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Ahlem Amina Taleb Bendiab

  • Biodiversity Journal, 9 (4): 357-368

    Samira Ait Darna, Ahlem Amina Taleb Bendiab, Salim Mouffok, Alae-Eddine Belmahi & Mohamed Bouderbala
    Observation on distribution, biology, growth, diet and feeding strategy of blackmouth catshark Galeus melastomus (Rafinesque, 1810) (Chondrichthyes: Scyliorhinidae) in western Algerian coasts
    https://doi.org/10.31396/Biodiv.Jour.2018.9.4.357.368

    ABSTRACT
    The blackmouth catshark Galeus melastomus (Rafinesque, 1810) (Chondrichthyes Scyliorhinidae) is an accidentally caught species and it acts as a sentinel, by reflecting the state of the region’s fish stocks. Its vulnerability to the impact of fishing, along with the low fertility and late reproduction, do not ensure a good renewal. Data, collected during 13 months from November 2015 to November 2016, were analysed to enrich our knowledge on the population, reproductive biology, growth, and feeding strategy of the blackmouth catshark from the Western coast of Algeria. A total of 551 specimens, 360 males and 191 females, were caught. Their size ranged from 25 cm to 56 cm for both sexes. The length of the first sexual maturity was stunted at 54 cm in females. The asymptotic length was deduced from the von Bertalanffy growth equation to be higher for males than females (females: L∞ = 51.79 cm; males L∞ = 52.14 cm) and the study of the height-weight relationship revealed allometric growth. 551 stomachs were examined and the vacuity index was found to be 63.75%. The preys identified belonged primarily to three major groups: Crustaceans, Osteichthyes, and Cephalopods. Our results show that the feeding strategy of G. melastomus is to be considered generalist and differs from one month to another.

  • Biodiversity Journal, 3 (1): 041-048

    Ahlem Amina Taleb Bendiab, Salim Mouffok & Zitouni Boutiba
    Reproductive biology and growth of Lesser Spotted Dogfish Scyliorhinus canicula (Linnaeus, 1758) in Western Algerian coasts (Chondrichthyes, Scyliorhinidae)

    ABSTRACT
    Elasmobranch fishes have a large distribution. At the level of the Mediterranean fisheries, a low density of elasmobranchs is noted at the assemblages, these fisheries appearing near to the point of best efficiency or even to over-exploitation. Indeed, a general decline of shark populations was observed over the last decade on the Mediterranean coast. The aim of this work was to evaluate different biological characteristics of the species Scyliorhinus canicula (Linnaeus, 1758). A sampling of 461 specimens was realized between September 2009 and August 2010 from the western coast of Algeria. The oviduco-somatic index OSI, the hepatosomatic index (HSI) and the condition factor (Kn) were estimated monthly for 249 females to identify the reproduction period. Obtained results show a rapid maturation from September to November and from February to April when the Kn values are very low.