Etude de la croissance de la langouste rouge Palinurus elephas dans les eaux tunisiennes

Abstract

These have been estimated for Palinurus elephas by the size frequencies analysis method. The method of marking-recaptures, the more counseled in the growth survey for big crustaceans, didn't give for different reasons a satisfactory results. ELEFAN I program was applied to estimate LC∞, K, to, C and WP. They are respectively 155,84 mm of LC, 0,22 year-1, -0,25 years, 0,3 and 0,5 for females and 201,56 mm of LC, 0,16 year- 1, -0,27 years, 0,3 and 0,5 for males. The modeling was achieved by the model of Von Bertalanffy with and without seasonality of the growth. A graphic representation of the growth in staircase has been done according to the relative growth (during molt) and the absolute growth described by the model of Von Bertalanffy. The data presented here provide a useful starting point for the assessment and the management of Palinurus elephas stock in Tunisian waters. This resource socioeconomically very important undergoes an excessive fishing which can cause its overexploitation.