Growth, mortality, exploitation rate and recruitment patterns of Gerres nigri Günther, 1859 from Saloum estuary, Senegal

Alioune Faye; Alassane Sarr; Malick Diouf; Waly Ndiaye; Jean Fall; Ousmane Diankha

doi:10.22034/ijab.v11i4.1993

Authors

Alioune Faye
[email protected]
Institute of Environmental Sciences, Faculty of Science and Technology, Cheikh Anta Diop University of Dakar, Dakar, Senegal. https://orcid.org/0009-0006-8851-4592
Alassane Sarr University Institute of Fisheries and Aquaculture, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
Malick Diouf Department of Animal Biology, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
Waly Ndiaye University Institute of Fisheries and Aquaculture, Cheikh Anta Diop University of Dakar, Dakar, Senegal
Jean Fall University Institute of Fisheries and Aquaculture, Cheikh Anta Diop University of Dakar, Dakar, Senegal.
Ousmane Diankha Department of Hydrosciences and Environment, Faculty of Science and Technology, Iba Der Thiam University of Thies, Senegal.

Vol. 11 No. 4 (2023): August

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August 25, 2023

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The population parameters of Gerres nigri Günther, 1859 from the Saloum estuary in Senegal were studied from September 2017 to January 2018. A total of 591 individuals were collected monthly by experimental beach seine. The monthly length-frequency data (total length in cm) were obtained and analysed using the FiSAT II software and its sub-program ELEFAN for the evaluation of population parameters. Asymptotic length (L?) and growth coefficient (K) were estimated at 22.1 cm and 1.5 yr^-1, respectively. The growth performance index (?’), longevity (t_max), and the theoretical age at birth (t₀) were calculated as 2.86; 2.827 yr, and -0.11 yr^-1, respectively. Total mortality (Z), natural mortality (M), and fishing mortality (F) were calculated at 3.57 yr^-1, 2.48 yr^-1, and 1.09 yr^-1, respectively. The probability of capture was calculated as L₂₅= 13.45, Lc = 14.34 and L₇₅= 15.08 cm. The recruitment pattern is a continuous two-peak model, with the minor peak occurring in May and the major peak occurring in August. The current exploitation rate (E_current) and maximum exploitation rate (E_max) were calculated as 0.31 and 0.421, respectively. Further, the current rate of exploitation of G. nigri was slightly lower than the maximum exploitation rate. The results showed that the G. nigri stock was not overexploited.

Faye, A., Sarr, A., Diouf, M., Ndiaye, W., Fall, J., & Diankha, O. (2023). Growth, mortality, exploitation rate and recruitment patterns of Gerres nigri Günther, 1859 from Saloum estuary, Senegal. International Journal of Aquatic Biology, 11(4), 279–287. https://doi.org/10.22034/ijab.v11i4.1993

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