PP-418 Population Parameters of the Black Sea Brill Scophthalmus maeoticus (Pleuronectiformes, Scophthalmidae) from Duzce, West Black Sea Serpil KARAN, Ali UYAN, Servet Ahmet DOĞDU, Mevlüt GÜRLEK, Cemal TURAN Molecular Ecology and Fisheries Genetics Laboratory, Department of Marine Sciences, Marine Sciences and Technology Faculty, Iskenderun Technical University [email protected] Aim of the study: The Black Sea brill Scophthalmus maeoticus is an economically important flatfish species belong to the family of Scopthalmidae, and there is a considerable interest in this species with respect to fisheries and aquaculture. S. maeoticus occurs in the Black Sea and Marmara Sea. Until this time, there has not been any study about growth features of the Black Sea brill S. maeoticus. In the present study, length-weight relationship and growth parameters of S. maeoticus from Duzce (West Black Sea) were studied. Material and Methods: A total of 201 brill samples, of which 118 female and 83 male, were taken from the Duzce between October 2013 and December 2014 by commercial fisheries. Results: All sampled Black Sea brill varied between 16.3 and 45.8 cm for females and 16.4 and 44.1 cm for males in length. In weight, females varied between 118 and 1500 g, males varied between 120 and 1350 g. Maximum age was found to be 4 years for both sexes. The length-weight relationship was described as W=0.0887 x L2.5361, W=0.1254 x L2.4392 and W=0.1028 x L2.4947 at females, males and both sexes, respectively. The parameters of von [-0.141333 Bertalanffy growth equations for Black Sea brill were determined as Lt= 82.67071 [1-e (t +1.59538)] [-0.217783 (t + 1.38313)] [-0.169011 (t + 1.51068)] ]; Lt= 63.8835 [1-e ] and Lt= 73.94855 [1-e ] for females, males and both sexes, respectively. Acknowledgements: Thanks to the Scientific & Technological Research of Turkey (TUBITAK – 112O920) for financial support. Keywords: Black Sea brill, Scophthalmus maeoticus, length-weight relationship, growth parameters, Black Sea, Duzce. 605 The 3rd International Symposium on EuroAsian Biodiversity 05-08 July 2017, Minsk - BELARUS .