Received Date: 15 May 2021 | Accepted Date: 14 June 2021 | Published Date: 30 June 2021
Keywords: Age structure, Atbara River, condition factor, Khashm El-Girba reservoir, Labeo niloticus, length-weight relationship.
This study was undertaken to assess the length-weight relationship, condition factor and age structure, of the Nile carp, Labeo niloticus, in Khashm El-Girba reservoir and Atbara River, Sudan, from December 2015 to November 2016. Samples of fish were collected bi-monthly from three locations, namely; Um Aswad (Atbara River), El-Remila and El-Monaba (Khashm El-Girba reservoir), using beach seine nets of 1.2, 4.0 and 7.0 cm stretched mesh. Out of a total number of 1,190 specimens of L. niloticus collected from the three sampling sites, 189 specimens were randomly selected to determine age. The relationship between length and weight indicated negative allometric growth pattern in all three locations, where the slope (b) of the (LWR) was highly significant (p<0.001) and ranged from 2.178 to 2.885. The mean condition factor (K) varied monthly in the three locations with values ranging from 1.671 in Um Aswad (Atbara River) to 2.548 in El-Monaba (reservoir). Although the age of L. niloticus ranged from 0+ and 3+ years, yet, most of the studied fish are between age 0 + and 1+.
|Abdalla, M. Y. M. (2018). Biological aspects of Oreochromis niloticus and Labeo niloticus from Khashm El-Girba reservoir and Atbara River, Kassala state, Sudan. M. Sc. Thesis, Department of Zoology, faculty of science, University of Khartoum, Sudan.|
|Abdalla, M. Y. M. Abdelhalim, A. I., & Adam, A. E., (2020). 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. Asian Journal of Research in Zoology, 3(3), 21-28.
|Abu Gideiri, Y. B. (1984). Fishes of the Sudan. Khartoum University press, Democratic Republic of Sudan, 122p.|
|Ahmed, A. A., (1978). On the Biology of Cyprinidae fish in northern part of White Nile. M. Sc. Thesis, Department of Zoology, Faculty of Science, University of Khartoum, Sudan.|
|Ahmed, E. O., Ali, M. E., & Aziz, A. A. (2011). Length-weight relationships and condition factors of six fish species in Atbara River and Khashm el-girba Reservoir, Sudan. International Journal of Agriculture Sciences, 3(1), 65-70.
|Ahmed. E. O. (2002). Studies on the productivity and fisheries of Khashm El-Girba reservoir in relation to annual fishing. M. Sc. Thesis, Department of Zoology, Faculty of Science, University of Khartoum. Sudan.|
|Bagenal, T. B., & Tesch, F.W. (1978). Methods of Assessment of Fish Production of Freshwater. IBP Handbook No. 3, 3rd ed. Black-wells, Science Publication, Oxford, London, Edinburgh.|
|Bailey, R. G. (1994). Guide to the fishes of the River Nile in the Republic of the Sudan. Journal of Natural History, 28(4), 937-970.
|El-Azrag, N. M. (1981). Some biological studies of the family Characidae in the northern part of White Nile. M. Sc. Thesis, Department of Zoology, Faculty of Science, University of Khartoum, Khartoum, Sudan.|
|El-Kasheif, M., Authman, M., & Ibrahim, S. (2007). Study of age, growth and some population dynamics aspects of the Nile Cyprinidae fish, Labeo niloticus, from the River Nile at El-Kanater El-Khyria, Egypt. CATRINA: The International Journal of Environmental Sciences, 2(1), 7-21.|
|El-Moghraby, A. I., Mishrigi, S. Y., & Kheir, H. (1993). Report on the impact of the flushing of Khashm El-Girba reservoir on fisheries resources and its socio-economic on riparian communities. Sudan Environment, Conservation Society. Pp. 14-33.|
|Food and Agriculture Organization (FAO) (2014). The state of world fisheries and aquaculture. Food and Agriculture Organization, Rome, Italy. 223p.|
|Froese, R. (2006). Cube law, condition factor and weight-length relationships: history, meta‐analysis and recommendations. Journal of Applied Ichthyology, 22(4), 241-253.
|Ibrahim, M. A. (2007). Some Aspects of Khashm El-Girba fisheries, Atbara River. M.Sc. Thesis, Department of Zoology, Faculty of Science, University of Khartoum. Sudan.|
|Karar, A. M. M., El-Bassir, H., Adam, I. I., Eisa, M. A., & Adam, M. I. (2017) length- weight relationship and condition factor of three commercial fish species of River Nile, Sudan. EC Oceanography, 1(1), 1 -7.|
|Khallaf, E., Galal, M., & Athuman, M (2003). The biology of Oreochromis niloticus in a polluted canal. Ecotoxicology, 12, 405-416.
|Le Cren, E. D. (1951). The length-weight relationship and seasonal cycle in gonad weight and condition in the perch (Perca fluviatilis). Journal of Animal Ecology, 20(2), 201-219.
|Mensah, S. A. (2015). Weight-length models and relative condition factors of nine freshwater fish species from the Yapei Stretch of the White Volta, Ghana. Elixir Applied Zoology, 79, 30427-30431.|
|Nin, B. M. (1992). Determination of growth in bony fishes from Otolith microstructure. FAO Technical Paper No 322. FAO, Rome, Italy. 51p.|
|Obeida, M. M., (2010). On the biology and fisheries in Jebel Aulia dam reservoir (El hashaba to Elnuzul) using beach seine net. M. Sc. Thesis. Department of fisheries, Collage of Natural Resources and Environment Studies, University of Juba, Sudan.|
|Riedel, R., Caskey, L. M., & Hurlbert, S. H (2007). Length-weight relations and growth rates of dominant fishes of the Salton Sea: implications for predation by fish-eating birds. Lake and Reservoir Management, 23, 528-535.
|Salih, E. H. M., (1995). Fishing, flushing and fish behavior- A case study from the seasonal Khashm El Girba reservoir in Sudan (pp. 197 - 211). In: Santbergen & Van Westen C. J. (eds.). Reservoir in River Basin Development, Balkema, Rotterdam, Netherland.|
|Schneider, J. C., Laarman, P. W., & Gowing, H. (2000). Length-weight relationships, Chapter 17. In: Schneider, J. C. (ed.), Manual of fisheries survey methods II: with periodic updates, Michigan. Department of Natural Resources, Fisheries Special Report 25, Ann Arbor; 2000. Pp. 1-18.|
|Sparre, P., & Venema, S. C. (1992). Introduction to tropical fish stock assessment. Part I Manual. FAO Fisheries. Technical. Paper. 306/1. FAO, Rome, Italy.|
|Yilmaz, S., Yazicioğlu, O., Erbaşaran, M., Esen, S., Nengin, M., & Polat, N. (2012). Length-weight relationship and relative condition factor of white bream, Blicca bjoerkna (L., 1758). Journal of Black Sea/Mediterranean Environment, 18(3), 380-387.|