What is the annual fishing mortality rate, if the fishing effort is 8000 vessels and catchability coefficient is \(5 \times 10^{-4}\) per vessel per year ?
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To easily calculate this in your head, multiply the coefficient base by the effort base: \(5 \times 8 = 40\). Then balance the powers of ten: \(10^{-4} \times 10^{3} = 10^{-1}\). Thus, \(40 \times 10^{-1} = 4.0\).