علوم زیستی دریا
s h; t v
Abstract
In order to estimate the biomass of demersal in a part of Khouzestan and Boushehr waters (North- West Persian Gulf), a research Survey was carried out by using R/V Ferdows 1covering the depths 10-20, 20-30 and >30m. Study area was stratified into 2 strata(A, B) and 32 stations selected randomly and ...
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In order to estimate the biomass of demersal in a part of Khouzestan and Boushehr waters (North- West Persian Gulf), a research Survey was carried out by using R/V Ferdows 1covering the depths 10-20, 20-30 and >30m. Study area was stratified into 2 strata(A, B) and 32 stations selected randomly and were sampled by Swept Area method. 44, 43, 54 and 36 species were identified in substrata A1 , B1 , B2 and B3, respectively. Catch Per Unit of Area and biomass in substrata A1 , B1 , B2 and B3 were 2396, 3102, 4942, 7904 kg/nm2 and 1198, 1292, 2471, 3952 kg, respectively. The maximum and minimum biomass belong to Upeneus sulphureus(1269kg), Nemipterus Japonicus(857kg) and Apogon sp. (2.23kg), Scorpion sp.(4.18kg) species, respectively. Total biomass in the area was estimated 9015 kg of which 6491 kg was non- commercial. A decrease of fishing effort should seriously be taken into consideration.
Abstract
The present study was carried out in two Station in Costal of the Khuzestan province (including Abadan, and Hendizan) using the commercial catch data. This project one year during 2007-2008, in addition over 2300fish caught was biometry. The growth and mortality parameters of Silver pomfert, infinity ...
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The present study was carried out in two Station in Costal of the Khuzestan province (including Abadan, and Hendizan) using the commercial catch data. This project one year during 2007-2008, in addition over 2300fish caught was biometry. The growth and mortality parameters of Silver pomfert, infinity length, L∞: 35.5., growth curvature, K: 0.56., length in zero time, t0: - 0.32., total mortality, Z: 3.06., natural mortality, M: 1.07., fishing mortality, F: 1.99 and Exploitation ratio, E: 0.65 respectively were estimated. By used analysis method, Y'/R = 0.019, B'/R=0.10, Exploitation rate, U: 0.61, MSY= 440 T and MCY=290 T were estimated respectively. Result in this study showed exploitation ratio the Silver pomfert stock is over fishing and decrease exploitation ratio proposed.