Estimation of the exploitable biomass and the reference biological point, F0.1, of bogue Boops boops L., in the bay of Bou-Ismail, centre Algerian

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Estimation of the exploitable biomass and the reference biological point, F0.1, of bogue Boops boops L., in the bay of Bou-Ismail, centre Algerian

Benina Rachid, Salim Mouffok, Zitouni Boutiba
J. Bio. Env. Sci.5( 2), 420-427, August 2014.
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A study of age and growth of Mediterranean bogue ; Boops boops (Linneaus, 1758) from Algerian Mediterranean bay of Bou-Ismail was carried out during the period from Februaries 2013 to January 2014. Five age groups could be separated by Bhattacharya’s method from length frequency data. Mean length by the end of each year of life (cm) of B. boops from the study area were found to be 13.87, 17.13, 21.49, 24.78, and 27.44 cm for age groups from I to V respectively. The estimated von Bertalanffy growth parameters were L∞= 29.66 cm, K= 0.33 year-1 and t0= 0, W∞=209.79 g .The length-weight relationship was W = 0.016 L2.798. Total mortality (Z), natural mortality (M) and fishing mortality (F) were 1.02, 0.36 and 0.66 year-1 respectively the. VIT software (Lleonart and Salat, 2000) was used to determine biomass, virtual population analysis (VPA), and yield or productivity per recruit. The exploitable biomass of the bogue was estimated at 278.87 tons by the V.P.A. The yield per actual recruit (Y/R = 24.864 g) is very close to the MSY or Ymax /R (25.092 g). This result indicates that the bogue stock is in a state of full exploitation. The biomass per actual recruit (B/R = 55.863 g), which refers to the mean annual biomass of survivors as a function of fishing mortality, is higher than the maximum sustainable biomass (Bmax /R = 48.606 g). Given the state of full exploitation of the bogue stock, an adjustment of the ratio Yactual /R is recommended. To do this, fishing effort is set at F0.1, and the values obtained for Y0.1/R and B0.1/R then correspond to 22.799 g and 80.18 g, respectively.


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