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Lyamine Mezedjri

  • Biodiversity Journal, 7 (3): 337-344

    Wafa Tahar, Ouahiba Bordjiba & Lyamine Mezedjri
    Study of the effect of a fungicide "the tachigazole" on some indicators of soil biological activity

    ABSTRACT
    This study tests the impact of a pesticide molecule (hymexazole) on, on the one hand, the physio-biochemistry of hard wheat Triticum durum Desf. (Poales Poaceae) and on the other hand, the indicators of soil biological activity. To do this, the analysis has focused on total proteins, proline, the total carbohydrates and total chlorophyll of wheat leaves. Total carbon and soil organic matter have been also determined. Results reveal that the levels of total chlorophyll are practically identical in the presence of different doses of the fungicide in comparison with those of the control dose. The contents of other parameters (total proteins, carbohydrates and proline) are slightly different from those obtained for witnesses doses. Finally, the analyzed soil samples show that the values of the total carbon are higher and exceed the standards in the samples treated with fungicide.

  • Biodiversity Journal, 7 (2): 229-232

    Souheila Ouamane, Lyamine Mezedjri & Ali Tahar
    Quality of swimming waters in the Gulf of Skikda (Algeria)

    ABSTRACT
    The purpose of this study is to determine the bacteriological and physico-chemical quality of swimming waters in the region of Skikda (Algeria), a popular tourist area known for its many beaches, through the water analysis of ten sites. This monitoring program was carried out for a period of five months.

  • Biodiversity Journal, 4 (2): 269-274

    Lyamine Mezedjri, Ahmed Kerfouf & Ali Tahar
    Reproductive cycle of the European anchovy Engraulis encrasicolus (Linnaeus, 1758) (Clupeiformes Engraulidae) in the gulf of Skikda (Algerian East coasts)

    ABSTRACT
    A study on the sexual cycle of the European anchovy, the pelagic fish Engraulis encrasicolus (Linnaeus, 1758) (Clupeiformes Engraulidae), was carried out in Algerian East coasts over a year (July 2008-June 2009). Annual sex-ratio (SR) showed that females dominate with an average male sex-ratio of 39.35%. The European anchovy spawning period ranges from April to October with peaks in the warmest months, strictly dependent on temperature. The gonado-somatic index was updated monthly which allowed us to divide the entire cycle into four successive phases: (i) a phase of slow maturation which occurs between the end of winter and the beginning of spring; (ii) a phase of significant sexual activity; (iii) a phase of emission of the sexual products which corresponds to the warmest months; and, finally, (iv) a phase of sexual rest occurring in the coldest months. Monthly variation of either hepato-somatic index or mesenteric fat reserves informed us about the origin of the energetic deposits, particularly important for the development of the gonads. In both sexes, the first sexual maturity is reached at a fish total length (Lt) of 12.5 cm.