Reproductive biology of Trichiurus lepturus (Perciformes: Trichiuridea) in the coastal waters of Cote d’Ivoire
Paper Details
Reproductive biology of Trichiurus lepturus (Perciformes: Trichiuridea) in the coastal waters of Cote d’Ivoire
Abstract
Trichiurus lepturus remains a highly exploited species by the industrial and artisanal fisheries in Cote d’Ivoire. But there is no formally established fishery, in addition to the limited information on aspects of its biology in this area. This work was carried out to determine its reproductive aspects for fishery management. The whole sample consisted in 876 specimens with size ranging from 38-104 cm in total length were taken at the harbour of Abidjan between January 2018 and December 2018. The sex was determined for all specimens. The sizes at first sexual maturity (L50) were estimated by means of logistic function that was fitted to the proportion of the mature individuals using a nonlinear regression. The reproductive period was established by analysing the temporal evolution in the frequency of the maturity stages and monthly variations in the gonadosomatic index (GSI). The sex ratio (F: M) of 1:0.93 was not significantly different between sexes (χ²= 0.89, p˃ 0.05). The length at first maturity was 45.81 cm for females and 50.23 cm for males. The higher values of GSI occurred in March-June and August-November. The absolute fecundity ranged from 3408 to89975 oocytes. The frequency distribution of oocytes diameters was unimodal (stage 4 and 5) and three mode (stage 3).
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