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The aim of this study is to investigate some biological aspects of the Nile carp, Labeo niloticus, in Khashm El-Girba reservoir and Atbara River, Sudan. The study was conducted during December 2015 to November 2016. Samples were collected bi-monthly from three localities, namely; Um Aswad (Atbara River), El-Remila and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2 cm 4.0 cm and 7.0 cm stretched mesh. A total number of 1,190 specimens of L. niloticus were collected from the three sampling sites. Two peaks of abundance were observed for Original Research Article Abdalla et al.; AJRIZ, 3(3): 21-28, 2020; Article no.AJRIZ.60308 22 L. niloticus at all sampling sites (FebruaryMarch and SeptemberOctober). Sex ratio was 1:1, except in downstream areas, where females were more dominant than males. Gonado-somatic index showed one peak of increase, and ranged from 1.28 1.79 and 0.50 – 1.701 for females and males respectively, indicating one spawning season.

asian journal of research in zoology

Study of Some Biological Aspects of the Nile Carp, Labeo niloticus (Pisces, Cyprinidae) from Khashm El-Girba Reservoir and Atbara River, Sudan: I Abundance; Sex Ratio; Gonado-somatic Index and Breeding Season