Hassan, A., El-Kasheif, M. (2013). Age, growth and mortality of the cichlid fish Oreochromis niloticus (L.) from the River Nile at Beni Suef Governorate, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 17(4), 1-12. doi: 10.21608/ejabf.2013.2181
Adel Hassan; Midhat El-Kasheif. "Age, growth and mortality of the cichlid fish Oreochromis niloticus (L.) from the River Nile at Beni Suef Governorate, Egypt". Egyptian Journal of Aquatic Biology and Fisheries, 17, 4, 2013, 1-12. doi: 10.21608/ejabf.2013.2181
Hassan, A., El-Kasheif, M. (2013). 'Age, growth and mortality of the cichlid fish Oreochromis niloticus (L.) from the River Nile at Beni Suef Governorate, Egypt', Egyptian Journal of Aquatic Biology and Fisheries, 17(4), pp. 1-12. doi: 10.21608/ejabf.2013.2181
Hassan, A., El-Kasheif, M. Age, growth and mortality of the cichlid fish Oreochromis niloticus (L.) from the River Nile at Beni Suef Governorate, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 2013; 17(4): 1-12. doi: 10.21608/ejabf.2013.2181
Age, growth and mortality of the cichlid fish Oreochromis niloticus (L.) from the River Nile at Beni Suef Governorate, Egypt
1Zoology Department, Faculty of Science, Ain Shams University,Cairo, Egypt
2National Institute of Oceanography and Fisheries, Cairo, Egypt
Abstract
Monthly samples of Oreochromis niloticus from the River Nile at Beni Suef were collected during the period from January 2009 to December 2010. The Von Bertalanffy growth function parameters were: 𝐋∞ = 48.14 cm, K = 0.147 𝐲𝐫−𝟏, and 𝐭𝟎 = 0.2237 year. The total mortality coefficient (Z) was calculated as 0.9654 𝐲𝐫−𝟏, the natural computed mortality coefficient (M) was 0.4010 𝒚𝒓−𝟏 with fishing mortality (F) estimated as 0.5643 𝐲𝐫−𝟏 and exploitation ratio (E) calculated as 0.5819. This high exploitation ratio shows that the stock of Oreochromis niloticus from the River Nile at Beni Suef is overexploited.
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