Paramètres de croissance et d'exploitation de la carpe blanche Pomadasys jubelini (Cuvier, 1830) dans les complexes lagunaires de Grand-Lahou, Ebrié et Aby (Côte d'Ivoire, Afrique de l'Ouest)

Abstract

Growth and exploitation parameters of the Sompat grunt Pomadasys jubelini (Cuvier, 1830) in Grand-Lahou, Ebrié and Aby lagoons complex (Ivory Coast, West Africa). The growth and exploitation parameters of Pomadasys jubelini (Cuvier, 1830) were studied from January 2007 to December 2008 in Grand-Lahou, Ebrié and Aby lagoons. A total of 2284 specimens (8.50 to 32.70 cm FL) were examined. Length-frequency data collected were analyzed with FiSAT software (FAO-ICLARM Fish Stock Assessment Tool). The demographic structure of P. jubelini was composed of young individuals with a majorant allometric growth. Estimation of growth and exploitation parameters gave: L∞= 33.60 cm; K= 0.53 year-1; t0= - 0,30 year; φ'= 2.78; M= 1.10 year-1; F= 0.26 year-1; E= 0.19 in Grand-Lahou lagoon, L∞= 31.50 cm; K= 0.56 year-1; t0= - 0,29 year; φ'= 2.75; M= 1.21 year-1; F= 0.63 year-1; E= 0.34 in Ebrié lagoon and L∞= 31.50 cm; K= 0.57 year-1; t0= - 0,28 year; φ'= 2.74; M= 1.22 year-1; F= 0.71 year-1; E= 0.37 in Aby lagoon. Pomadasys jubelini stock was more exploited in lagoon Aby than in the other lagoons. The maximum recruitment was observed from July in Grand-Lahou and Ebrié lagoons and May in Aby lagoon.

Keywords

• Pomadasys jubelini
• Growth
• Mortality
• Recruitment
• Ivory Coast