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

Article Type:
Research/Original Article (دارای رتبه معتبر)

The population parameters of Gerres nigri Günther,1859from 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 (Φ’), longevity (tmax), and the theoretical age at birth (t0) were calculated as 2.86; 2.827yr, and -0.11yr-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 (Ecurrent) and maximum exploitation rate (Emax) 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. nigristock was not overexploited.

International Journal of Aquatic Biology, Volume:11 Issue: 4, Aug 2023
279 to 287  
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