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Souheïla Azzouz

  • Biodiversity Journal, 9 (3): 181-186

    Souheïla Azzouz, Ali Tahar & Lyamine Mezedjri
    Comparative biometrics of Saurel Trachurus trachurus (Linnaeus, 1758) (Perciformes Carangidae) in the Algerian coast lines
    https://doi.org/10.31396/Biodiv.Jour.2018.9.3.181.186

    ABSTRACT
    During 2012–2013, a comparative biometric study was conducted on a coastal marine teleost fish of the Carangidae family Trachurus trachurus (Linnaeus, 1758). The comparison is made on the basis of seven samples obtained along the Algerian coastline. From East to West: El-kala, Annaba, Skikda, Collo, Jijel, Algiers, and Oran, carrying out 36 morphometric and meristic measurements on each fish. ANOVA Fixed-Variance Analysis of Variance shows the existence of significant differences between the seven sites for 36 variables, as well as the existence of a sexual dimorphism for 22 measured variables and the absence of significant differences for 14 variables out of a total of 36 studied variables. The comparison between the seven sites by MANOVA multivariate statistical tests confirms the results obtained by the ANOVA.

  • Biodiversity Journal, 10 (1): 013-020

    Souheila Azzouz, Lyamine Mezedjri & Ali Tahar
    Reproductive cycle of the pelagic fish Saurel Trachurus trachurus (Linnaeus, 1758) (Perciformes Carangidae) Caught in the Gulf of Skikda (Algerian East Coast)
    https://doi.org/10.31396/Biodiv.Jour.2018.10.1.13.20

    ABSTRACT
    The present study focuses on the reproductive biology of the small pelagic fish Saurel Trachurus trachurus (Linnaeus, 1758) (Perciformes Carangidae), fished in the Gulf of Skikda on the Algerian east coast on an annual cycle from July 2014 to June 2015. The study of average sex ratio variations gave an average annual value of 49.98% in favor of males. The gonado-somatic ratio and the macroscopic examination of the gonads allowed us to locate the period of reproduction between December and April. This report highlights a sexual cycle composed of three successive phases; a slow maturation started from July to November, a phase of significant sexual activity corresponding to the laying period (December-April) and a phase of sexual rest coinciding with the month of May when the gonads recover their masses. On a monthly basis, the evolution of the hepatosomatic ratio values is similar to that observed in the gonado-somatic ones, which leads us to believe that the origin of the energy reserves of the gonads is not the liver and that Saurel is a fat fish, i.e. lipid accumulation occurs in the muscles. The study of mesenteric reserves confirmed the origin of gonadal energetic deposits. The size of the first sexual maturity in males and females is respectively 14 cm and 13.65 cm.