Population Dynamics of Little Tunny (Euthynnus alletteratus, Rafinesque, 1810) exploited in the Gulf of Guinea,Ivory Coast
Journal Title: Saudi Journal of Medical and Pharmaceutical Sciences - Year 2018, Vol 4, Issue 3
Abstract
Abstract:The population structure, growth, mortality and exploitation status of Euthynnus alletteratus were examined in the Gulf of Guinea between January 2015 and December 2016. Monthly length frequency data of Euthynnus alletteratus were analyzed by FiSAT II software for estimation of population parameters which include asymptotic length (L∞), specific growth level (K) and recruitment pattern to evaluate the status of the stock. Asymptotic length was 100.8 cm, and specific growth level was 0.07 yr-1, value was too low, while the growth performance index was 2.85.Total mortality (Z) by length-converted catch curve was estimated at 0.82 yr-1, fishing mortality (F) 0.61yr-1 and natural mortality (M) 0.21 yr-1. The recruitment pattern was continuous all the year with two peaks of unequal importance: the secondary appears between March and April while the main is observed from July to August. The exploitation level (E) of Euthynnus alletteratus was 0.74 that on the maximum allowable limit of exploitation (Emax) which was 0.42. The exploitation level (E>0.50) indicates that the fishing pressure on Euthynnus alletteratus is very high. Thus the status of the stock in the Gulf of Guinea seems to be surexploited. Keywords:
Authors and Affiliations
DIAHA N’guessan Constance, ANGUI Kouamé Jean Paul, GUILLOU Aurélie Marie
Keywords
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