Growth and exploitation parameters of Oreochromis niloticus (Linné, 1758) in Guessabo Lake (Middlee - West: Côte d’Ivoire).
1 Department of Environment, Jean Lorougnon Guédé University, Daloa city (Côte d’Ivoire) P.O. Box 150 Daloa, Côte d’Ivoire.
2 Department of Agrororestry, Jean Lorougnon Guédé University, Daloa city (Côte d’Ivoire) P.O. Box 150 Daloa, Côte d’Ivoire.
3 Training and research Unit of Marine Sciences, San Pedro University, San Pedro City (Côte d’Ivooire) 01 P.O. Box 1800, Côte d’Ivoire.
Research Article
International Journal of Scientific Research Updates, 2023, 06(01), 024–032.
Article DOI: 10.53430/ijsru.2023.6.1.0053
Publication history:
Received on 03 June 2023; revised on 17 July 2023; accepted on 20 July 2023
Abstract:
Growth and exploitation parameters of Oreochromis niloticus were determined in Guessabo Lake. The study involved 515 individuals of Oreochromis niloticus collected monthly between August 2019 and July 2020. The values of the asymptotic length (L∞), growth coefficient (K) and growth performance index (Φ') are 21.57 cm; 0.93 yr-1 and 2.66, respectively. The values of total (Z) natural (M) and fishing (F) mortality obtained in this study for the species Oreochromis niloticus are 2.84 yr-1, 1.82 yr-1 and 1.02 yr-1 respectively. The operating ratio E is 0.36. The Z/K and M/K ratios are 3.05 and 1.95 respectively. The results show that natural mortality predominates over fishing mortality. Recruitment occurs twice a year with peaks in June and July.
Keywords:
Growth and exploitation parameters; Oreochromis niloticus; Guessabo Lake; Côte d’Ivoire
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