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El-Bokhty, E., El-Far, A. (2014). Evaluation of Oreochromis niloticus and Tilapia zillii fisheries at Aswan region,River Nile, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 18(3), 79-89. doi: 10.21608/ejabf.2014.2220
El-Azab El-Bokhty; Alaa El-Far. "Evaluation of Oreochromis niloticus and Tilapia zillii fisheries at Aswan region,River Nile, Egypt". Egyptian Journal of Aquatic Biology and Fisheries, 18, 3, 2014, 79-89. doi: 10.21608/ejabf.2014.2220
El-Bokhty, E., El-Far, A. (2014). 'Evaluation of Oreochromis niloticus and Tilapia zillii fisheries at Aswan region,River Nile, Egypt', Egyptian Journal of Aquatic Biology and Fisheries, 18(3), pp. 79-89. doi: 10.21608/ejabf.2014.2220
El-Bokhty, E., El-Far, A. Evaluation of Oreochromis niloticus and Tilapia zillii fisheries at Aswan region,River Nile, Egypt. Egyptian Journal of Aquatic Biology and Fisheries, 2014; 18(3): 79-89. doi: 10.21608/ejabf.2014.2220

Evaluation of Oreochromis niloticus and Tilapia zillii fisheries at Aswan region,River Nile, Egypt

Article 6, Volume 18, Issue 3, September 2014, Page 79-89  XML PDF (4.05 MB)
Document Type: Original Article
DOI: 10.21608/ejabf.2014.2220
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Authors
El-Azab El-Bokhty1; Alaa El-Far2
1National Institute of Oceanography and Fisheries, Egypt
2Fish Biology Laboratory, National Institute of Oceanography and Fisheries, Egypt
Abstract
Cichlid fish species dominating River Nile at Aswan region (namely Oreochromis niloticus and Tilapia zillii) were collected from the widespread used trammel nets. Analysis of the length-frequency using (FiSAT) computer program revealed that, the estimated the Von Bertalanffy's growth parameters were L∞ = 25.73 cm (asymptotic length); k = 0.73 year -1 for O. niloticus and L∞ = 19.43 cm ; k = 1.4 year -1 for Tilapia zillii . The instantaneous total mortality rate of O. niloticus was 3.64 and 5.60 year -1 for T. zillii. The estimated natural mortality rate was 1.44 for O. niloticus and 2.38 year -1
for the second species. The respective fishing mortality rates were 2.2 and 3.22 year -1, while their estimated exploitation rates were 0.60 and 0.57 year-1. The results indicated that, O. niloticus and T. zillii fisheries are overexploited. Therefore, it is recommended to decrease the fishing effort in the area of study and increase the mesh size of the inner layer of trammel nets to at least 3 cm mesh bar to secure profitable fisheries and optimum catch for the future. 
Keywords
O. niloticus; Tilapia zillii; exploitation rate; River Nile; Aswan
Main Subjects
Fisheries
Statistics
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