Publications Scientifiques

[ Article ] Growth, Mortality and Exploitation of the African Lesser Threadfin Galeoides decadactylus (Pisces, Polynemidae) Fishing by the Gill Net "Soovi" in Benin Nearshore Waters

Date de soumission: 14-02-2018
Année de Publication: 2016
Entité/Laboratoire Laboratoire de Recherche sur les Zones Humides (LRZH)
Document type : Article
Discipline(s) : Sciences Aquatiques & océanologie
Titre Growth, Mortality and Exploitation of the African Lesser Threadfin Galeoides decadactylus (Pisces, Polynemidae) Fishing by the Gill Net "Soovi" in Benin Nearshore Waters
Journal: Journal of
Catégorie Journal: Internationale
Impact factor: 0.714
Volume Journal: 10
Resume The African lesser threadfin, Galeoides decadactylus, is one of the fish species commonly caught in the nearshore waters of Benin. It is well appreciated for the quality of its flesh. But since these twenty past years, the African lesser threadfin’s production has been decreasing with more small-sized fishes appearing in catches, and little is known about the species’ population dynamics. Therefore, the growth and mortality parameters of the lesser African threadfin off Benin’s near shore waters were investigated using length–frequency data of 1027 specimens sampled from Gill net hauls over a period of 12 months. The length–weight relationship was computed from linear regression analysis. Galeoides decadactylus exhibited negative allometric growth (b = 2.955 ≠ 3; p < 0.05) with an abundance of small sized specimens. The von Bertalanffy growth constants for Galeoides decadactylus were TL∞ = 26.25 cm, K = 0.800 yr-1, and t0 = -0.60 yr with a derived growth performance index of ϕ =2.741.The instantaneous rates of total mortality (Z), natural mortality (M), and fishing mortality (F) were respectively 1.88, 1.64 and 0.24 per year. The rate of exploitation (E = 0.13) showed an under-fishing of this species. This fishery could be well managed by increasing the fishing effort. Decreasing of the African lesser threadfin population in the catches could be attributed to other factors.
Mots clés Galeoides decadactylus; Benin; Gill net; Sex-ratio; Growth parameters; Mortality
Pages 31 - 37

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