The Structure, Mortality and Growth of the Tench [Tinca tinca (L., 1758)] Population in Çivril Lake, Denizli, Turkey

Authors: SÜLEYMAN BALIK, HASAN M. SARI, MUSTAFA RUŞEN USTAOĞLU, ALİ İLHAN

Abstract: The population structure, mortality and growth of the tench [Tinca tinca (L., 1758)] in Çivril Lake was investigated, using 506 fish caught with various gill nets between February 1998 and January 1999. The percentages of females and males in the population were 38.34% and 61.66%, respectively, and the overall female-male sex ratio was 1:1.61. Specimens ranged from 11.4 to 28.8 cm in fork length, and from 27.7 to 420.4 g in weight. The age distribution was I-V in the population. For all individuals, the length-weight relation and von Bertalanffy growth parameters were W = 0.018 L^{3.01}, and L_{\infity} = 33.85 cm, W_{\infity} = 723.18 g, k = 0.284 year^{-1} and t_0 = -0.895 year, respectively. The rates of total mortality, natural mortality and fishing mortality were 60.46%, 30.19% and 30.27%, respectively.

Keywords: Tench, Tinca tinca, population structure, mortality, growth, Çivril lake

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