study investigated the relationship between human fishing activities, sea surface temperature (SST) changes, Mean Trophic Level (MTL), and Fishing-in-Balance Index (FIB) of the catch in each of the Chinese offshore fishing zones (Bohai Sea and Yellow Sea, East China Sea, and South China Sea) from 1990 to 2020. The study aimed to analyze the impact of human fishing activities and SST changes on the structure and quality of marine fishery resources and the health of fishery ecosystems in offshore China. The results indicated that during the 30 years of the experimental period, human overfishing led to a gradual dominance of low-trophic fish species in the fishery resource structure of the Bohai Sea and Yellow Sea as well as East China Sea fishing zones, resulting in a significant decrease in the quality of fishery resources, but with little impact on the South China Sea. In terms of climate change impact, the rapid SST warming in the Bohai Sea and Yellow Sea fishing zone from May to June inhibited the growth of high-trophic-level fish, and also exacerbated the trend of declining fishery resource quality and structural changes towards low-trophic-level fish. The autumn warming trend in the East China Sea fishing zone had a certain contribution to its quality decline and structural changes towards low-trophic- level fish, but in the South China Sea, the overall SST increase had negligible impacts. Human fishing activities had a minimal impact on the health of China's offshore fishery ecosystem, mainly due to the balance effect of increased catch. SST changes had a relatively small impact on the health of the fishing ecosystem in the Bohai, Yellow, and East China Seas. However, in the South China Sea, the SST warming in autumn was beneficial for the healthy development of its fishing ecosystem. Based on the research results, this study proposes relevant suggestions to improve the structure and quality of fishery resources in various fishing zones, enhance the health of fishery ecosystems, and provide management reference for the sustainable utilization of marine fishery resources in China's offshore fishing zones. [ABSTRACT FROM AUTHOR]

Metal mining is associated with negative social, political, economic, health, and environmental impacts. These individual impacts are generally understood, but a deeper understanding of the combined syndemic effects of mining, particularly in Indigenous communities, is needed, especially as metal mining is expected to grow with the expansion of cleaner energy technologies. Perceptions of environmental risk and human health in Ch'orti' communities of Olopa, Guatemala, that have been impacted by the Cantera Los Manantiales antimony mine were examined via a community-based participatory research approach that included participatory mapping, interviews, and community mapping workshops. Results indicate increased violence and community divisions, increased incidence of health concerns, and an extensive loss of crops and domesticated animals following the introduction of mining operations. Furthermore, participants attributed both water and air contamination to the mine. We argue that our collective results present as a syndemic and represent a continuation of violence toward Indigenous people. Findings will support local leaders and allied research and legal organizations in efforts to effectively access justice and assess health in Indigenous communities impacted by the mine in Olopa. More broadly, this effort demonstrates how participatory mapping methods add nuance to the understanding of syndemics and other environmental health risks. [ABSTRACT FROM AUTHOR]

Fish maintained in managed care may have longer lifespans as a result of advances in veterinary medicine and husbandry and reduced risk of predation. Neoplasia is of increasing interest in managed aquarium populations. However, few studies have systematically evaluated neoplasia in managed fish populations. Our objective in this retrospective study was to review and describe neoplasia diagnosed in fish at a large public display aquarium between 2005 and 2021. Any fish diagnosed with neoplasia on either antemortem or postmortem evaluation during the study period was included, and all medical records, biopsy, and autopsy reports were reviewed. Sixty-two fish met the inclusion criteria; 37 species were included in the study population, most of which were tropical freshwater fish (n = 34 fish). Thirty-two types of neoplasia were identified. Ten fish had benign neoplasms, and 53 fish had malignant neoplasms. The most common neoplasms were of epithelial and neuroectodermal origin. The most common site of tumor origin was the skin. Our data suggest that mesenchymal neoplasms may be more common in cold saltwater fish than in tropical freshwater and saltwater fish. Malignant neoplasms were most commonly diagnosed in the study population and should be a top differential when neoplasms are identified in fish managed under human care. Our study contributes to the overall knowledge of the health of aquarium fish and may aid clinicians in characterizing neoplasia that may be present in fish under human care. [ABSTRACT FROM AUTHOR]

Published information about fish botulism is scant. We review here the current literature on fish botulism. Freshwater fish are susceptible to botulism. Only anecdotal evidence exists about possible botulism cases in saltwater fish. With only a few exceptions, the etiology of all cases of fish botulism reported is Clostridium botulinum type E, although fish are sensitive to, and may carry, various C. botulinum types. Clinical signs of botulism in fish include loss of equilibrium and motion, abducted opercula, open mouths, dark pigmentation, and head up/tail down orientation in which attempts to swim result in breaching the surface of the water. Dark pigmentation is thought to be associated with acetylcholine imbalance in botulinum neurotoxin (BoNT)-affected fish. Rarely, but similar to the situation in other animal species, fish can recover from botulism. Fish botulism can cause secondary outbreaks of the disease in birds, as botulism-affected fish stand out from normal fish, and are selectively preyed upon by fish-eating birds, which thus become intoxicated by the BoNT present in sick fish. The source of BoNT in fish has not been definitively confirmed. Fish may ingest C. botulinum spores that then germinate in their digestive tract, but the possibility that fish ingest preformed BoNT from the environment (e.g., dead fish, shellfish, insects) cannot be ruled out. The presumptive diagnosis of botulism in fish is established based on clinical signs, and as in other species, confirmation should be based on detection of BoNT in intestinal content, liver, and/or serum of affected fish. [ABSTRACT FROM AUTHOR]

Viral nervous necrosis (viral encephalopathy and retinopathy) is caused by piscine nodavirus (Nodaviridae, Betanodavirus). Since 1986, this highly infectious virus has caused mass mortalities of up to 100% in farmed saltwater and freshwater fish around the world (with the exception of South America and Antarctica), affecting >60 species across 10 orders. The Atlantic blue marlin (Makaira nigricans Lacépède, 1802) is a top-level predator found throughout the tropical waters of the Atlantic and Indo-Pacific oceans. Despite their popularity as a sportfish, relatively little is known about the Atlantic blue marlin and other billfish. We describe here chronic betanodavirus infection in a juvenile Atlantic blue marlin, which is, to our knowledge, the first report of disease in M. nigricans. [ABSTRACT FROM AUTHOR]

Myctophid fishes represent an important trophic link between zooplankton and higher trophic level predators in the oceanic ecosystems of the Southern Ocean. The Antarctic lanternfish (Electrona antarctica) is one of the most abundant myctophids in the Southern Ocean; however, information on their feeding habits is sparse, representing a key area of uncertainty in efforts to model Southern Ocean food web dynamics. Using a classification tree approach based on stomach content data, we explored the feeding strategy of E. antarctica in the Amundsen and Cosmonaut Seas during January and March 2021, as well as its variation in relation to ontogenetic stage and sampling area. An ontogenetic shift in the feeding preference of E. antarctica was identified in the Cosmonaut Sea: Fish smaller than 48 mm fed on ostracods and copepods, while larger fish (SL > 62 mm) relied primarily on krill. Conversely, there was no ontogenetic shift in the diet of E. antarctica in the Amundsen Sea, and this species feeds almost exclusively on Themisto gaudichaudii. The diet composition of E. antarctica presented spatial differences: Copepods (48% IRI) and krill (24% IRI) were consumed more in the Cosmonaut Sea, while amphipods (91% IRI) were consumed more in the Amundsen Sea. The spatial differences in the prey of E. antarctica are related to the oceanographic environment and the variety of plankton prey in different regions. We determined that the size of E. antarctica, sea surface temperature (SST), latitude, and chlorophyll-a concentration (Chl) were the most important variables associated with dietary differences. When the fish size is larger than 55 mm and the krill abundance is high, E. antarctica mainly preys on krill. Since E. antarctica occupies a key position in the mesopelagic fish community, increased knowledge of the trophic ecology of this fish would contribute to a comprehensive understanding of its response to environmental changes. [ABSTRACT FROM AUTHOR]

The research aims to analyze the causes and course of the diplomatic crisis between Brazil and France in 1961-1963, which went down in history under the name «lobster war» and was provoked by a dispute between Brazilian and French fishermen for the possibility of lobster fishing in the Atlantic Ocean off the coast of Brazil. The following methods were used to achieve the research goal: analysis and synthesis, generalization, induction, and deduction It has been noted that the «lobster war» demonstrates how a conflict between fishermen of two countries can develop into a diplomatic crisis, and later into a territorial dispute and become an international problem. The author agrees with the thesis that based on the results of the events of the «lobster war» it is impossible to determine which of the two sides emerged victorious: for Brazil, on the one hand, the «lobster war» went down in history as a moment of national pride and prestige, and on the other, the «lobster war» showed the deplorable condition of the Brazilian Navy (obsolete fleet, defective ships, lack of reserves, shortage of ammunition); for France, whose society was not so involved in the course and causes of the «lobster war», it affected only a narrow group of entrepreneurs who were involved in catching crustaceans, and at the same time demonstrated France’s willingness to defend the economic interests of its citizens. It is noted that the «lobster war» played an important role in the creation of the UN Convention on the Law of the Sea. [ABSTRACT FROM AUTHOR]