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Chebel Fateh

  • Biodiversity Journal, 9 (1): 045-050

    Chebel Fateh, Mennad Moussa & Mezedjri Lyamine
    Structure of the community associated with the gilthead sea bream Sparus aurata Linnaeus, 1758 (Pisces Perciformes Sparidae) of the Algerian east coasts (Jijel, Skikda, Annaba, El-Taraf)

    ABSTRACT
    The structure of the community associated with the gilthead sea bream Sparus aurata Linnaeus, 1758 (Pisces Perciformes Sparidae) of the Algerian east coasts is studied on the basis of data from the oceanographic campaign “ALDEM 2012” carried out in Algeria. The most characteristic species of the S. aurata are determined on the basis of three classification criteria, relative frequency (Fr), density (Dn) and biomass (Dw). These species are 88. Species diversity and evenness are calculated in the coasts of eastern Algeria taking into account the numbers and the weights. Distribution of specific abundance is studied from the models of Motomura, Mac Arthur and Preston. Determination of specific richness, specific diversity, equitability and use of abundance distribution models revealed a young (immature) community with one or more species that tend to dominate in number and weight. A principal component analysis (PCA) was carried out on a matrix of 88 species and 3 variables (Fr, Dn, Dw) in order to separate the species strongly associated with the gilthead sea bream. Mullus barbatus is the species most associated with S. aurata with a significant presence of Trachurus trachurus and Pagellus acarne and, to a lesser degree, Pagellus erythrinus.

  • 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.