Variable effort fishing models in random environments.

摘要: We study the growth of populations in a random environment subjected to variable effort fishing policies. The models used are stochastic differential equations and environmental fluctuations may either affect an intrinsic parameter or be additive noise type. Density-dependent natural policies very general form so that our results will model independent. obtain conditions on for non-extinction non-fixation at carrying capacity similar obtained corresponding deterministic model. also existence stationary distributions (as well as expressions such distributions) equilibrium provide minimal requirements choice wise density-dependent policy.