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Zbl 1052.92052
Kar, T.K.; Chaudhuri, K.S.
Harvesting in a two-prey one-predator fishery: A bioeconomic model. (English)
[J] ANZIAM J. 45, No. 3, 443-456 (2004). ISSN 1446-1811

Summary: A multispecies harvesting model with interference is proposed. The model is based on Lotka-Volterra dynamics with two competing species which are affected not only by harvesting but also by the presence of a predator, the third species. In order to understand the dynamics of this complicated system, we choose to model the simplest possible predator response function in which the feeding rate of the predator increases linearly with prey density. We derive the conditions for global stability of the system using a Lyapunov function. The possibility of existence of a bioeconomic equilibrium is discussed. The optimal harvest policy is studied and the solution is derived in the equilibrium case using Pontryagin's maximum principle. Finally, some numerical examples are discussed.

MSC 2000:: *92D40 Ecology
34D23 Global stability
49N90 Applications of optimal control and differential games
34D20 Lyapunov stability of ODE
91B76 Environmental economics

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