Population Dynamics of Horse Mackerel (Trachurus trachurus L., 1758) Stocks in the Mid Black Sea, Turkey

Authors : Şennan YÜCEL, İbrahim ERKOYUNCU

Pages : 543-552

View : 31 | Download : 7

Publication Date : 2000-12-01

Article Type : Research Paper

Abstract :The aim of the present study, which was carried out on 720 individuals between October 1995 and September 1996 in the mid Black Sea region was to estimate some parameters of the population of horse mackerel insert ignore into journalissuearticles values(Trachurus trachurus L. 1758); including age, size, weight, sex compositions, growth and mortality rates. Ages between 0 and 7 were established in horse mackerel stock. The weight-length relationship was calculated as; W= 0.00759L 3.05 , condition factor 0.843 and the Von-Bertalanffy growth formulas were, Lt= 16.92 insert ignore into journalissuearticles values(1- -0.3538 insert ignore into journalissuearticles values(t+2.7938); ); Wt= 47.11 insert ignore into journalissuearticles values(1-e -0.3538 insert ignore into journalissuearticles values(t+2.7938); ); 3.05 . Instantaneous total mortality coefficient, natural mortality coefficient, fishing mortality coefficient, survival rates, annual mortality rates, expectation of natural mortality, expectation of fishing mortality and the exploitation ratio were estimated to be Z= 1.55, M= 0.555, F= 0.995, S= 0.22, A= 0.78, v= 0.28, u= 0.50 and E= 0.64, respectively.
Keywords : Trachurus trachurus, Black Sea, Population Dynamics