Growth, Mortality, and Longevity of Tilapia guineensis (Bleeker, 1852) in Tropical Man-Made Lake, Southwestern Nigeria

Document Type : Original Article

Author

Hydrobiology and Fisheries Unit, Department of Zoology, University of Ibadan, Oyo State, Nigeria

Abstract

Background: Fisheries resources are being depleted due to over-exploitation and inadequate information for planning and management; therefore, data on growth pattern, mortality, and exploitation rates of fisheries resources are essential for effective management and sustainable exploitation.
Method: Growth parameters, mortality rates, and longevity of the Guinean tilapia, Tilapia guineensis, (Bleeker, 1852) in Asejire Lake were obtained from length composition data from January, 2013 to December, 2013.
Results: The von Bertalanfy growth function estimates were: L∞ = 30.98 cm Total length, K = 0.37 year-1 and t0 = -0.441. Total mortality rate (Z)was 1.19 year-1, natural mortality rate (M) was calculated as 0.92 year-1 , fishing mortality rate (F) obtained was 0.27 year-1, and the exploitation rate (E) was 0.23. Growth performance index (ø) computed as 2.55.
Conclusion: This result indicates low growth rate. The stock was not overexploited since exploitation rate was less than the optimal exploitation rate(0.5).

Keywords

Egyptian Academic Journal of Biological Sciences, B. Zoology
Volume 7, Issue 2
December 2015
Pages 33-38

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