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Fisheries Science

Growth, Mortality and Exploitation Rates of Sarotherodon melanotheron in the Dominli Lagoon of Ghana


Abstract

Sarotherodon melanotheron population of Dominli Lagoon in the Western Region of Ghana was studied for its growth and mortality parameters as well as exploitation rate. The study generally aimed at providing basic information necessary for the assessment and management of the fish stock in the lagoon. Using FiSAT programme, estimates of the prominent growth and mortality parameters of S. melanotheron were: L∞ = 20.48 cm, SL and K = 0.97yr‾¹. Total, natural and fishing mortalities of the population were determined as 3.86 y‾¹, 2.02 y‾¹ and 1.84 y‾¹, respectively. The growth estimates and the maturity-length ratio (≈ 0.7) suggested that the S. melanotheron population was not stunted. The fast growth rate and continuous recruitment exhibited by S. melanotheron were indicative of its suitability for culture. The present exploitation rate (0.48) indicates that the black-chinned population is not overexploited. The Y′/R and B′/R curves as well as all-year-round recruitment show that the current exploitation rate could be maintained for sustainable and rational exploitation of the black-chinned tilapia stock.

 

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Name of Author(s):
"Evans Kwasi Arizi*, Joseph Aggrey-Fynn and Edward Adzesiwor Obodai "
Institutional Affiliation:
Department of Fisheries and Aquatic Sciences, University of Cape Coast, Ghana
Type of Publication:
Journal Article
Name of Publisher or Journal:
Momona Ethiopian Journal of Science
Date of Publication:
2015
Number of Pages:
17