توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Population dynamics and biological characteristics of kilka species (Pisces: Clupeonidae) in southeastern coast of the Caspian Sea
نویسنده(ها): ،
اطلاعات انتشار: IRANIAN JOURNAL OF FISHERIES SCIENCES، نهم،شماره۳، Sep ۲۰۱۰، سال
تعداد صفحات: ۱۲
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.
نمایش نتایج ۱ تا ۱ از میان ۱ نتیجه