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Kol River drains into the Persian Gulf and its watershed encompasses  areas  in  Hormozgan, Kerman and Fars provinces. Identification of fish species of the river was conducted seasonally from summer to winter 2005. We selected 8 sampling stations based on the height of  sea  level  from branches of Kol River near estuary. Totally, 160 specimens were caught with gillnet, cast net and hook. We identified 12 species, 12 genera, 7 families and 5 orders. The most diverse family was Cyprinidae represented by 5 species and 5 genera. In this family, Cyprinion watsoni was caught in 6 sampling stations and Cyprinus carpio species in only one station. Close to estuary, we found marine fish species such as mudskipper of Gobiidae, milk fish of Chanidae, ladyfish  of Elopidae, and two species of Mugilidae families. The latter two species of Mugilidae were not seen in other stations. Of the  identified  species,  Iranocichla  hormuzensis,  Garra persica  and  Schistura  sargadensis  were endemic and Cyprinus carpio was considered exotic.

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Thunnus tonggol is one of the most important large pelagic fish species in Hormuzgan province waters. Nominal catch of T. tonggol in 2010 was 32405 tones comprising 65% of total catch of large pelagic fishes. For sustainable exploitation of the resources of this fish, we need to identify its fishing pattern, maximum constant yield and recruitment pattern. Hence, length and weight data were collected randomly from 6 major artisanal fish-landing sites Hassineh, Kong, Bandar Abbas, Salakh, Sirik and Jask in Hormuzgan province, starting in April 2010 over one year. Growth parameters L∞ and K were estimated at 112.23cm 0.3 and (1/year), respectively. Hence, the natural mortality was calculated at 0.43 (1/year) and the maximum constant yield was computed at 11880 tones. Length-weight power relationship, W= aFLb, was W= 3×10-05FL2.82 that showed T. tonggol have isometric growth. Fishing pattern indicated that almost 85% of the catch was under the size at first maturity. Maximum recruitment pattern was in November with average fork length being 27cm. For optimum exploitation of T. tonggol stocks, we suggest two approaches including fishing ban in the maximum recruitment time and gear (Drift gillnet) modification. * Corresponding author

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As pearling has been banned in Iran since 2006, stocks of pearl oysters has not been investigated during these years therefore, condition of natural habitats for Pinctada radiata in its old habitats was surveyed in present research. Shallow waters around Hendorabi Island were searched with diving and two habitats namely “Sooleh” and “Sahel-e-sheni”, were considered for study. The pearl oysters had most distribution in these habitats in depth ranges of 7 to 12 m and 8 to 11 m, respectively. Total stock in Sooleh and Sahel-e-sheni was surveyed near 35700 and 12563 Pinctada radiata, respectively, of which 22% and 67% were catchable, respectively. Catch Per Unit of Area (CPUA) in Sooleh and Sahel-e-sheni habitats was estimated equal to 0.3 N/m2 in both habitats, and Catch Per Unit of Effort (CPUE) in these habitats was calculated equal to 59.5 N/hr and 50.3 N/hr, respectively. Results of this study demonstrated that area, stocks and CPUA for studied habitats were less than previous years. Despite of interdict of pearling in this region since 7 years ago, stock revival has done slowly.

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This study was conducted to compare heavy metal concentrations including lead and cadmium in liver and muscle tissues of Indian mackerel (Rastrelliiger Kanagurta) in Bandar Lengeh, Hormoz island, Hengam island and Kolahi regions. In current research, the influence of season, sex and size (length and weight) on Pb and Cd concentrations in Indian mackerel was investigated in these areas. Then Lead and cadmium concentrations in muscle tissues were compared with international standards for human consumption. Sampling was performed in summer and winter. Metal concentrations of organs were assessed by dry digestion method and atomic absorption spectrometer (AAS). Results showed that there are statistically significant differences between concentrations of lead and cadmium in liver and tissues of the fish in these regions (Bandar Lengeh, Hormoz, Hengam and Kolahi) (p<0.05), also concentrations of lead and cadmium have significant differences in summer and winter (p<0.05). The comparison of results of heavy metal concentrations with international standards including NHMRC, MAFF and WHO demonstrated that the amount of lead and cadmium is lower than allowable limits and doesn't have any problem for human consumption. Concentrations of Pb and Cd in both sexes of Indian mackerel have no significant differences (p>0.05). In addition, there is no correlation between lead and cadmium concentrations in muscle and liver of Indian mackerel with size (length and weight) (p>0.05).

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One of the comparison methods for evaluating fishing gears efficiencies is based on Catch per Unit Effort (CPUE). In this study, we used three different types of traps for catching oriental river prawn (Macrobrachium nipponense). Capture efficiencies and catch rates of cylindrical pot, opera house trap, and Hokkaido pot were compared with each other during the investigation in Anzali Lagoon. The results indicated that there is a significant difference (P˂0/05) among the amounts of CPUE of cylindrical pot (0.24±0.12 gr), opera house trap (4.17±0.84 gr) and Hokkaido pot (1.58±0.41 gr). There was a significant difference between the results of length frequencies of captured prawns that was trapped by cylindrical pot and opera house trap (P<0.05). Hokkaido, cylindrical and opera house traps were not significantly different from each other for length frequencies. The results indicated that opera house trap was an appropriate fishing gear for catching oriental river prawn because it had higher catch rates and caught prawns with higher length frequencies.
 

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Malabar trevally is one of the species of Carangidae family in the Persian Gulf and Oman Sea, which biological and population characteristics of this species were less been studied . In this regard, reproductive indices such as gonadosomatic, first maturity length, sex ratio, spawning season, absolute and relative fecundity were investigated. Reproduction studies of Malabar trevally (Carangoides malabaricus) were carried out in the waters of Hormozgan province from December 2016 to November 2017. Samples were collected monthly using trawl nets. Total, fork length and weight were measured. In this study, the total samples were 438, out of which 258 were females, 150 males and 30 immature. The minimum and maximum average fish fork length during the different months was 14-34 and 26.42±3.33 cm, respectively. The maturity female fork length (LM50) was 180 mm.  The sex ratio of female to male was 1.72 to 1 which showed a significant difference (P<0.05). Maximum absolute fecundity was 185432±8127 eggs in April and maximum relative fecundity of 570 23 eggs per gram in April. The minimum absolute fecundity was 66542±14197 in September and the minimum relative fecundity of 130 14 eggs per gram in June. The maximum GSI index of female and male fish were calculated 1.8 and 0.68 in March respectively which spawning could be started from April. 

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The aim of the present study was to risk assessment and zoning the unsustainability of shrimp fishery in the shrimp fishing-grounds of the Hormozgan province (Sirik to Toola). Data were collected during two shrimp fishing seasons in 2017 and 2018 (between September and December). The criteria affecting the shrimp unsustainability risks were extracted using international literatures and also conducting some in-depth and semi-structured interviews with the experienced fishermen and knowledgeable researchers. Thereafter, the coefficient of determination was obtained to each criterion by using a quantitative questionnaire. Finally, integration of these criteria was done by fuzzy-neural modeling. Data analysis indicated that 57.35% ±15.6 (±SD) of fishermen are totally satisfied with their job. The maximum value for ecology criteria was 0.56. in Kollahi fishing ground. In Bandar-Abbas fishing-ground, the highest values for fishermen's security threats, satisfaction with existing management status and social conditions of fishing communities' criteria were also computed 0.08, 0.18 and 0.08. The maximum coefficient of determination was belonged to catch volume (with 0.0922) and fishers' livelihood (with 0.409) in Dar-sorkh. The highest unsustainability risk was observed in Bandar Abbas and east of Sirik, while central regions and around of Darsarkh, Toola and Kollahihad the lowest. Ecological criteria were also maximum in the central areas of the province, which is indicating the suitable habitat conditions. The unsustainability risk in Sirik was also due to the low catch rate and the fishermen's livelihood. It sounds that management of the illegal fishing and conservation and expansion of the marine protected areas could helpful to improve sustainability of shrimp fishing in Bandar-Abbas fishing-ground. The fuzzy integrated model obtained in the present study prepared spatial prioritization and determined the criteria affecting on shrimp fishing sustainability in the Hormozgan province, which could more guide the managers to improving fisheries sustainability in the region

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This investigation has done to determinate of growth pattern and growth parameters of Austruca sindensis on northern coast of Qeshm Island during January 2017 to December 2018 monthly. Individuals have collected by digging burrow and then fixed in formalin solution 10%. Overall 841 samples collected which included 464 of male crabs (carapace width mean of 12.39±2.17 mm) and 377 of female crabs (carapace width mean of 11.42±1.53 mm). All of morphometric parameters were significantly higher in female than male crabs (p<0.05), except carapace length. The exponential value (b) estimated was obtained 2.78 for male crabs and 2.71 for female crabs. (p>0.05) which indicated positive and negative allometric growth for male and female crabs respectively. In this study, asymptotic carapace width (CW∞), initial hypothetical size (t₀) maximum life span estimated 25 mm, -0.11, 2.3 year for male and 20 mm, -0.10, 1.9 year for female. Also, growth rate (k) and mortality of female were high in comparison to male crabs. Variations in the condition factor were similar for both sexes, and correlated with temperature.