Abstract
The aim of the present study was to investigate the age structure, length-weight relationship,
sex ratio, sexual maturity stages, growth parameters, natural and fishing mortality coefficients
of three species of kilka, including common, anchovy and bigeye kilka. The fork length–
weight relationship of common, anchovy and bigeye kilka were calculated as W=0.000153
FL2.37, W=0.000349 FL2.18 and W=0.00160 FL2.97, respectively. The parameters of the von
Bertalanffy growth curve for length were L = 143.5 mm, K = 0.30 yr-1 and t0 = -1.02 yr for
common kilka; L = 151.9 mm, K = 0.28 yr-1 and t0 = -1.12 yr for anchovy kilka and L =
148.6 mm, K = 0.46 yr-1 and t0 = -0.18 yr for bigeye kilka. The instantaneous coefficient of
natural mortality of common, anchovy and bigeye kilka were estimated as 0.671, 0.633 and
0.881 yr-1, respectively. The current exploitation rates of three species were estimated as 0.55,
0.41 and 0.26 for common, anchovy and bigeye kilka, respectively. The results suggest that
common kilka stock is under over-fishing now.
