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Boulahdid Mostefa

  • Biodiversity Journal, 9 (1): 019-024

    Chebel Fateh, Mezedjri Lyamine & Boulahdid Mostefa
    Reproductive cycle of the gilthead sea bream Sparus aurata Linnaeus, 1758 (Pisces Perciformes Sparidae) in the Gulf of Skikda (Algerian East coast)

    ABSTRACT
    Specimens of the gilthead sea bream Sparus aurata Linnaeus, 1758 (Pisces Perciformes Sparidae) have been the subject of a study on the reproductive biology in the Gulf of Skikda, which extends from Cape Bougaroune (06°27’10”E) to Cape of Iron (07°10’02”E), from March 2014 to February 2015, in order to describe the sex distribution, sexual cycle and size at first sexual maturity. A total of 576 specimens of which 391 males and 185 females were analyzed. The numerical proportion of males (68%) differs significantly from that of females (32%) (ε> 1.96, α = 5%). The gonadosomatic (GSI) and hepatosomatic (HSI) indices of females and males indicate a single reproduction period. This Spawning period ranges from December to January. Oocyte maturation occurs when the HSI is high. On the other hand, spawning causes a decrease in the HSI. The size at first sexual maturity (Lm50) is 18.3 cm for males and 19.6 cm for females.