Etude de la fécondité de Diplodus vulgaris (Teleosteen, Sparidae) du Golfe de Gabes (Tunisie)

Abstract

The study of the general biology of species requires a full treatment of reproduction and its features via the determination of sex with different stages of maturity, duration of the spawning season, size at first sexual maturity, strategy of reproduction and the estimation of fecundity. Absolute fecundity, fertility or on individual as well as reproductive capacity have been the subject of this study, based on a sample of 67 females in advanced stage of maturity of two banded seabream, Diplodus vulgaris (E. Geoffroy St. Hilaire, 1817) collected on the southern Tunisia coasts sizes (LT) between 14.2 and 25.4 cm. The number of oocytes per ovary was then determined to calculate the relative fertility per gram of fish gonads. D. vulgarishas an average absolute fecundity of 15437 ± 1126 eggs, a relative fecundity of 162 eggs per gram of fresh fish and 3441 eggs per gram of gonads.