Biology of the Reproduction of Mugilidae Neochelon falcipinnis (Valenciennes, 1836) in the Protected Marine Area of Niamone-Kalounayes (Casamance Estuary)

Abstract

The reproduction of Neochelon falcipinnis was studied in the Marine Protected Area (MPA) of Niamone-Kalounayes located in the Casamance estuary (Senegal) from July 2021 to June 2022. The results of this study are presented after twelve (12) months of experimental seine fishing. Reproductive parameters such as length-weight relationship, condition factor (K), sex ratio (SR), gonadosomatic index (GSI) and size at first maturity (Lm50) were determined. A total of 386 individuals (150 males, 221 females and 15 of undetermined sex) were sampled. The sex ratio was in favour of females (0.68 or 1:1.47). The length-weight relationship showed a minor allometric growth with allometric coefficient b values of 2.70 for both sexes combined, 2.60 for males and 2.79 for females. The ANOVA test showed no significant difference in condition factor in males (P > 0.05). In contrast, in females, there was a significant difference at the beginning of the cold season (P < 0.05). The monthly change in gonadosomatic index associated with the different stages of sexual maturity indicated a breeding period in the dry season (May, June and July). Peaks of sexual maturity are observed in June for both sexes. Sizes at first sexual maturity were 18 cm for males and 19 cm for females. These results, obtained provide information on the reproduction of Neochelon falcipinnis that can help in decision-making for better management of the resource.