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Fayçal Chahrour

  • Biodiversity Journal, 3 (3): 165-172

    Saliha Dermeche, Fayçal Chahrour & Zitouni Boutiba
    Evaluation of the toxicity of metal pollutants on embryonic development of the sea urchin Paracentrotus lividus (Lamarck, 1816) (Echinodermata Echinoidea)

    ABSTRACT
    Bioassays are frequently used to evaluate biological effects of pollutants on marine organisms. The objective of such tests is the detection of toxic effects on populations that are representative of a given ecosystem. Sea urchin is a model organism employed in the field of environmental toxicology due to its sensitivity towards various pollutants, particularly heavy metals. Preliminary bioassay tests on embryos and/or larvae of Paracentrotus lividus (Lamark, 1816) from Madagh (Oran, Algeria) were used to assess the potential toxicity and determine the LC50 of four metal pollutants, Cadmium, Copper, Lead and Zinc.

  • Biodiversity Journal, 10 (2): 159-172

    Yamina Tahri, Saliha Dermeche, Fayçal Chahrour & Mohammed Bouderbala
    The reproduction cycle of the sea cucumber Holothuria (Holothuria) tubulosa Gmelin, 1791 (Echinodermata Holo-thuroidea Holothuriidae) in Oran coast, Algeria
    https://doi.org/10.31396/Biodiv.Jour.2019.10.2.159.172

    ABSTRACT
    The aim of this paper is to present an analytical study of gonad index (GI) and repletion index (RI) of Holothuria (Holothuria) tubulosa Gmelin, 1791 (Echinodermata Holothuroidea Holothuriidae). The study is based on biomonitoring data collected from February 2014 to January 2015 in the Oran coast. The gonad index of Holothuria tubulosa is analyzed to show the reproductive cycle and its relationship to environmental parameter conditions. Samples of 15 to 20 individuals were collected monthly at three stations on the Oran coast (La Madrague, Cap Carbon, and Ain Franin). The sex ratio of all sampling was found as (female:male) 0.8:1.2 with no significant difference between sites (X2= 2.18 ; df=4 ; p>0.05) and is also not significant regarding the seasons (spring, summer, autumn, winter) (X2= 3.03 ; df=6 ; p>0.05). Sea cucumber reproduction occurred in September at Cap Carbon and Ain Franin with values of Gonad index (GI) that are 0.33± 0.52 % and 0.22± 0.52 % respectively. At the La Madrague site, the spawning occurred in October with a value of GI of 1.49±2.03 %. It was observed that seawater temperature has a positive correlation with Gonad index (GI) and no correlation with Repletion index (RI).