Skip to main content

Alae-Eddine Belmahi

  • Biodiversity Journal, 9 (4): 369-373

    Amaria Latefa Bouziani, Alae-Eddine Belmahi, Youcef Belmahi, Sihem Abid-Kachour & Mohamed Bouderbala
    Reproductive Biology of Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817) (Pisces Sparidae) in the west coast of Algeria
    https://doi.org/10.31396/Biodiv.Jour.2018.9.4.369.373

    ABSTRACT
    The study of the reproduction of Diplodus vulgaris (Geoffroy Saint-Hilaire, 1817) (Pisces Sparidae) of the Algerian West coast - carried out from September 2015 to August 2016 - related to 472 specimens, whose overall length ranged between 14.6 cm and 28.4 cm. The ratio of gonad weight to total weight was assessed monthly, and the evolution of the stages of sexual maturity revealed that, for D. vulgaris, the period of reproduction is between October and February with an oviposition in January. The sex ratio related to the size showed that males are dominant in the classes of small sizes (14–18 cm) and females dominate in the classes of great sizes (19–29 cm).

  • 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, 10 (3): 185-194

    Mouloud Benabdi, Lalla A. T. Cherif-Louazani, Alae Eddine Belmahi, Samir Grimes, Yassine G.E. Khames, Billel Boufekane, Salim Mouffok & Mohamed Bouderbala
    Morphometric data and allometric relationships of the gorgonian Eunicella singularis (Esper, 1791) (Anthozoa Gorgoniidae) of Paloma Island, Algeria
    https://doi.org/10.31396/Biodiv.Jour.2019.10.3.185.194

    ABSTRACT
    The gorgonian Eunicella singularis (Esper, 1791) (Anthozoa Gorgoniidae) is abundant on rocky bottoms at Paloma Island (Algeria) in the south-western of the Mediterranean basin. In this study area, 150 gorgonian colonies of E. singularis were collected randomly using SCUBA diving and the following morphometric macro-features were measured (maximum height, maximum width, total branch length, rectangular surface area, height to width ratio and dry weight). Allometric growth was examined using the relationships between the dry weight and the five morphometric macro-features. The power equation of the simple allometry applied was y=axb and the parameters of the linear regression a and b were estimated after the logarithmic transformation log (y)=log( a)+ b*log(x). The allometric relationships between the dry weight and the morphometric macro-features studied show that the growth of the gorgonian E. singularis in the study area is correlated positively and significantly with the five macro-features and that both the macro-features total branch length and the maximum width are the most appropriate parameter applied to the gorgonian E. singularis growth study.