Author(s): Alemken Berihun Mengist and Selemon Thomas Fakana

Abstract: Global water bodies are suffering from excessive overfishing, exerted by an increasing demand of the population. In order to follow up the status of fishery, stock assessment and estimation of optimum yield is needed for the provision of necessary information for the decision makers to make rational decision on the optimum level of exploitation of fish resources. This study has been conducted on Alwero Reservior one of the Reservoirs found in Gambella Ethiopia. Data was collected on a daily basis for 60 days (from 1-10-2019 to 1-12-2019) from the area where fish were landed. The length composition of tilapia caught by the fishery, total tilapia yield and fishing effort expanded were the basic information collected from the site The aim of the analysis was to estimate the population number of tilapia and fishing mortality coefficient by length group as well as predict the maximum sustainable fish yield and biologically optimum level of fishing pressure for the tilapia stock of the reservoir. Jones length based cohort analysis Model and length-based Thompson and Bell yield Prediction Model have been employed to estimate the maximum sustainable yield with the corresponding biologically optimum fishing effort level. Based on data collected of the fishing pressure on Alwero Reservior, the estimated population number of tilapia were 37.9 million and the predicted values of MSY were 311.63tons/yr and this is obtained at fishing mortality factor of 2.

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