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 | ||
| Article 1, Volume 17, Issue 4, December 2013, Pages 1-12 PDF (262.28 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2013.2181 | ||
| Authors | ||
| Adel Hassan1; Midhat El-Kasheif2 | ||
| 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. | ||
| Keywords | ||
| Cichlid; Oreochromis niloticus; Egypt; Fisheries; mortality | ||
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