Population dynamics and biological characteristics of kilka species (Pisces: Clupeonidae) in southeastern coast of the Caspian Sea
نویسندگان
چکیده مقاله:
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 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, respectively. The results suggest that common kilka stock is under over-fishing now.
منابع مشابه
A comparative study on reproduction of kilka species (Clupeidae) in southeastern parts of the Caspian Sea
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متن کاملA comparative study on reproduction of kilka species (Clupeidae) in southeastern parts of the Caspian Sea
The aim of the present study was to investigate the reproduction of three species of kilka, including common, anchovy and bigeye kilka in the southeastern waters of Caspian Sea. This study was conducted during 2010 and 6476 specimens were fortnightly collected from fishing landing site. Body weight and fork length were measured. The samples were dissected and female gonads were weighed. Sexual ...
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عنوان ژورنال
دوره 9 شماره 3
صفحات 422- 433
تاریخ انتشار 2010-09-01
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