Tropicultura (Jan 2018)
Relation régime alimentaire-stade de maturité sexuelle chez le listao (Katsuwonus pelamis Linnaeus, 1758) débarqué au port de pêche d'Abidjan en Côte d'Ivoire
Abstract
Relationship Diet-sexual Maturity Stage in Skipjack Tuna (Katsuwonus pelamis, Minnaeus 1758) Landing at the Abidjan Fishing Port in Côte d'Ivoire. A study on the variability of the diet according to the state of sexual development was carried out in order to highlight the relationship that might exist. Thus, a sample of 170 skipjack tuna from the commercial catches of the fishing port of Abidjan in Côte d'Ivoire, was collected during the year 2016. After measurements, the gonads were taken out for the observations of the stages and the stomach content was analyzed in order to determine the diet. The relative importance index (RII) combining different percentages was used to classify the prey according to the preferences of the different stages. Out of the total of 170 individuals, 85 were females, 76 were males and 9 were undetermined. The items found in the stomach of Katsuwonus pelamis were Trichuridae, Moronidae, Scombridae, Clupeidae and Crustacea. Females of stage I had as preferential prey the Clupeidae and those of stage IIthe Trichuridae. However, in stages IV and V, they had respectively as preferential prey Trichuridae and Moronidae. For the males, the preferred prey of Stage I and Stage IV were Trichuridae. For the Stage II and III the preferential prey were Trichuridae and Scombridae.
