Author(s): Alla Eby Yoboué Gnamma Honorine, Kouakou Kouassi Fidèle, Séka Dagou and Adepo-Gourène Abouo Béatrice

Abstract: The reproductive features of the fish Liza dumerili were studied for one annual period in the sector III of the Ebrié lagoon from south-eastern Côte d’Ivoire. Overall, an annual population comprising 141 males, 232 females, and 74 unsexed immatures were collected. The sex ratio was 1:1.64 in favour of females. The theoretical sex ratio (1:1) and the observed sex ratio within the population of L. dumerili differed significantly (X² = 5.974; p<0.05). At the level of the first sexual maturity, the mean of male fork lengths reached 242 mm while measurements of this morphological character in females were 245 mm. The monthly evolution of the gonado-somatic index (GSI) associated with sexual maturation stages are a hint that L. dumerili mainly reproduces in the rainy season, in particular between April and June. The absolute fecundity in females varied from 112 095 to 920 356 oocytes and corresponded to individuals having their fork lengths comprised between 209 and 335 mm. Meanwhile, the relative fecundity weighed between 1156 and 1247 oocytes/g.

Pages: 521-527  |  675 Views  137 Downloads

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