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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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The present study compared the properties of Bighead carp (Aristichthys nobilis) visceral, viscera use of commercial enzymes (Alcalase, Papain, and Protamex), recovery protein and degree of hydrolysis in the various temperatures and times of hydrolysis process. According to results, increase in time and temperature in hydrolysis process, led to increase in both recovery protein and degree of hydrolysis. Maximum of these parameters were observed at 55°C and 60min. minimum of parameters were observed at 35°C and 15min. In addition, among enzymes being investigated, Alcalase had high rate of recovery protein and degree of hydrolysis in equal temperature and times different from others enzymes (Papain and Protamex). Maximum mean of recovery protein for Alcalase was %51.38±2.39 in 55°C and 60 min of hydrolysis process. Also, maximum degree of hydrolysis for Alcalaqse was more than 20% at 55°C and 60 min of hydrolysis process. In conclusion, use of Alcalase enzyme induces product protein hydrolysates from Bighead Carp (Aristichthys nobilis) viscera that have suitable quality than others enzymes (Papain, and Protamex).

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In this study, in order to investigate the effect of Caraway (Carum carvi) on growth parameters and body approximate composition of Huso huso (Linnaeus; 1758) fingerlings, 3 diet containing 10%, 15% and 20% of Caraway with control diet that had not Caraway in its composition was utilized for feeding the Huso huso  fingerlings. Fishes with initial mean weight of 10 g were fed with control diets in 7 weeks and growth parameters including total length, total weight, protein efficiency ratio, feed conversation rate and body approximate compositions were measured and analyzed. Results showed that the diet with 15% Caraway has the best effect on growth parameters of Huso huso fingerlings and lead to more gaining weight (146.60±1.85 g) than other diets. Moreover, between body approximate compositions, only the protein and moisture level were affected by diets containing Caraway. Maximum protein was observed in fingerlings fed with diets containing 10% and 20% Caraway. According to obtained results, using the diet with 15% Caraway recommend in order to enhance growth of Huso huso fingerlings.