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

Abstract: This study has been conducted on Alwero Reservior one of the Reservoir found in Gambella Ethiopia. Data were 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 estimate the current 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 current yield with the corresponding biologically optimum fishing effort level. The estimated current annual yields were 251.07 tons /year of Tilapia. Based on data collected of the fishing pressure on Alwero Reservior. The analysis on data collected of the fishing effort indicated that the recommended safe level of exploitation is at an F factor of 1.8 and the effort can be maintained at its current level of 210 nets/ day.

Pages: 205-210  |  707 Views  130 Downloads

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