OPTIMAL HARVESTING POLICY AND STABILITY FOR SINGLE－SPECIES GROWTH MODEL WITH STAGE STRUCTURE

In this paper,we consider a stage structure population medel with two life stages,immature and mature,with harvesting mature population and stocking immature population.It is shown that under suitable hypotheses there exists a globally asymptotically stable positive equilibrium.The effect of the delay on the populations at equilibrium and the optimal harvesting policy for mature population are also considered.