:: Volume 9, Issue 3 (2010) ::
IJFS 2010, 9 Back to browse issues page
Population dynamics and biological characteristics of kilka species (Pisces: Clupeonidae) in southeastern coast of the Caspian Sea
G. Karimzadeh *, B. Gabrielyan, H. Fazli
, karimzadehg@yahoo.com
Abstract:   (10686 Views)

  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.

Keywords: Clupeonella cultriventris caspia, C. engrauliformis, C. grimmi, Growth, Sexual maturity stage
Full-Text [PDF 349 kb]   (4040 Downloads)    
Type of Study: Orginal research papers | Subject: Stock assessment
Received: 2010/07/26 | Accepted: 2015/09/13 | Published: 2015/09/13

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Volume 9, Issue 3 (2010) Back to browse issues page