Search

Most clustering algorithms have been designed only for pure numerical or pure categorical data sets while nowadays many applications generate mixed data. It arises the question how to integrate various types of attributes so that one could efficiently group objects without loss of information. It is already well understood that a simple conversion of categorical attributes into a numerical domain is not sufficient since relationships between values such as a certain order are artificially introduced. Leveraging the natural conceptual hierarchy among categorical information, concept trees summarize the categorical attributes. In this paper we propose the algorithm ClicoT (CLustering mixed-type data Including COncept Trees) which is based on the Minimum Description Length (MDL) principle. Profiting of the conceptual hierarchies, ClicoT integrates categorical and numerical attributes by means of a MDL based objective function. The result of ClicoT is well interpretable since concept trees provide insights of categorical data. Extensive experiments on synthetic and real data set illustrate that ClicoT is noise-robust and yields well interpretable results in a short runtime.

The coastal area of the water and drought graft area and the common area of the performance of two ecosystems with separate characteristics are one another. Coastal environment is a natural evolutionary system that includes the most complex and, at the same time, the richest ecosystems on the planet. This region is a transitional and highly vulnerable region and is endangered by the accumulation of pollutants due to the acceptance of drought and marine pollutants. Marine pollution and the effects of drought activities that are the result of socioeconomic development on the coastline and its catchments are one of the most important issues in most of the world, which directly affects coastal habitats. According to research conducted in Iran on identifying areas and sensitive resources, these areas and resources are divided into two distinct groups: 1) The group of biologically sensitive resources: includes mangrove forests, coral reefs, marine turtles, aquatic birds, marine plants and marine mammals. 2) The group of sensitive physical resources: includes the physical building of beaches in the sub-sections of mud, sand, rocky and hydrographic forms of shores in aquatic, estuarine, clay and small bay. Iranian Fisheries Science Research Institute Published

Goals of this investigation were optimum times to harvest and ban and determination of total allowable catch (TAC) of shrimp in Hormozgan in the year of 2016. Sampling was by bottom trawler boats in the habitate of shrimp stock in Sirik to Dargehan on three month occur befor the catch season was started. Optimum times to harvest and ban was offered on 2016/10/5 and 2016/11/21 resprctively. Total allowable catch for main species (banana, tiger and indian white shrimp) and other species (jinga and stebbinji) estimated 830 and 350 tones, totally 1180 tones. Main challenges in recent years that affected living resources such as shrimp, are three subjects, climate changes, use coastal areas in wrong ways, and illegal shrimp fisheries which can effect on recruitment of shrimp to fishing area. Iranian Fisheries Science Research Institute Published

The research was carried out to investigate phytoplankton, zooplankton and Ichthyoplankton of Khamir, Laft in the western parts of Hormozgan Province and Tiab, Yekshabeh in the eastern parts of it for one year from March 2015 to November 2016. The aim of the study was to achieve seasonal changes of phytoplankton, zooplankton and Ichthyoplankton and compare them among estuaries. In order to achieve this goal, four stations were determined and seasonally sampled. Phytoplankton was taken 2 liter by bottle from 0.5 m below water surface, Zooplankton sampling was done by using standard plankton net with 55 micron mesh size that well equipped with flow meter by horizontal pulling and Bongo Net with 300 micron mesh size used for Ichthyoplankton sampling. During the study, 80 species of phytoplankton were identified, including 53 species, 24 species Dinophyceae, Cyanophycea 2 species and 1 species belonging to Dictyochophyceae. East and West estuaries had the 63% similar percentage of phytoplankton and results showed that 54 Bacillariophyceae genus were common in two regions. The Tiab estuary showed an average 21524±5903 cells/L of phytoplankton high density. Zooplankton was identified with eight phylum. The study of seasonal variations showed that in all seasons crustacean had higher density than other groups. Four copepods orders were identified which the calanoid had higher density and distribution in compare to others. 19 families of the larvae were identified and 69/99% similarity was also observed between estuaries of two region. Glupeidae, Gobiidae, Engraulidae and Scianidae families were abundant than other families. Shannon-Wiener, Maraglef and Evenness biological indices were found higher in west than the East estuaries. The results showed values were the highest in laft estuary, respectively H'= 3/22, d=7/11 and J'=0/72. The lowest biological indices in Tiab estuary, respectively H'= 2/233, d= 4/109 and J'= 0/597. The estuaries in the West had more diversity and eveness. The highest and lowest of biological indices were obtained (d= 5/948 and H= 2/759) and (d=2/825, H=0/830 and J=0/249) in the winter and summer, respectively. Iranian Fisheries Science Research Institute Published

Qeshm Hara protected area is the largest and only biosphere reservoir in the Persian Gulf and Oman Sea that covered with mangroves. This study was aimed for population structure and species diversity of fishes in Hara protected area. Fishes were sampled monthly in 5 stations by fixed set-net(Moshta), drift set net (Khoorband), trawl survey and beach seine net method from September 2016 to August 2017. A totally of 16521 fish individuals were collected belong to 115 species, 92 genus and 57 family. The most frequent family of fishes were Leiognathidae (40.4 %), Mugilidae(11.4%), Pristigasteridae(5.9%), Clupeidae(5.8%), Gerreidae(5%), Sillaginidae(3.2%). The most dominant species was Nuchequula gerreoides with 6383 individuals (38.6%), along with Ilisha melastoma, Gerres oyena, Nematalosa nasus, Liza melinoptera, Liza klunzingeri, Osteomugil perusii , Sillago sihama, Upeneus sulphureus, Acanthopagrus arabicus and Pomadasys kaakan formed about 75 percent of the all collected fishes. Population dynamics of dominant fishes (16 species) were estimated using length frequency analysis, the results showed that the dominant were high growth rates and short-lived. Most fish have a life span of less than 10 months, only the Liza klunzigeri, Sillago sihama and Pomadasys kaakan have a mean life span of over one year in the studied area. The natural mortality rates of predominant fishes were generally higher than 1, except for Plotosus lineatus, which was 0.92. The fishes exploitation rates were above 0.5, except for 5 species of Ilisha melastoma, Nematalosa nasus, Nematalosa resticularia, Osteomugil persuii and Pomadasys kaakan, were less than 0.5. Investigating the diversity indices in the Hara protected area indicates the biological richness of this area, so that the lowest Margalf index was 42.5 at station 5 and the highest was 9.96 at station 1. The results of the Shannon index showed that station 2 had the lowest with 1.71 and station 1 with the highest score of 3.05. The Simpson index, except at station 2, equal to 0.54, was higher than 0.8 in other stations. The lowest Pilou index was 0.4 at station is 2 and the highest at station 3 with 0.73. The assemblage of fishes follows the clumped pattern distribution. The ABC curve and the W-Statistic index measured in the survey area indicate a desirable situation and the none-stress conditions in the Hara protected area. Iranian Fisheries Science Research Institute Published

Protecting coastal aquaculture systems as a habitat for aquatic systems is one of the serious concerns of the world. In the present study, spatial and temporal variations of Some physicochemical parameters, nutrient concentration and water quality In some estuaries of East and West of Hormozgan province were investigated from March 2015 to February 2016.Data analysis was performed using multivariate statistical methods (such as: CA,DA and PCA Analysis) and Eutrophication and water quality index using multivariable indices. The average annual variation of various parameters studied in West Azarbaijan province of Hormozgan is as follows:water temperature (18.1-34.6Co ), Salinity (35-45.6 ppt), Dissolved Oxygen (4.6-7.4 mg.l), pH (8.01-8.4), Nitrate (32.5- 403.5µmo.l), Nitrite (3.6-50.7 µmo.l), Total Ammonia (9.8-311.2 µmo.l), phosphate (22-569.1.6 µmo.l), and chlorophyll-a is equal to(0.46-4.04 mg.m3 ), respectively.Also, the mean annual variation of the various parameters studied in the eastern province of Hormozgan has been as follows: water temperature (18.1-34.6Co ), Salinity (35-45.6 ppt), Dissolved Oxygen (4.6-7.4 mg.l), pH (8.01-8.4), Nitrate (32.5-403.5µmo.l), Nitrite (3.6- 50.7 µmo.l), Total Ammonia (9.8-311.2 µmo.l), phosphate (22-569.1.6 µmo.l), and chlorophyll-a is equal to(0.46-4.04 mg.m3 ), respectively. One-Way Analysis of Variance test showed that the significant for some differences physicochemical parameters varied seasonally.Discriminant analysis, water quality conditions in terms of location classified into three groups.The analysis of PCA showed that the amount of nitrate and total ammonia in the tiba and phosphate in Laft and Kgamir Stricks with two sources (domestic and agricultural waste) and natural sources, can be considered as the main factors affecting the intensity of Eutrofication.The range of trophic Trix and TI eutrophication index in the studied areas were 4.3-6.1 and 3.5-4.2 respectively.According to on the indicators of and TI index, trophic status was classified into mesotrophic(in laft and khamir areas), Oligo-Mezotrophic(Yekshoveh area) and mezo- eutrophic respectively. Also Based on Trix index, the Water quality status was from bad condition in tiab area and good condition in laft, khamir and yekshoveh areas respectively. The determination of trophic conditions with a single-variable method based on chlorophyll a and Total inorganic Dissolved materials(DIN) showed a Very good agreement with multivariate trophic indices.The range of changes in some of the parameters studied in this study was more than the reported limit for the conservation of aquatic life in coastal areas. Iranian Fisheries Science Research Institute Published

Heavy metals are among the pollutants found in urban and industrial wastewater. Various industries, such as the metal, oil and petrochemical activities are among the main sources of heavy metals discharging into the marine environment. Hormozgan province, especially Bandar Abbas City, showed significant growth in chemical industry and high urbanization rates in recent years, which could have a significant potential for heavy metals entering the coastal ecosystem. The present study aims to monitor the concentration of heavy metals (including Fe, Cu, Pb, Cd, Ni, Co) in sediments collected from East and West of Hormozgan province and assessing the status of pollutants by comparison with regional and international standards. In this research, shrimp habitats were selected on the basis of Tib, Yekshabeh, Laft and Khamir. In order to investigate heavy metals in shrimp habitats of Hormozgan province, the study was conducted seasonally from autumn 1394 to summer of 1395. Copper, Nickel, and Cobalt metals were measured by flame atomic absorption and other metals using a furnace atomic absorption device. The results of Iron measurement in sediments of sampling stations showed that maximum concentration was 1.576 mg/kg in winter at Tiab estuary, while in summer this amount was related to Khamir estuary and reached to 1.578 mg/kg. In both summer and winter, copper had the highest amount of copper in the Tiab estuary with amount of 0.377 mg / g and 0.358 mg / g, respectively. The maximum observed concentration of Nickel in Tiab estuary is 0.114 mg / kg in summer. This amount was 0.069 mg / kg for cadmium in winter in Tiab estuary sediments. Lead and Cobalt metal exhibited their maximum concentration at the same time and place with0. 403 mg / kg and 0.247 mg / kg, respectively. In general, based on the findings of this study, the average concentration of heavy metals in the surface sediments from Hormozgan estuaries was recorded as Fe> Pb> Cu> Co> Ni> Ca. The assessment of the environmental quality of the sediments for all heavy metals showed that the measured values were lower than the guidelines and none of the metals was evaluated at poluuting level. In order to protect mangrove ecosystem and control the amount of heavy metal pollution, periodic monitoring of these metals in sediments of the study area is recommended. Iranian Fisheries Science Research Institute Published

The most important habitats of mudskippers are muddy areas in tidal zone of tropical mangrove forests. Mudskippers are related to Oxudercinae subfamily of Gobiid fishes. Three most distributed species of Hormozgan mudskippers were Periophthalmus waltoni, Boleophthalmus dussumieri and Scartelaos tenuis. These fishes can be considered as euryhaline and eurythermal aquatic species, because they can tolerate a wide range of salinity and temperature. A research was done since september 2008 to september 2009 in two important mangrove regions of Hormuzgan (Tyab and Khamir) to determine some ecological characteristics of inhabited mudskipper species. Results showed that nitrate levels are significantly different between tidal lines and seasons (P

The most important habitats of mudskippers are muddy areas in tidal zone of tropical mangrove forests. Mudskippers are related to Oxudercinae subfamily of Gobiid fishes. Three most distributed species of Hormozgan mudskippers were Periophthalmus waltoni, Boleophthalmus dussumieri and Scartelaos tenuis. These fishes can be considered as euryhaline and eurythermal aquatic species, because they can tolerate a wide range of salinity and temperature. A research was done since september 2008 to september 2009 in two important mangrove regions of Hormuzgan (Tyab and Khamir) to determine some ecological characteristics of inhabited mudskipper species. Results showed that nitrate levels are significantly different between tidal lines and seasons (P

Harmful algal blooms are global and expanding phenomena that cause adverse effects on human health, structure and function of ecosystems, fishery industries and aesthetics of the coastal regions. One of the major methods that was considered in integrated management strategy to control HABs is biological control using indigenous bacteria. The main aim of the present study was to achieve indigenous bacteria that could control HABs in Persian Gulf in lab scale. The water and sediment samples were collected seasonally from 10 stations throughout the Hormozgan province. In addition, four sponge species and three coral species were collected as isolation source of bacteria. The seasonal frequency pattern of bacteria in water and sediment samples showed that the minimum frequency was recorded in winter and the maximum was observed in the spring and summer. The diversity pattern of isolated bacteria revealed the higher bacterial diversity in sediment samples rather to water samples. The Vibrionacea, Bacillaceae, Enterobacteriaceae and Pseudomonadaceae families were dominated in sediments and water samples. While in sponge and coral samples the Streptomycetaceae and Alteromonadaceae families were prevalent. The algicidal pattern of isolated bacteria against Cochlodinium polykrikoides as a screening index revealed that sponges and corals included the highest proportion of potent algicidal bacteria (>90%) with 40% and 28% respectively. Among 30 selected isolates, extracted secondary metabolites from 26 isolates exhibited LC50 less than 1 mg/ml against C. polykrikoides. Stepwise screening strategy was used to obtain bacteria with selective spectrum activity. Hence, biological activity of potent isolates were determined against related organisms. In this regard, the result of algicidal assay showed that 9 isolates could not inhibit the growth of galbana Isochrysis and Chlorella vulgaris as useful algal strains. The extracted metabolites from 90%, 55%, and 35 % of potent isolates exhibited antifungal activity against Candida albicans, Aspergillus niger and Penicillium chrysogenum at range of 64 to 1024 µg/ml. Moreover 65, 40, 80 and 25% of isolates showed antibacterial activity against Staphylococcus aureus ،Escherichia coli, Micrococcus luteus and Pseudomonas aeroginosa varied from 32 to 1024 µg/ml. Toxicity assay against Artemia salina revealed 30 % of isolates were not toxic up to 1000 µg/ml. in addition, 6 isolates showed any toxicity against shrimp larva in vitro. Determination of toxicity against human umbilical vein endothelial cells revealed that five isolates were not toxic and one isolate exhibited low toxicity. Finally, these six isolates selected for further studies. The growth kinetics of these six isolates revealed the relationship between the number of bacteria and their algicidal activity in co-culture condition. Moreover, the production of secondary metabolites determined as the main algicidal mechanism. The results of polyphasic identification showed that S 202, SP 149, SC 77, SP 158 and SC 41 isolates were new strains of Streptomyces rochei،Streptomyces olivaceus ،Streptomyces cavourensis، Pseudomonas azotoformans، Vibrio alginolyticus and W12 was belonged to Vibrio rotiferianus. The evolutionary route, genetic distance and divergency rate of the strains were determined. Chemical screening revealed the chemical profile and identity of extracted secondary metabolites from the six strains. Their chemical profile showed the presence of some functional groups, including terpenoids, flavonoids, peptides, indole alkaloids and phenols in crude extracts. The chemical identity of algicidal fractions of S 202, SP 149, SC 77, SC 41 strains were determined as terpenoid or flavonoid. While, the active fraction of SP 158 and W 12 belonged to phenols and peptide groups respectively. After the purification using chromatographic methods, high performance liquid chromatography recorded the retention time 10.58 and 11 for the active fractions of SC 41 and SP 149 respectively. This project led to the discovery of six strains of indigenous bacteria with selective algicidal activity against C. polykrikoides as the main cause of HABs in Persian Gulf and Oman Sea. These indigenous strains have essential prerequisites for biological control agent in situ condition and can consider as potential candidates in marine environments and aquaculture farms and cages in field studies. In addition, this study provided new understanding of seasonal distribution pattern and biodiversity of culturable bacteria in marine sediments and waters as well as bacterial diversity of collected indigenous sponge and coral samples from the Persian Gulf. Iranian Fisheries Science Research Institute Published

In order to study the ecological status of western and estern estuary of of Hormozgan, sampling of sediments in four stations in each estuary was carried out seasonally from spring to winter of 2016. In this study, 118 species of polychaets, 71 species 0f crustacea, 25 species of bivalves and 20 species of gastropods were introduced. The average density of macrobenthos population in indicated that the station 2 in Laft with 1522, station 1 in Khoran with an average of 3397 and station 4 of Yekshabe and Tiab with a mean of 980 and 1577 inm-2 respectively were the most densely populated. In laft, Margalef index, with the values of 7.44 in station 2, Shannon with 2.68 in Station 3, Pielo-Evenes with 0.77 in station 3, Simpson index with 0.43 in station 4 and w- Statistic with a value of 0.3 at station 3, In khooran Margalef index with a value of 43.4 at station 2, Shannon with a value of 2.78 at station 2, pielo-Evenes with a value of 0.66 at station 2, Simpson index with a value of 0.61 at station 1 and index w -statistic with a value of 0.1 at station two, In Yekshabeh, Margalef index with 8.83 in station 4, Shannon with a value of 3.68 at station 4, Pylou-Evenes with a value of 0.88 at station 4, Simpson index with a value of 0.11 at station 3 and w- Statistic with a value of 0.24 at stations two and four, and im Tiab, the Margalf index with a value of 10.46 at station 4, Shannon with a value of 3.47 at station 4, Pylou-Evenes with a value of 0.83 at station 2, Simpson index with a value of 0.17 at station 1 and index w -statistic with the value of 0.29 at station 4 were the highest in this survey. Totaly, these quantitative and qualitative indices based on weight ABC for Laft and Khoran discribed relatively contaminated and for Yekshabe and Tiab discribed non-contaminated condition In sum, these quantitative and qualitative indices based on ABC weight for leachate and dough conditions were relatively contaminated and for one and the other cobbins, non-contaminated conditions, due to which can be adjacent to the West Bank with the Persian Gulf, low depth and limited water exchanges, and as a result , the accumulation of materials from pllutands in thisestuaries and their impact onbenthic communities. Iranian Fisheries Science Research Institute Published

This study is carried out in the Tyab and Yek-Shabeh creeks in the east, and creeks of the Laft and Khamir in the west of the Hormuzgan province from Sep.2016 to Feb. 2017.Ordination metnods(Canonical discriminate function analysis and principal component analysis) were used to interrelationships between biological and non-biological factors. The studied creeks were classified based on pollutants(Total Petroleum Hydrocarbons(TPH) and Heavy metals) and ecological conditions in three groups: Tyab and Khamir, and Yek-Shabeh and Laft, that is showed the studied factors have the ability to study on the density and diversity of shrimp. From among the six components identified, TPH in Tyab, Laft and Khamir creeks and nitrate and nitrite in Tyab, Laft and Yekshabeh creeks had the most role in relation to shrimp biomass and abundance. Also, among heavy metals in this study, only Iron and lead elements in Laft creek are showed the maximum relationship with biomass and the number of shrimp and banana shrimp among the studied elements. In addition, TPH are did not relationship to the biomass and number of shrimp only in Yek-Shabeh, while in the other three creeks its role has been well defined. TPH and heavy metals did not play a significant role in the number and biomass of shrimp in the creeks of Tyab and Yek-Shabeh(the east of province) unlike Laft and Khamir creeks(the west of province) and the most effects were ecological parameters and bentose communities. In the east of the region, unlike the western provinces of the province, total petroleum hydrocarbons and heavy metals did not play a significant role in the number and biomass of shrimp, and the most effects were ecological parameters and bentose communities.TPH and Heavy metals, with some of the most ecological factors, has had an impact on the number and biomass of shrimp communities the western part of the province (creeks of Laft and Khamir). Also, results of PCA test in evaluating some of the meteorological factors on commercial shrimp catch showed wind parameter had the most negative effect, and rainfall and temperature had a positive effect on shrimp catching. In this study, was highlighted the role of ecological factors as factors influencing on the fluctuations of commercial shrimp catch of the Hormuzgan province in comparison with TPH and heavy metals.Therefore, in order to sustainable management of shrimp stocks in the Hormuzgan province is recommended the control of the factors influencing the biological condition of shrimp in nursery grounds with control of fishing effort. Published

The purpose of this study was to evaluate Total petroleum hydrocarbons (TPHs) in surface sediments of Khamir, Laft, and Yekshabeh and Tiab esturies. For this purpose, sampling of surface sediments was carried out at 16 stations (four stations at each estury.In each sample, four points were taken from the beginning, the middle, the end and the junction point to the sea.The physicochemical properties of sediment such as grain size and total organic matter (TOM) were measured using standard methods. The concentration of total petroleum hydrocarbons was determined using Ultraviolet Fluorescence (UVF). Petroleum hydrocarbons showed limited variations from 53.11 to 2052.5 ng/g dry weight in the summer season and from 128.5 to.4392.5 ng/g in winter. The average detected concentrations for total hydrocarbons were lower than the environmental hazard (4000 ng/g). Most of their concentrations were observed at Yekshabeh estury in winter, possibly due to the pollution caused by the activity of ports and fishing vessels. Also, the assessment of environmental hazard caused by pollution of hydrocarbons for aquatic organisms by using SQSs and contamination coefficient (Cf) showed that the studied sediments except station 1 at Yekhshabeh estury in winter season (Cf = 0.91) has no adverse biological effects on aquatic organisms. Finally, the results of statistical analysis of the data showed that the physicochemical parameters of sediments (grain size and total organic matter (TOM)) and the total petroleum hydrocarbons were not correlated, which could indicate the existence of different sources for each studied parameters. Iranian Fisheries Science Research Institute Published

The relationship between diversity or density of phytoplankton and other marine fisheries sector is of great importance. The study of Spatial and temporal variability of distribution of phytoplankton communities in the coastal waters of the Northern Persian Gulf (QESHM, LENGEH) were studied during 2008. In this study, five groups (47 genera) of phytoplankton include, Bacillariophyceae, Dinophyceae, Cyanophyceae, Crysophyceae and Euglenophyceae were identified. The result showed that Diatoms group (79.6 %) and Rhizosolenia genus (45.5 %), contributed more towards the percentage composition of different groups and genera of phytoplankton at the during Study. The annual changes in relative abundance and Margalef, Shannon, pielu and Simpson indices were estimated, 0.58-2.56, 0.08-0.97, 0.23-2.6, 0.09-0.93 respectively. Multivariate analysis of variance showed that during the study, density and biological indicators of phytoplankton were significant between seasons (p

BACKGROUND AND OBJECTIVE: Family structure plays an important role in self-concept development of family members. Despite this, our information about relationship between self concept and power as ability of influence on behaviors of family members and cohesion as emotional relationship of family members in Iranian society is insufficient. The purpose of this study was to detect the relationship between students self concept and their perception of cohesion and power structure in family.METHODS: This cross sectional study performed at Shiraz nursing school. Samples consisted of 130 nursing students selected by purposeful sampling. The self-concept of students was measured using 80 items Coopersmith self-concept inventory, maximum and minimum possible score on the scale is +80 and -80. Various aspects of relationship including cohesion and power in typical and ideal situation have 16 scores. Data were collected daily over a 2 week period using Family System Test (FAST), to measure perceptions of family members about power and cohesion in typical and ideal family due to place schematic figure on the board.FINDINGS: There was a positive and significant relationship between the students self-concept and their perception of cohesion between student-father (r=0.67), student-mother (r=0.38), and father-mother (r =0.4) in real family (p=0.0001). However, there was a reverse and significant correlation between the students self-concept and their perception of power between father and mother in the family (r=-0.26, p=0.003). There was a statistically significant difference between real (10.15 ± 84) and ideal family (10.46±42) regarding to the students perception of family cohesion and power (p≤0.0001).CONCLUSION: These findings revealed that students self-concept rate, had a significant direct correlation with their perception of family cohesion and power. So this issue should be considering in family and parents education programs.

Aspects of the biological features such as age and growth , the reproductive cycle , food and feeding of the Longnose Trevally (Carangoides chrysophrys) were studied from a total 376 specimens collected by use of trawl fishing in Hormuzgan waters between February 2014 and February 2015. The minimum and maximum total length during different months were between 25.5 and 80 cm respectively. Weight-length relationship for Longnose Trevally was W = 0/0064L 2/9004. This fish had an isometric growth. Fishes aged using sections of their otoliths . The equation of growth for Longnose Trevally obtained Lt = 85(1-e -0/266(t+1/443) ). Total mortality rate for Longnose Trevally was 0.412. LM50 and TM50 for Longnose Trevally was 46 cm, 2 years. Sex ratio(femail : male) for Longnose Trevally was 1/42:1. Maximum absolute and relative fecundity for Longnose Trevally were 479992 and 354 respectively. The highest GSI in April (2.86) and the lowest was in June 2014 (0.43). It has a long spawning season from January to May and spawning peak was observed in May. Longnose Trevally was Relatively low feed (CV= 65.49). Main food for Longnose Trevally were bony fish(Fp= 91.67). Random diet of Longnose Trevally were crustaceans (Fp = 4.17) (shrimp, crab and squilla) and mollusks (Fp =4.17) (cutlle fish, Squid), respectively. Iranian Fisheries Science Research Institute Published

In this research, size selectivity for narrow-barred Spanish mackerel (Scomberomorus commerson) and other species such as Indo-Pacific king mackerel (Scomberomorus guttatus), Longtail tuna (Thunnus tonggol),Kawakawa (Euthynnus affinis), Talang queenfish (Scomberoides commersonnianus) and John's snapper (Lutjanus johnii) were investigated in mesh sizes of surface, mid-water and bottom drift nets in coastal waters of Bandar Abbas and in the western part of Hormozgan province (fishing ports of Gong and Bustaneh), as well as of catch composition from the fisheries. The data required for the relevant analysis was collected for the years 2012-2014. In order to determine the size selectivity of the investigated species, cumulative probability distributions of retention girth (operculum and maximum girth) at length was used. The results indicated that there is a linear relationship between length (fork length or total length) and transvers morphometric parameters in six positions of girth at fish species. Seven types of gillnets with stretched mesh sizes of 70, 76, 79, 101, 114, 132 and 165 mm and different technical characteristics were investigated for size selectivity of S. commerson, in which the optimal length were 38, 44, 49, 63, 74, 86 and 100 cm FL in the respective meshes. The capture processes of S. commerson was mostly in wedging in the all mesh sizes, whereas in the other species, depending on the morphology of fish, the retention method was different. The comparison of length frequency distribution of kingfish with mean length at maturity (Lm50%) indicated that, depending on mesh size, the frequency of the immature fish in the catch was between 4 and 100%. On the basis of optimal length at mesh size, the minimum legal mesh size of kingfish was estimated as 162 mm. Size selectivity curve was also represented for other species, which depending on fish morphology the model was inadequate in fitting the data. The results from the catch composition showed that the species diversity is different by fishing method. In mesh sizes of 70, 76 and 79 mm, the kingfish was captured in target and bycatch species depending on time by the surface drift gillnet fishery operated by the fishing boats. In this type of gillnet fishery, bycatch accounted for more than half of the total catch in which some of the species was important economically. Catch composition in gillnet fishery operated by dhows was different depending on fishing method. At the first step, it is necessary to impose a ban on gillnets with mesh sizes of 70, 76 and 79 mm in second half of the year. In the next step, for establishing the regulation on minimum legal mesh size of kingfish, it needs to do further study in seas trails aimed at determine the appropriate mesh size. Also, in the multispecies fishery, it is necessary to do a research for optimization of mesh sizes of gillnets and to implement minimum legal mesh size for the main target species.

Regarding to monitor of demersal resources in the Persian Gulf and Oman Sea, and also biomass and CPUA estimation of them, ten research cruises were carried out by using R/V Ferdows-1 equipped with bottom trawl, covering the area from 49º 00´ E in the west (north-west Persian Gulf) to 61º 25´ E in the east (borderline with Pakistan) from 2012 to 2014 The study area was stratified into 17 strata (A to Q) of which 10 strata (A to J) were in the Persian Gulf and 7 strata (K to Q) were in the Oman Sea, covering the depths of 10-50 m in the Persian Gulf and 10-100 m in the Oman Sea. A total of 316 stations were randomly selected and the biomass and CPUA were estimated by swept area method During this three years period, the strat A and B weren’t covered. The comparison between two regions indicated that the percentage of density of demersal fishes in the Persian Gulf during years 2012, 2013 and 2014 were 1.0, 1.4 and 1.6 times more than the Oman Sea and totally 50-60% of total biomass was found for the Persian Gulf. Also a comparison among 17 strata the highest biomass was found for K region (Sirik to Jask) in the Oman Sea in 2012 & 2014; and C region (Genaveh to Bordkhoon) in 2013 in the Persian Gulf. The same comparison was done for CPUA of commercial, non-commercial and total in both water bodies and it was found that in years 2012 to 2014 the region K (Sirik to Jask) in the Oman Sea and Stratum Q (Bersi to Gwatr) had the highest value of CPUA. On the contrary, the startum M (Biahi to Galak estuary) showed the lowest value of biomass for both commercial and non-commercial fishes. With review the mean CPUA in defferent depth layers for years 2012, 2013 and 2014, it was concluded that in the Oman Sea with increasing the depth, the mean CPUA is decreased and the lowest CPUA belongs to depths of 30-50 m The comparison between commercial and non-commercial groups in both ecosystems, it concluded that the density of commercial species were higher than non-commercial ones; and for years 2009, 2010 and 2011 the commercial species consist of 63.4, 65.0 and 59.7 % of total biomass. In all years the Persian Gulf indicated higher values than the Oman Sea. The most abundant fishes were Rays, Ribbon fishes, Carangids, Grunts, Japanese threadfin bream, Lizardfish and Barracuda for both Persian Gulf and Oman Sea. Iranian Fisheries Science Research Institute Published

Aspects of the biological features such as age and growth, the reproductive cycle , food and feeding of the Longnose Trevally (Carangoides chrysophrys) were studied from a total 376 specimens collected by use of trawl fishing in Hormuzgan waters between February 2014 and February 2015. The minimum and maximum total length during different months were between 25.5 and 80 cm respectively. Weight-length relationship for Longnose Trevally was W= 0/0064L 2/9004. This fish had an isometric growth. Fishes aged using sections of their otoliths. The equation of growth for Longnose Trevally obtained Lt=85(1-e-0/266(t+1/443)). Total mortality rate for Longnose Trevally was 0.412. LM50 and TM50 for Longnose Trevally was 46 cm, 2 years. Sex ratio(femail : male) for Longnose Trevally was 1/42:1. Maximum absolute and relative fecundity for Longnose Trevally were 479992 and 354 respectively. The highest GSI in April (2.86) and the lowest was in June 2014 (0.43). It has a long spawning season from January to May and spawning peak was observed in May. Longnose Trevally was Relatively low feed (CV= 65.49). Main food for Longnose Trevally were bony fish (Fp= 91.67). Random diet of Longnose Trevally were crustaceans (Fp=4.17) (shrimp, crab and squilla) and mollusks (Fp=4.17) (cutlle fish, Squid), respectively.