Species composition of bycatch trawl commercial trawler from fishing grounds in Hormozgan province

This study was conducted for estimation of bycatch shrimp trawl from fishing grounds of Hormozgan province. Sampling operation was carried by commercial trawler around Hormoz and Qeshm Island during fishing season in October and November 2012. Towing duration was between 1 to 3. 5h (2±0. 08h). Contribution of bycatch and target species was 86. 26% (18918. 80 kg) and 13. 74% (3014. 22kg) respectively. By-catch-to-shrimp ratio was estimated 6. 27. Small discard species، large discard species، commercial species and target species were constituted 68. 02%، 3. 35%، 14. 7%، 13. 74% of total catch respectively. In this study، species composition included 103 species belonging to 64 families that include 77 teleost species from 47 families، 13species elasmobranchia from 9 families، 3species invertebrate from 3 families، 4 species Penaeid shrimps and sea turtle، sea snake and sea stare. The results of this research indicate fishing pressure on commercial and non commercial species in this region. The little long term information exists for Bycach species shrimp trawl that used for conventional population models. The results of this study can be used for assessment damages shrimp trawl fisheries on the resources of the Persian Gulf and the ecological risk assessment models.