b) Consider a fish species that is caught with nets. The growth of the fish stock in the absence of fishing is dy - 0.4y (1 - 200) %3D dt 8000- and the harvest rate is, H 0.001y (1) Determine the rate of increase of the fish stock when there is fishing. (ii) Solve for the fishing population, y, as a function of t. (iii) What will happen to the fish population as t → o? Justify your response.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Question 1(b)

b) Consider a fish species that is caught with nets. The growth of the fish stock in the
absence of fishing is
dy
- = 0.4y (1– 8000)
dt
and the harvest rate is, H = 0.001y
(i)
Determine the rate of increase of the fish stock when there is fishing.
(ii)
Solve for the fishing population, y, as a function of t.
(iii)
What will happen to the fish population as t → ∞? Justify your response.
Transcribed Image Text:b) Consider a fish species that is caught with nets. The growth of the fish stock in the absence of fishing is dy - = 0.4y (1– 8000) dt and the harvest rate is, H = 0.001y (i) Determine the rate of increase of the fish stock when there is fishing. (ii) Solve for the fishing population, y, as a function of t. (iii) What will happen to the fish population as t → ∞? Justify your response.
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