Neco 2022 Agricultural Science Question 23
Practice objective / multiple choice question 23 from the 2022 Neco Agricultural Science examination.
A lake fish species has a natural mortality rate \(M = 0.2\,\text{yr}^{-1}\) and its annual recruitment is given by \(R = 0.5\,B^{0.8}\) where \(B\) is the biomass in tonnes. The current biomass is \(B_0 = 1000\,\text{t}\). A constant annual harvest removes a proportion \(h\) of the biomass each year, so that \(B_{t+1}=B_t(1-h-M)+R_t\). Assuming the biomass remains constant from year to year, find the maximum sustainable harvest proportion \(h\) (as a percentage) that can be applied indefinitely.
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About This Question
This is Neco 2022 Agricultural Science Question 23. It is one of the objective questions from the 2022 Neco Agricultural Science examination.
Difficulty level: Hard .
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