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Abundance and distribution of Veneridae family in the Hendijan coast, Khuzestan province (Persian Gulf) were studied in a period from summer 2005 to spring 2006. Sampling was done seasonally with vanveen grab from 5 stations. Stations were located 0.5 mile apart and samples were collected from approximately 8 m depth . In this study 5 species of Veneridae were identified: Circenita callipyga, Gafrarium pectinatum, Bassina calophylla, Paphia gallus and Paphia textile. The abundance and percentage of frequency for each species were measured . The highest frequency of occurrence was observed in Circenita callipyga with ratio 88.69% and abundance 8668 No m-2 and other species had low ratio. Juveniles had 9.93% in ratio and 971 No m-2 in abundance. The effect of temperature, salinity and particle size of sediment as three main environmental parameters on benthos frequency were investigated. Significant relation was found in frequency and particle size between 63-125 micrometer but there was no significant relation between frequency and other factors. Diversity indices showed poor diversity of Venerid population in the north of the Persian Gulf.

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Food diet of Mudiskipper Fishwas considered seasonally ,in samaeily creek of mahshahr ,from Creek System of Musa Bayduring an Annual duration from Summer 2008 to the Spring 2009.Fishes were captured using Sachook and air gun.After fish caught and incision of biological samples ,the identification of food types of the gut contents were taken into consideration.the results of such biological analysis from 85 mudskipper individuals belonged to Periophthalmodon schlosseri species,with Average Total Body Length of:10.07±0.27cm ,the Average weight of :8.75 ±0.67 gr, Average ( RLG) Index of Intestine being at:0.96±0.0.04 (0.52-1.45).Therefore this species is considered as carnivorus ,where according to gut content Analysis,the main food diet of this species during the study time has been crabs,where miscellaneous food intake according to their percentage of occurrence respectivey were shells,insect and the least accidental intake was prawn.

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Three practical diets containing increasing percentages of crude protein (CP) (30%, 35%, and 40%) were fed to juvenile narrow claw crayfish (mean individual weight=15±2.3 g) during 8-week feeding trial. Growth, feed conversion ratio and body composition of tail-muscle meat of juvenile narrow claw were determined. The percent weight gain of narrow claw fed a diet containing 30% crude protein was higher (14.28%) than that of narrow claw fed a diet containing 35% crude protein (14.24%) and 40% crude protein (12.81%). Narrow claw fed Diet 3 had higher FCR (10.56) compared to narrow claw fed the other two diets. Results from this study indicate that juvenile narrow claw can be fed a practical diet containing 30% CP. Reducing CP levels in Iranian narrow claw diets may help reduce operating costs and thereby increase producer’s profits.

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In this study the effect of five experimental diets and iso nitrogenic and iso energic with different protein sources with 4 replications for each treatment of narrow claw crayfish in a total of 15 aquariums in the form of a completely randomized design were evaluated. The main sources of supply of fish protein meal (F) and soy bean (S) and gradually from 100 percent fish meal diet with 100 percent soy bean was replaced. Experimental diets included F70/S30, F30/S70, F50/S50, F0/S100 and F100/S0. The results showed that diets F70/S30 F100/S0 and better results in weight gain, specific growth rate, the coefficient of utilization of protein, feed conversion and daily food consumption was been. There are no significant differences between diets F70/S30 F100/S0. In terms of economic justification for making commercial diets fed F70/S30 recommended.

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Investigation of Diet biology of Nemipterus japonicas in Persin Gulf waters (Hormozghan Beaches) was performed since November 2010 until July 2011. In this Investigation biometry and feeding of 160fishes were studied. Stomach Fullness of Index (FI), Vacuity Index (VI), Food Preference Index (FP), Gastro Somatic Index (GSI), Condition Factor (CF) was calculated according to the computer software Excel and for statistical Ievels, SPSS software was used. In this study the average Length for this species was 208.54 ml and weight average was 159.20 gr. It was observed that females were greedier than males. Study of the presence of prey abundance index (J) in the stomach of N EMIPTERUS JAPONICUS, ABUNDANCE INDEX FOR Squilla mantis (Stomatopoda) was 60.67% that as the main food of fish is considered. Abundance index were 41.57% Crabs, 28.08% Shrimps, 26.96% Fishes, 14.60% Amphipoda, 13.48% Mollusca, 12.35% Brittle Stars and 11.23% Nematode that they are side food for this species. Other food groups like Copepod with abundance index 4.49%, fish egg 4.49%, Euphausiacea 1.12% ND Polychaete 1.12% were random food for species.

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Common Kilka are distributed along the Caspian Sea, but at the depth less than 50m has more density. The fish is caught in commercial fisheries, but unlike previous decades, it is the main catch in the coasts of Iran. This study was conducted in the Kilka commercial catch area around the Anzali Port. A diet survey was conducted on 320 individuals of Kilka from summer 2011 to spring 2012, seasonally. The weight, length and age showed variation with 5.15-14.29 g (9.30±1.66) 8.3-12.9 cm (11.27±0.75) and 3-7 old years (4.82±0.86). The results showed that 26.87% of common Kilka had empty tract, and Copepods, Balanidae (Balanuscypris and larvae), Cladocera, Parasites (Nematoda&Trematoda) and Azolla were observedin the gut of fish.The number of prey were 94.5, 3.0, 1.8 percent for Copepods, Balanus(larvae) and Balanus(cypris), respectively and copepods with 61.6 percent as main food, Balanus(cypris) with 48.3 percent as second food item were considered. Also the other types of food were consumed randomly. For common Kilka the relative length of gut 0.73±0.11 and fullness intensive index 115.01±63.01 were estimated. The frequency of prey, fullness intensive index and relative length of gut did not show differences in unlike seasons and ages. In a conclusion, it can be expressed that in comparison with last studies, diversity of food for this fish was more limited, also fullness intensity index was decreased.

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In this study, diet of three most common Sea star, Asteropecten indicus, Asteropecten polyacanthus phragmorus and Asterina burtani from Chabahar coastal area were examined. Sampling of Sea star were carried out during 6 months from sandy-silt substratum of intertidal zone of Tis coast (Eastern part of Chabahar port) and also from of subtidal zone 10m depth of Ramin area (western part of Chabahar port) from October to March 2014-15. Stomach contents from 15-25 individuals of A. indicus, A. polyacanthus phragmorus and 53 individuals of A. burtani species were examined. In Sea stars A. indicus 90 specimen preys and in A. polyacanthus phragmorus 44 specimen preys were observed. The preys in A. indicus comprise 16 species and in A. polyacanthus phragmorus comprise 10 species. The dominant prey in the stomach of A. indicus (96.7%) and in A. polyacanthus phragmorus 97.7% were Mollusca, while crustacean accounted for 3.3% and less than 3% in the stomach of the two species, respectively. During the field observations of 53 examined individual of A. burtani species, 50 individual (approximately 94.3%), bring out their cardiac stomach and were being fed. 92% of Sea star consumed microscopic organisms that live on rocky surfaces, including 42% of the sponges and the rest percentage belonging to the Asidian and Nudibranches with similar percentage. According to result of this study A. indicus and A. polyacanthus phragmorus species are as key species in population control for several species of gastropod and bivalve. This control would have a beneficial effect on the populations of small mollusks. It can also be expected that A. burtani by feeding on prey with high abundance play important role in the stability of the food web.

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This study was conducted to investigate the dietary habits of Caspian bighead goby (Ponticola gorlap) in Anzali wetland. For this purpose, 70 goby were collected from four stations in different parts of Anzali Wetland by cone nets (fyke net) during December 2014 to April 2015. The contents of the gastrointestinal tract were examined using the occurrence method of Numerical methods. Condition factor, prey abundance, Vacuity Index, Food preference Index and Food preference Index were studied. The results show that The minimum and maximum lengths of the studied fish were 9.52 cm and 17.80 cm, respectively, and the minimum and maximum recorded weights were 13.43 and 64.61, respectively. The relationship between fish length and weight was W = 0.032TL ^2.68. Condition factor ranged from 1.35 to 1.47 in the study months but did not show a significant difference (P>0.05). In terms of prey frequency, crustaceans (river shrimp, Macrobrachium nipponense) accounted for 58.14%, bony fish (Cyprinidae) 9.3%, insects (Chironomide) with 4% and uncertain mass 30% of the total prey. Index of Vacuity Index showed that the Caspian bighead goby is a gluttonous species in cold seasons. Gastro-somatic Index in different months did not show a significant difference (P>0.05), but its rate was low throughout the period. In terms of Food preference Index of river shrimp with 74.19% as the main food, bony fish (Cyprinidae) with 12.9% as a secondary food and chironomidae with 3.23% as accidental feed of goby in the studied months were determined. The results show that the diet of Caspian bighead goby in the study period is limited but the Gastro-somatic Index is high, also according to the type of feeding, can be an inhibitory factor for non-native river shrimp in the wetland.