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 hormozganprovince.sampling operation was carried by commercial trawler around hormoz and qeshm islandduring 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, largediscard 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 belongingto 64 families that include 77 teleost species from 47 families, 13species elasmobranchia from 9families, 3species invertebrate from 3 families, 4 species penaeid shrimps and sea turtle, sea snake andsea stare. the results of this research indicate fishing pressure on commercial and non-commercialspecies in this region. the little long term information exists for bycach species shrimp trawl that usedfor conventional population models. the results of this study can be used for assessment damagesshrimp trawl fisheries on the resources of the persian gulf and the ecological risk assessment models.