| Titre |
Growth, Mortality and Exploitation of the African Lesser Threadfin Galeoides decadactylus (Pisces, Polynemidae) Fishing by the Gill Net "Soovi" in Benin Nearshore Waters |
| Auteurs |
SOSSOUKPE EDMOND [1],
ADITE ALPHONSE [3],
FIOGBE EMILE DIDIER [4],
|
| Journal: |
Journal of FisheriesSciences.com |
| Catégorie Journal: |
Internationale |
| Impact factor: |
0.714 |
| Volume Journal: |
10 |
| DOI: |
http://www.fisheriessciences.com |
| 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 |
| Fichier |
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