31 results on '"Ferreri, Rosalia"'
Search Results
2. Automatic classification of acoustically detected krill aggregations: A case study from Southern Ocean
- Author
-
Fontana, Ignazio, Barra, Marco, Bonanno, Angelo, Giacalone, Giovanni, Rizzo, Riccardo, Mangoni, Olga, Genovese, Simona, Basilone, Gualtiero, Ferreri, Rosalia, Mazzola, Salvatore, Lo Bosco, Giosué, and Aronica, Salvatore
- Published
- 2022
- Full Text
- View/download PDF
3. Fourier-transform near-infrared spectroscopy first application to age determination in European fish species: the case of the Atlantic horse mackerel from the central Mediterranean Sea.
- Author
-
Basilone, Gualtiero, Lo Cicero, Gabriella, Fortuna, Miryam, Luviner, Anita, Ferreri, Rosalia, Aronica, Salvatore, Genovese, Simona, Giacalone, Giovanni, Fontana, Ignazio, and Bonanno, Angelo
- Subjects
NEAR infrared spectroscopy ,MACKERELS ,ABSORPTION spectra ,AGE ,MARINE organisms - Abstract
Fourier-transform near-infrared spectroscopy (FT-NIRS) has recently been used to reduce the processing time for estimates of annual age in several fish species. The present study represents the first application of this technique to marine organisms from the European waters. Atlantic horse mackerel (Trachurus trachurus) from the central Mediterranean Sea was selected for its ecological role, its socioeconomic value, and because its age is regularly estimated by otolith reading under a stereomicroscope for stock assessment purposes. Absorption spectra of the whole otoliths were acquired by FT-NIRS across a multiyear dataset, obtained during acoustic surveys carried out in different regions of the central Mediterranean Sea. The acquired spectra were processed to optimize calibration models to predict age. The best linear models obtained by the optimizing procedure predicted age successfully with a coefficient of determination of 0.95-0.96, mean squared error of 0.5 years, and bias <0.03 years. Although regional calibration models were also obtained separately, the models with all regions combined appeared much more robust and encompassing the whole age range, suggesting its usefulness for the entire spatial distribution range considered in the preset study. The use of FT-NIRS allowed to successfully predict age for horsemackerel between the ages 1 and 14, with similar or better precision (and bias) of the traditional methods, also increasing the standardization by repeatability of age assignments. The preliminary results obtained by this study encourage further effort to fine-tune the calibration model for new species, in order to apply a precise, rapid, costeffective method for stock assessment purposes of Mediterranean fish resources. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Vertical structure characterization of acoustically detected zooplankton aggregation: a case study from the Ross Sea
- Author
-
Barra, Marco, primary, Guglielmo, Letterio, additional, Bonanno, Angelo, additional, Mangoni, Olga, additional, Rivaro, Paola, additional, Rumolo, Paola, additional, Falco, Pierpaolo, additional, Basilone, Gualtiero, additional, Fontana, Ignazio, additional, Ferreri, Rosalia, additional, Giacalone, Giovanni, additional, Aronica, Salvatore, additional, Minutoli, Roberta, additional, Memmola, Francesco, additional, Granata, Antonia, additional, and Genovese, Simona, additional
- Published
- 2023
- Full Text
- View/download PDF
5. Growth variability in Atlantic horse mackerel Trachurus trachurus (Linneus, 1758) across the central Mediterranean Sea: contrasting latitudinal gradient and different ecosystems
- Author
-
Basilone, Gualtiero, primary, Ferreri, Rosalia, additional, Aronica, Salvatore, additional, Bonanno, Angelo, additional, Genovese, Simona, additional, Rumolo, Paola, additional, Carbonara, Pierluigi, additional, and Barra, Marco, additional
- Published
- 2023
- Full Text
- View/download PDF
6. First annulus formation in the European anchovy; a two-stage approach for robust validation
- Author
-
Basilone, Gualtiero, Barra, Marco, Ferreri, Rosalia, Mangano, Salvatore, Pulizzi, Maurizio, Giacalone, Giovanni, Fontana, Ignazio, Aronica, Salvatore, Gargano, Antonella, Rumolo, Paola, Genovese, Simona, and Bonanno, Angelo
- Published
- 2020
- Full Text
- View/download PDF
7. Trophic relationships between anchovy (Engraulis encrasicolus) and zooplankton in the Strait of Sicily (Central Mediterranean sea): a stable isotope approach
- Author
-
Rumolo, Paola, Fanelli, Emanuela, Barra, Marco, Basilone, Gualtiero, Genovese, Simona, Gherardi, Serena, Ferreri, Rosalia, Gargano, Antonella, Mazzola, Salvatore, and Bonanno, Angelo
- Published
- 2018
- Full Text
- View/download PDF
8. Age and Growth of European Sardine (Sardina pilchardus) in the Central Mediterranean Sea: Implication for Stock Assessment
- Author
-
Basilone, Gualtiero, primary, Ferreri, Rosalia, additional, Bonanno, Angelo, additional, Genovese, Simona, additional, Barra, Marco, additional, and Aronica, Salvatore, additional
- Published
- 2023
- Full Text
- View/download PDF
9. A Morphometric Approach to Understand Prokaryoplankton: A Study in the Sicily Channel (Central Mediterranean Sea)
- Author
-
Maimone, Giovanna, primary, Azzaro, Maurizio, additional, Placenti, Francesco, additional, Paranhos, Rodolfo, additional, Cabral, Anderson Sousa, additional, Decembrini, Franco, additional, Zaccone, Renata, additional, Cosenza, Alessandro, additional, Rappazzo, Alessandro Ciro, additional, Patti, Bernardo, additional, Basilone, Gualtiero, additional, Cuttitta, Angela, additional, Ferreri, Rosalia, additional, Aronica, Salvatore, additional, and Ferla, Rosabruna La, additional
- Published
- 2023
- Full Text
- View/download PDF
10. First description of the shelf epipelagic plankton layers at a Mediterranean basin-scale
- Author
-
Ventero, Ana, Iglesias, Magdalena, Giannoulaki, Marianna, Pyrounaki, Maria Myrto, Leonori, Iole, De Felice, Andrea, Tičina, Vjekoslav, Saraux, Claire, Genovese, Simona, Baeza, Josep, Córdoba, Pilar, Kapelonis, Zacharias, Somarakis, Stylianos, Hattab, Tarek, Biagiotti, Ilaria, Malavolti, Sara, Juretić, Tea, Bourdeix, Jean-herve, Basilone, Gualtiero, Ferreri, Rosalia, Aronica, Salvatore, Ventero, Ana, Iglesias, Magdalena, Giannoulaki, Marianna, Pyrounaki, Maria Myrto, Leonori, Iole, De Felice, Andrea, Tičina, Vjekoslav, Saraux, Claire, Genovese, Simona, Baeza, Josep, Córdoba, Pilar, Kapelonis, Zacharias, Somarakis, Stylianos, Hattab, Tarek, Biagiotti, Ilaria, Malavolti, Sara, Juretić, Tea, Bourdeix, Jean-herve, Basilone, Gualtiero, Ferreri, Rosalia, and Aronica, Salvatore
- Abstract
This research represents the first approach to the study of the shelf zooplankton community at a Mediterranean scale, using acoustic standardized data collected in June-July in 10 different geographical sub-areas (GSAs) established by the General Fisheries Commission for the Mediterranean (GFCM) within the framework of the MEDiterranean International Acoustic Survey (MEDIAS). The analysis of the zooplankton layers based on their acoustic characteristics has revealed the potential of these surveys for the study of zooplankton at a Mediterranean basin scale and, also, the need to collect biological samples to interpret the acoustic records in terms of species. The fish population’s direct assessment is established in the MEDIAS framework, but the integration of zooplankton community data would constitute a qualitative step for the understanding of the fluctuations of fish populations and therefore to achieve the objective of an ecosystem-based management. Results have revealed the ubiquity of the zooplankton layers and its ability to form layers detectable by scientific echosounders throughout the Mediterranean at the common fish assessment frequency (38 kHz). In addition, the use of two frequencies (38 and 120 kHz) has allowed to apply the dB difference method, observing changes in the difference of the Mean Volume Backscattering Strength (∆MVBS) at 38 and 120 kHz frequencies, which would be related to changes in the composition of the zooplankton community.
- Published
- 2022
- Full Text
- View/download PDF
11. Reproduction and Sexual Maturity of European Sardine (Sardina pilchardus) in the Central Mediterranean Sea
- Author
-
Basilone, Gualtiero, primary, Ferreri, Rosalia, additional, Aronica, Salvatore, additional, Mazzola, Salvatore, additional, Bonanno, Angelo, additional, Gargano, Antonella, additional, Pulizzi, Maurizio, additional, Fontana, Ignazio, additional, Giacalone, Giovanni, additional, Calandrino, Pietro, additional, Genovese, Simona, additional, and Barra, Marco, additional
- Published
- 2021
- Full Text
- View/download PDF
12. Effects of sampling intensity and biomass levels on the precision of acoustic surveys in the Mediterranean Sea
- Author
-
Barra, Marco, Bonanno, Angelo, Hattab, Tarek, Saraux, Claire, Iglesias, Magdalena, Leonori, Iole, Ticina, Vjekoslav, Basilone, Gualtiero, De Felice, Andrea, Ferreri, Rosalia, Machias, Athanassios, Ventero, Ana, Costantini, Ilaria, Juretic, Tea, Pyrounaki, Maria Myrto, Bourdeix, Jean-herve, Gasparevic, Denis, Kapelonis, Zacharias, Canduci, Giovanni, Giannoulaki, Marianna, Barra, Marco, Bonanno, Angelo, Hattab, Tarek, Saraux, Claire, Iglesias, Magdalena, Leonori, Iole, Ticina, Vjekoslav, Basilone, Gualtiero, De Felice, Andrea, Ferreri, Rosalia, Machias, Athanassios, Ventero, Ana, Costantini, Ilaria, Juretic, Tea, Pyrounaki, Maria Myrto, Bourdeix, Jean-herve, Gasparevic, Denis, Kapelonis, Zacharias, Canduci, Giovanni, and Giannoulaki, Marianna
- Abstract
Acoustic surveys represent the standard fishery-independent method worldwide for evaluating the biomass and spatial distribution of small pelagic fish populations. Considering the peculiarities of the spatial behaviour of pelagic fishes, the efficiency of the survey design in determining their biomass and spatial distribution is related to the ability to capture the portion of the patches accounting for a larger part of the total biomass. However, the spatial structure of the patches could be strongly influenced by ecosystem characteristics as well as by changes in total biomass related to a density-dependent mechanism. This is of particular interest for anchovies and sardines, which are known for their wide fluctuations and high sensitivity to the environment. In this study, we analysed the efficiency of acoustic surveys targeting European anchovies (Engraulis encrasicolus) and European sardines (Sardina pilchardus) in 10 different areas of the Mediterranean Sea spanning three years of different biomass levels. Using the geostatistical coefficient of variation (CVgeo) of the average occurrence probability of high/medium density values, we showed different patterns in terms of survey design efficiency among areas and species. Anchovies usually showed a lower CVgeo than sardines in the Alboran Sea. In 4 out of 20 cases, CVgeo values showed a consistent decrease with increasing biomass, while in the remaining cases, the CVgeo did not follow any clear pattern, suggesting the presence of important environmental effects. Higher survey design efficiency was found in highly productive sectors influenced by river run-off, allowing us to hypothesize that higher productivity along with the presence of well-localized enrichment mechanisms could favour a spatially consistent distribution and coherent organization of fish populations, leading to higher precision estimates with a given transect design. While most surveys displayed CVgeo close to 10% or less even at low biomass, i
- Published
- 2021
- Full Text
- View/download PDF
13. Variability in size at maturity of the European anchovy (Engraulis encrasicolus) in the Mediterranean Sea
- Author
-
Ferreri, Rosalia, Genovese, Simona, Barra, Marco, Biagiotti, Ilaria, Bourdeix, Jean-herve, De Felice, Andrea, Gasparevic, Denis, Hattab, Tarek, Iglesias, Magdalena, Juretic, Tea, Leonori, Iole, Malavolti, Sara, St Raykow, Violin, Saraux, Claire, Ticina, Vjekoslav, Ventero, Ana, Basilone, Gualtiero, Ferreri, Rosalia, Genovese, Simona, Barra, Marco, Biagiotti, Ilaria, Bourdeix, Jean-herve, De Felice, Andrea, Gasparevic, Denis, Hattab, Tarek, Iglesias, Magdalena, Juretic, Tea, Leonori, Iole, Malavolti, Sara, St Raykow, Violin, Saraux, Claire, Ticina, Vjekoslav, Ventero, Ana, and Basilone, Gualtiero
- Abstract
Size at first sexual maturity (L50) represents an important life-history trait that needs to be considered in the development of management measures as it provides fundamental information for avoiding the exploitation of younger individuals. L50 is known to display variability due to fishing pressure, geographical gradients, and environmental features. In this study, to investigate L50 variability among areas in the Mediterranean and Black Seas, maturity ogives of anchovies (Engraulis encrasicolus) were estimated by considering samples collected during the anchovy spawning period in the framework of the MEDiterranean International Acoustic Survey (MEDIAS) program. Anchovy size and sexual maturity data from several geographical subareas (GSAs), i.e., northern Spain, Gulf of Lion, Tyrrhenian Sea, Strait of Sicily, Adriatic Sea and Black Sea, were gathered according to a standard methodological protocol. Maturity ogives were estimated by a logistic regression considering total length, condition factor, sex and GSA. The obtained results showed a significant effect of the condition factor, in that fish in better condition reached maturity earlier, and the results also indicated differences in L50 values among the areas and between the sexes, with males reaching maturity at lower lengths than females. Even though the obtained L50 estimates are relative to the spawning period only, the variability observed at the Mediterranean basin scale highlights the importance of explicitly considering specific habitat characteristics when providing management advice based on an ecosystem approach for fisheries.
- Published
- 2021
- Full Text
- View/download PDF
14. Temperature strongly correlates with regional patterns of body size variation in Mediterranean small pelagic fish species
- Author
-
Hattab, Tarek, Gucu, Ali, Ventero, Ana, De Felice, Andrea, Machias, Athanassios, Saraux, Claire, Gašparević, Denis, Basilone, Gualtiero, Costantini, Ilaria, Leonori, Iole, Bourdeix, Jean-herve, Iglesias, Magdalena, Barra, Marco, Giannoulaki, Marianna, Ferreri, Rosalia, El Ayoubi, Salah, Malavolti, Sara, Genovese, Simona, Somarakis, Stelios, Juretić, Tea, Tičina, Vjekoslav, Certain, Gregoire, Hattab, Tarek, Gucu, Ali, Ventero, Ana, De Felice, Andrea, Machias, Athanassios, Saraux, Claire, Gašparević, Denis, Basilone, Gualtiero, Costantini, Ilaria, Leonori, Iole, Bourdeix, Jean-herve, Iglesias, Magdalena, Barra, Marco, Giannoulaki, Marianna, Ferreri, Rosalia, El Ayoubi, Salah, Malavolti, Sara, Genovese, Simona, Somarakis, Stelios, Juretić, Tea, Tičina, Vjekoslav, and Certain, Gregoire
- Abstract
In this study we consider the applicability of Bergmann’s rule to the populations of small pelagic fish species in the Mediterranean Sea. Under Bergmann’s rule, body size increases with decreasing temperature and increasing latitude. Although this macroecological pattern in body sizes is well established for many taxa of endotherms and ectotherms, it does not remain universal, and the proposed mechanisms underlying it are multiple and still lack consensus. Here we explored the occurrence of geographical body size clines using measurements of average body sizes of 10 species collected in pelagic trawl hauls carried out during acoustic surveys in the Mediterranean Sea. Bergmann’s rule was evaluated by correlating body sizes with latitude and temperature for each species while accounting for potential confounding variables and sampling bias. For 5 species, namely anchovy, sardine, Atlantic chub mackerel, bogue and blue jack mackerel, we demonstrate that they follow Bergmann’s rule, with a decline in average body size by about 3.01, 3.43, 3.67, 3.82 and 3.76 % per 1°C of warming, respectively, although this did not translate with an increase in size with latitude. The adherence of these 5 pelagic fish to Bergmann’s rules strongly suggest that temperature is a major determinant of their body sizes and enables them to act as sentinel species for identifying the drivers and consequences of warming in the Mediterranean ecosystems.
- Published
- 2021
- Full Text
- View/download PDF
15. New Evaluation of Postovulatory Follicle Degeneration at High-Temperature Regimes Refines Criteria for the Identification of Spawning Cohorts in the European Anchovy (Engraulis encrasicolus)
- Author
-
Ferreri, Rosalia, primary, Barra, Marco, additional, Gargano, Antonella, additional, Aronica, Salvatore, additional, Bonanno, Angelo, additional, Genovese, Simona, additional, Rumolo, Paola, additional, and Basilone, Gualtiero, additional
- Published
- 2021
- Full Text
- View/download PDF
16. Effects of habitat conditions at hatching time on growth history of offspring European anchovy, Engraulis encrasicolus, in the Central Mediterranean Sea
- Author
-
Basilone, Gualtiero, primary, Ferreri, Rosalia, additional, Mangano, Salvatore, additional, Pulizzi, Maurizio, additional, Gargano, Antonella, additional, Barra, Marco, additional, Mazzola, Salvatore, additional, Fontana, Ignazio, additional, Giacalone, Giovanni, additional, Genovese, Simona, additional, Aronica, Salvatore, additional, and Bonanno, Angelo, additional
- Published
- 2018
- Full Text
- View/download PDF
17. Spatio-temporal patterns and environmental controls of small pelagic fish body condition from contrasted Mediterranean areas
- Author
-
Brosset, Pablo, Fromentin, Jean-marc, Van Beveren, Elisabeth, Lloret, Josep, Marques, Virginie, Basilone, Gualtiero, Bonanno, Angelo, Carpi, Piera, Donato, Fortunata, Kec, Vanja Cikes, De Felice, Andrea, Ferreri, Rosalia, Gasparevic, Denis, Giraldez, Ana, Gucu, Ali, Iglesias, Magdalena, Leonori, Iole, Palomera, Isabel, Somarakis, Stylianos, Ticina, Vjekoslav, Torres, Pedro, Ventero, Ana, Zorica, Barbara, Menard, Frederic, Saraux, Claire, Brosset, Pablo, Fromentin, Jean-marc, Van Beveren, Elisabeth, Lloret, Josep, Marques, Virginie, Basilone, Gualtiero, Bonanno, Angelo, Carpi, Piera, Donato, Fortunata, Kec, Vanja Cikes, De Felice, Andrea, Ferreri, Rosalia, Gasparevic, Denis, Giraldez, Ana, Gucu, Ali, Iglesias, Magdalena, Leonori, Iole, Palomera, Isabel, Somarakis, Stylianos, Ticina, Vjekoslav, Torres, Pedro, Ventero, Ana, Zorica, Barbara, Menard, Frederic, and Saraux, Claire
- Abstract
Small pelagic fish are among the most ecologically and economically important marine fish species and are characterized by large fluctuations all over the world. In the Mediterranean Sea, low catches and biomass of anchovies and sardines have been described in some areas during the last decade, resulting in important fisheries crises. Therefore, we studied anchovy and sardine body condition variability, a key index of population health and its response to environmental and anthropogenic changes. Wide temporal and spatial patterns were investigated by analyzing separately data from scientific surveys and fisheries in eight Mediterranean areas between 1975 and 2015. Results showed that anchovy and sardine body condition as well as maximum size in some areas sharply decreased in most Mediterranean areas along years (except in the Northern Alboran Sea). Despite this general pattern, well-marked environmental differences between sub-regions were highlighted by several analyses and variations in body condition were not found to be homogeneous over all the Mediterranean Sea. Further, other analyses revealed that except for the Adriatic where major changes towards a lower body condition were concomitant with a decrease in river runoffs and chl-a concentration, no concomitant environmental regime shift was detected in other areas. Together, these analyses highlighted the current poor body condition of almost all small pelagic fish populations in the Mediterranean. Yet, global environmental indices could not explain the observed changes and the general decrease in condition might more likely come from regional environmental and/or anthropogenic (fishing) effects. A prolonged state of poor fish body condition, together with an observed reduced size and early age-at-maturity may have strong ecological, economic and social consequences all around the Mediterranean Sea.
- Published
- 2017
- Full Text
- View/download PDF
18. Fluid escape structures revealing volcanic and tectonic activity in the Graham Bank (Sicily Channel)
- Author
-
Spatola, Daniele, Sulli, Attilio, Micallef, Aaron, Basilone, Luca, Pennino, Valentina, Interbartolo, Francesco, Basilone, Gualtiero, Bonanno, Angelo, Ferreri, Rosalia, Genovese, Simona, and Pulizzi, Maurizio
- Subjects
Neotectonics -- Italy -- Sicily ,Volcanic eruptions -- Italy -- Sicily ,Geomorphology -- Research - Abstract
The Graham Bank (NW Sicily Channel, Central Mediterranean) is characterised by a complex seafloor morphology, where morphostructural highs, submarine plain, escarpments, and negative and positive relieves indicate a complex structural setting and the occurrence of seepage fluids. New high-resolution acoustic data (multibeam, Chirp profiles) and multi-channel profiles, allowed us to differentiate two main morphological sectors, and to identify several pockmarks and mounds linked to fluid escape phenomena. The eastern sector, corresponding to the volcanic edifices of the Graham Bank, is characterised by volcanic context with rough morphology, several mounds, focused seepage plumes and magmatic acoustic substrate, all related to the activity forming both the Graham Bank and the new volcanic cones here identified. The western sector displays a generally flat morphology dominated by Late Pleistocene-Holocene outer shelf deposits, where mounds and pockmarks with sub-circular and ellipsoidal shapes, V- to U-shaped in cross-section, are the prevailing features indicating the migration of fluids to the seafloor. These two areas are separated by a vertical deep fault forming a deeply incised channel with NW-SE direction. The latter is bordered by steep walls forming fault escarpments, which shed the eroded materials to the adjacent lower slope and deep-water zones. The overall morphostructural setting suggests a tectonic control in the morphological conformation of the seabed and in the distribution of both pockmarks and mounds. The aligned mounds have both NW-SE and NNW-SSE orientation, sometimes extending several hundred metres and forming hummocky surfaces. The aligned pockmarks are strictly comparable to the orientation of the faults related to the most recent tectonic activity. The good correlation between fluid escape structures and the main fault systems involving the kilometric sedimentary cover suggests that the degassing of fluids is rooted in depth revealing that extensional tectonics acts with very deep subvertical recent faults developing along and reactivating the Cenozoic (both Plio-Quaternary and Messinian) and Mesozoic tectonic systems., peer-reviewed
- Published
- 2016
19. Trophic relationships between anchovy (Engraulis encrasicolus) and zooplankton in the Strait of Sicily (Central Mediterranean sea): a stable isotope approach
- Author
-
Rumolo, Paola, primary, Fanelli, Emanuela, additional, Barra, Marco, additional, Basilone, Gualtiero, additional, Genovese, Simona, additional, Gherardi, Serena, additional, Ferreri, Rosalia, additional, Gargano, Antonella, additional, Mazzola, Salvatore, additional, and Bonanno, Angelo, additional
- Published
- 2017
- Full Text
- View/download PDF
20. Spatio-temporal dynamics of a planktonic system and chlorophyll distribution in a 2D spatial domain: matching model and data
- Author
-
Valenti, Davide, primary, Denaro, Giovanni, additional, Ferreri, Rosalia, additional, Genovese, Simona, additional, Aronica, Salvatore, additional, Mazzola, Salvatore, additional, Bonanno, Angelo, additional, Basilone, Gualtiero, additional, and Spagnolo, Bernardo, additional
- Published
- 2017
- Full Text
- View/download PDF
21. Report of the Workshop for maturity staging chairs (WKMATCH), 11–15 June 2012, Split, Croatia
- Author
-
Saborido-Rey, Fran, Basilone, Gualtiero, Belcari, P., Ferreri, Rosalia, Kec, Vanja, Kjesbu, Olav S., Korta, María, Nash, Richard D. M., Villamor, Begoña, and Zorica, Barbara
- Abstract
59 páginas, 8 anexos, The recorded maturity stage at the time of observation is an important biological parameter to be used in the calculation of maturity ogives (and therefore of Spawning Stock Biomass), for the definition of the spawning season of a species, for the moni-toring of long-term changes in the spawning cycle, and for many other research needs regarding the biology of species. Thus, maturity data are fundamental part of the stock assessment process and hence a vast effort is put on validating the macro-scopic inspection of gonads. In the last decade a series of workshops addressed the maturity staging of different species with the objective of developing common ma-turity scales, decreasing discrepancies between laboratories and validating maturity staging through microscopic evaluation. A total of 11 of those workshops on species-specific maturity staging were revised here. These workshops have analysed 20 teleosts, elasmobranchs as a whole subclass, three orders of cephalopods and four crustacean species. The WKMAT 2007, and later WKMSCWHS 2007, proposed a six point maturity scale for both males and fe-males that have been used as a reference in the different maturity workshops to de-velop and adopt a common scale between laboratories for each species. A notable effort has been made by all workshop participants to standardize the existing maturi-ty scales and accommodate the standard scale proposed. All workshops acknowl-edged the biological differences between the reference scale stages. All workshops proposed new scales that although were generally consistent with WKMAT scale, showed several differences. As a result, the four stage scale proposed in WKMAT has generally not adopted, partially because such scale does not allow reflecting specific particularities, useful for a number of species., To overcome this, we propose the use a single scale of 4+2 stages or divisions which is believed to be universal, that is, it can be used for the majority of species, although viviparous and hermaphrodites may need some adaptation. This 6 stage codes and names should be used for all species and both sexes without exception; species-specific particularities should be reflected creating subdivisions and never modifying the 6 main stages. Using this proposed coding system, particularities of species and stocks can be addressed by each workshop (subdivisions), without losing consistency and traceability (divisions). In this way the code number of the divisions or main stages has the same biological meaning across species and laboratories. Some poten-tial subdivisions are proposed as well, for its facultative use in some batch spawners an in viviparous species. The merging of different stages should be avoided and in-stead a combined code should be used. In this manner the consistency of stages defi-nition and codes is maintained across species. The definition of each stage needs to be linked to biological phases and incorporate into its description species-specific aspects relevant for an easy identification of each stage. The use of the terminology for maturity stages considers a general scheme of the reproduction that can be applied to all male and female elasmobranchs and tele-ost fishes, including hermaphrodites and livebearers. A full glossary of terminology was compiled. Training (of the observers) is the major issue for maturity staging, and it should be strengthen within the umbrella of ICES., When staging maturity macroscopically timing of the sampling is critical to obtain reliable results. To define this period it is important to know the timing of the repro-ductive cycle, as this is species specific. If maturity staging outside the optimal peri-ods is required, this should be based on histological information. However, we suggest that whole mounts preparations are useful to validate macroscopic staging of ovaries being particularly useful to separate between early developing and develop-ing specimens, immature and regressing/regenerating specimens, or even specimens that have just completed a spawning season from those have not yet entered sexual maturity. Nevertheless, it is recommended that the whole-mounts method is careful-ly calibrated before taken into practical use. The maturity Workshops should discuss the new and general scale in their respective WKs by e-mail to assess the correspondence with the agreed scale, and evaluate the uncertainties and the problems this new general scale may cause. At the same time, ICES should ensure an appropriate attendance and a required level of basic knowledge, both on maturity studies and on the species targeted by the Workshop. Beyond of experts in the matter, the participants should be trained people, this can be achieved by training courses in ICES. We have revised and updated the Guidelines for Workshops on Maturity Staging, and provided general recommendations for future workshops., We reviewed a total of 148 stocks of 53 species from 8 ecoregions from which ICES provides some type of advice. In 88 stocks (59%) maturity data are not used or are used improperly. This includes the use of time invariant maturity ogives when annu-al ogives can be available. In 39 stocks (26%) the assessment uses a proper maturity ogive, but over a limited time period. Finally in only 21 stocks 14% of the total ad-vised stocks the maturity ogive has been estimated on regular basis and in these cases they are used properly in the assessment. Therefore, lack of data and/or poor quality is the main causes of maturity not being used. However, there is a general lack of information in the reports on how the maturity data was collected, ogive estimated, quality control and other relevant information. There is a need to determine what maturity data are required for assessment purposes, including how phenomena such as skipping spawning should be included in assessments. In spite of the effort on collecting maturity data, almost in 100% of the cases sex-specific ogives are combined without analysing the impact of this. Expert groups should provide comprehensive reports on how the maturity data is used, and more specifically, at least: the method used to estimate maturity, in which sex and how a sex-specific maturity ogive is used in the assessment, source of data (survey, commercial sampling), the time of the year when the sampling was conduct-ed, and years of proper estimation. The impact on the assessment of combining sex-specific maturity ogives should be analysed.
- Published
- 2014
22. Yolked Oocyte Dynamics Support Agreement between Determinate- and Indeterminate-Method Estimates of Annual Fecundity for a Northeastern United States Population of American Shad
- Author
-
McBride, Richard S., primary, Ferreri, Rosalia, additional, Towle, Emilee K., additional, Boucher, Jason M., additional, and Basilone, Gualtiero, additional
- Published
- 2016
- Full Text
- View/download PDF
23. Reproductive strategy and fecundity of meagre Argyrosomus regius Asso, 1801 (Pisces: Sciaenidae): implications for restocking programs
- Author
-
Gil, María Del Mar, Grau, Amalia, Basilone, Gualtiero, Ferreri, Rosalia, Palmer, Miguel, and This work has been funded by the Plan Nacional de Cría de Corvina 2005-2007 (JACUMAR MAPA-CC.AA.) and by the INIA projects RTA-2007 00033-C02-01 and RTA-2011 00056-C02-00
- Subjects
Argyrosomus regius ,talla de madurez ,edad de madurez ,época reproductiva ,fecundidad potencial ,mar Mediterráneo ,length at maturity ,age at maturity ,reproductive season ,potential fecundity ,Mediterranean Sea - Abstract
Because the meagre (Argyrosomus regius) is not currently found around the Balearic Islands (western Mediterranean), the Balearic government is carrying out a restocking programme to recover its population. The success of this programme is critically dependent on improved knowledge of the meagre’s life cycle, and particularly its reproductive biology. Data on key reproductive parameters based on both reared and wild specimens are reported here. Histological examinations and gonadosomatic indices from 342 reared specimens demonstrated that 1) the potential reproductive season ranged from April to June and peaked in May, and 2) length at maturity (L50) was 49.3 cm for males and 57.2 cm for females, age at maturity (A50) was 2.7 years for males and 3.5 years for females, and weight at maturity (W50) was 1396 g for males and 1892 g for females. Histological examinations of 37 wild fish from Cádiz (SW Spain) demonstrated that the meagre has determinate fecundity. The annual potential fecundity of reared females ranged from 0.9 to 4.2 million oocytes, which is exponentially dependent upon female size., La corvina (Argyrosomus regius) actualmente no se encuentra en las Islas Baleares (Mediterráneo Occidental) y, por tanto, se están realizando esfuerzos para recuperar su población a través de un programa de repoblación que se está llevando a cabo por el Gobierno Balear. El éxito del programa de recuperación depende fundamentalmente de la mejora de los conocimientos del ciclo de vida de la corvina, y en particular de su biología reproductiva. Este estudio presenta datos sobre los principales parámetros reproductivos de la especie, basándose tanto en ejemplares criados en cautividad como salvajes. Los exámenes histológicos e índices gonadosomáticos de 342 especímenes criados en cautividad demostraron lo siguiente: 1) la potencial época de puesta se extendió de abril a junio y alcanzó su punto máximo en mayo, y 2) la talla de madurez (L50) fue de 49.3 cm para los machos y 57.2 cm para las hembras, la edad de madurez (A50) fue de 2.7 años para los machos y 3.5 años para las hembras, y el peso de madurez (W 50) fue de 1396 g para los machos y 1892 g para las hembras. Los exámenes histológicos de 37 peces salvajes procedentes de Cádiz (SO de España) demostraron que la corvina tiene fecundidad determinada. La fecundidad potencial anual de las hembras criadas en cautividad, la cual está exponencialmente relacionada con el tamaño de la hembra, osciló entre 0.9 y 4.2 millones de ovocitos.
- Published
- 2013
- Full Text
- View/download PDF
24. Seasonal variation of reproductive traits of the caramote prawn in the Gulf of Tunis
- Author
-
Jaziri, Hela, primary, Ferreri, Rosalia, additional, Khoufi, Widien, additional, El Fehri, Safouene, additional, Ben Meriem, Sadok, additional, Pulizzi, Maurizio, additional, Mangano, Salvatore, additional, Bonanno, Angelo, additional, Mazzola, Salvatore, additional, and Basilone, Gualtiero, additional
- Published
- 2015
- Full Text
- View/download PDF
25. Ageing of postovulatory follicles in anchovy (engraulis encrasicolus) by means of DEPM survey data in the Strait of Sicily: a critical review
- Author
-
Basilone, Gualtiero, Ferreri, Rosalia, Fontana, Ignazio, Giacalone, Giovanni, and Saborido-Rey, Fran
- Abstract
5 páginas, 1 tabla, 1 figura
- Published
- 2010
26. Habitat Selection Response of Small Pelagic Fish in Different Environments. Two Examples from the Oligotrophic Mediterranean Sea
- Author
-
Bonanno, Angelo, primary, Giannoulaki, Marianna, additional, Barra, Marco, additional, Basilone, Gualtiero, additional, Machias, Athanassios, additional, Genovese, Simona, additional, Goncharov, Sergey, additional, Popov, Sergey, additional, Rumolo, Paola, additional, Di Bitetto, Massimiliano, additional, Aronica, Salvatore, additional, Patti, Bernardo, additional, Fontana, Ignazio, additional, Giacalone, Giovanni, additional, Ferreri, Rosalia, additional, Buscaino, Giuseppa, additional, Somarakis, Stylianos, additional, Pyrounaki, Maria-Myrto, additional, Tsoukali, Stavroula, additional, and Mazzola, Salvatore, additional
- Published
- 2014
- Full Text
- View/download PDF
27. Assessing population structure of European Anchovy (Engraulis encrasicolus) in the Central Mediterranean by means of traditional morphometry
- Author
-
Traina, Anna, Basilone, Gualtiero, Saborido-Rey, Fran, Ferreri, Rosalia, Quinci, E., Masullo, T., Aronica, S., Mazzola, Salvatore, Traina, Anna, Basilone, Gualtiero, Saborido-Rey, Fran, Ferreri, Rosalia, Quinci, E., Masullo, T., Aronica, S., and Mazzola, Salvatore
- Abstract
For the first time the structure of the anchovy stock was investigated in the Strait of Sicily: sampling locations were in Sicily, in Tunisia and in the Adriatic Sea. A morphological approach to stock discrimination which involves morphometric landmarks analysis was adopted. The aim of this work is to describe any morphological variations between the samples areas and individuate possible different populations in order to obtain useful information for management of shared resources between Tunisian and Italian waters. Furthermore sexual dimorphism was investigated. Results of morphometric landmarks may suggest a high level of overlapping among Sicily and Tunisia. Instead, between the Sicilian and Adriatic population, it was observed a certain degree of isolation, suggesting the existence of two anchovy sub-populations connected by a possible migration of a small number of individuals. No differences between male and female individuals was observed. Results support the likely existence of an anchovy metapopulation with several sub-populations, one inhabiting the northern and southern parts of the Strait of Sicily. From a management perspective and under the ‘precautionary approach’, these sub-populations should be treated as shared stocks and conserved
- Published
- 2011
28. Validation of macroscopic maturity stages according to microscopic histological examination for European anchovy
- Author
-
Ferreri, Rosalia, Basilone, Gualtiero, D'Elia, Marta, Traina, Anna, Saborido-Rey, Fran, Mazzola, Salvatore, Ferreri, Rosalia, Basilone, Gualtiero, D'Elia, Marta, Traina, Anna, Saborido-Rey, Fran, and Mazzola, Salvatore
- Abstract
The identification and classification of macroscopic maturity stages plays a key role in the assessment of small pelagic fishery resources. The main scientific international commissions strongly recommend standardizing methodologies across countries and scientists. Unfortunately, there is still a great deal of uncertainty concerning macroscopic identification, which remains to be validated. The current paper analyses reproductive data of European anchovy (Engraulis encrasicolus L. 1758), collected during three summer surveys (2001, 2005 and 2006) in the Strait of Sicily, to evaluate the uncertainty in the macroscopic maturity stage identification and the reliability of the macroscopic adopted scale. On board the survey vessels, the maturity stage of each fish was determined macroscopically by means of an adopted maturity scale subdivided in six stages. Later, at the laboratory, the gonads were prepared for histological examination. The histological slides were analysed, finally assigning the six maturity stages for macroscopic examinations. A correspondence table was obtained with the proportion and number of matches between the two methods. The results highlight critical aspects in the ascription of macroscopic maturity stages, particularly for the present research aim. Different recommendations were evaluated depending on the scope of the study conducted on maturity (e.g. daily egg production, fecundity and maturity ogive computation). The most interesting results concern the misclassification of stage IV and stages III and V (the most abundant), which confirms their macroscopic similarity. Although the results are based on a small number of samples, the advantages and disadvantages of macroscopic and histological methods are discussed with the aim to increase the accuracy of correct identification and to standardize macroscopic maturity ascription criteria
- Published
- 2009
29. VITELLOGENIN AS A BIOMARKER OF EXPOSURE TO ENDOCRINE DISTRUPTORS IN TWO SPECIES OF MULLIDAE, Mullus barbatus AND Mullus surmuletus.
- Author
-
RAFFA, Alessandra, GARGANO, Antonella, FERRERI, Rosalia, PAPPALARDO, Anna Maria, MAÑANOS, Evaristo, and FERRITO, Venera
- Subjects
VITELLOGENINS ,BIOMARKERS ,SPECIES - Published
- 2021
30. Automatic classification of acoustically detected krill aggregations: A case study from Southern Ocean
- Author
-
Ignazio Fontana, Marco Barra, Angelo Bonanno, Giovanni Giacalone, Riccardo Rizzo, Olga Mangoni, Simona Genovese, Gualtiero Basilone, Rosalia Ferreri, Salvatore Mazzola, Giosué Lo Bosco, Salvatore Aronica, Fontana, Ignazio, Barra, Marco, Bonanno, Angelo, Giacalone, Giovanni, Rizzo, Riccardo, Mangoni, Olga, Genovese, Simona, Basilone, Gualtiero, Ferreri, Rosalia, Mazzola, Salvatore, Lo Bosco, Giosué, and Aronica, Salvatore
- Subjects
Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni ,Environmental Engineering ,Ross Sea ,Settore INF/01 - Informatica ,Ecological Modeling ,k-means ,Acoustic ,Krill ,Internal validation indices ,Software ,Hierarchical clustering - Abstract
Acoustic surveys represent the standard methodology to assess the spatial distribution and abundance of pelagic organisms characterized by aggregative behaviour. The species identification of acoustically observed aggregations is usually performed by taking into account the biological sampling and according to expert-based knowledge. The precision of survey estimates, such as total abundance and spatial distribution, strongly depends on the efficiency of acoustic and biological sampling as well as on the species identification. In this context, the automatic identification of specific groups based on energetic and morphological features could improve the species identification process, allowing to improve the precision of survey estimates or to overcome problems related to biases in biological sampling. In the present study, we test the use of well-known unsupervised clustering methods focusing on two important krill species namely Euphausia superba and Euphausia crystallorophias. In order to obtain a reference classification, the observed echoes were first classified according to specific criteria based on two parameters accounting for the acoustic response at 38 kHz and 120kHz. Different clustering methods combined with three distance metrics were then tested working on a wider set of parameters, accounting for the depth of insonified aggregation as well as for energetic and morphological features. The clustering performances were then evaluated by comparing the reference classification to the one obtained by clustering. Obtained results showed that the k-means performs better than the considered hierarchical methods. Our findings also evidenced that working on a specific set of variables rather than on all available ones highly impact k-means performances.
- Published
- 2022
31. A pattern recognition approach to identify biological clusters acquired by acoustic multi-beam in Kongsfjorden
- Author
-
Giovanni Giacalone, Marco Barra, Angelo Bonanno, Gualtiero Basilone, Ignazio Fontana, Monica Calabrò, Simona Genovese, Rosalia Ferreri, Giuseppa Buscaino, Salvatore Mazzola, Riko Noormets, Christopher Nuth, Giosuè Lo Bosco, Riccardo Rizzo, Salvatore Aronica, Giacalone, Giovanni, Barra, Marco, Bonanno, Angelo, Basilone, Gualtiero, Fontana, Ignazio, Calabrò, Monica, Genovese, Simona, Ferreri, Rosalia, Buscaino, Giuseppa, Mazzola, Salvatore, Noormets, Riko, Nuth, Christopher, Lo Bosco, Giosuè, Rizzo, Riccardo, and Aronica, Salvatore
- Subjects
Settore ING-INF/05 - Sistemi Di Elaborazione Delle Informazioni ,Environmental Engineering ,3D pattern ,Settore INF/01 - Informatica ,Cluster ,Ecological Modeling ,Fish school ,Multi-beam ,K-means ,Software - Abstract
The Svalbardsis one of the most intensively studied marine regions in the Artic; here the composition and distribution of marine assemblages are changing under the effect of global change, and marine communities are monitored in order to understand the long-term effects on marine biodiversity. In the present work, acoustic data collected in the Kongsfjorden using multi-beam technology was analyzed to develop a methodology for identifying and classifying 3D acoustic patterns related to fish aggregations. In particular, morphological, energetic and depth features were taken into account to develop a multi-variate classification procedure allowing to discriminate fish species. The results obtained from clustering suggest that from a mathematical point of view three distinct groups could be identified. The proposed approach, that allows to discriminate the acoustic patterns identified in the water column, seems promising for improving the monitoring programs of the marine resources, also in view of the ongoing climate changes.
- Published
- 2022
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.