Distributed in iskenderun baylessepsianfish speciesdetermination of the availability in catch and trawl cod selectivity

Conducted in September 2013 in the Gulf of Iskenderun in this study, lessepsian species availability of the catch and trawl codend selectivity were investigated. Operations at three different depth contours (0-20m, 20-40m and 40-60m) were made. From field studies a total of 56 Osteichthyes, 6 Chondrichthyes, 11 Crustacea, 2 Bivalvia, 2 Echinodermata, 2 gastropods, 1Cephalopo and1 Gastropoda species were found. The obtained results; caught 55% of Osteichthyes biomass showed lessepsian of species. Selectivity curve only S.undosquamis, N. Randalli and E. klunzingeri could be drawn for the species. The obtained results for these three species, the selectivity factor, respectively 8.10, 4.24 and 3.01 showed. Also in the same order L50% value; was determined to be 22.18cm, 9.33cm and 6.62cm. And in addition to this U.pori, U.moluccensis economic lessepsian species as the proportion of individuals of particularly great height has been found to be extremely low.