i want the detail

Question 5. (25 points) Consider a dynamic model with age-structured fisheries. In this model there are two types of fish; adults and juveniles (for example, salmon and caviar). Let Jt represent the biomass of juveniles at time t. Let At represent the biomass of adults at time t. The biomass of juveniles in period t + 1 depends on the escapement of adults in period t according to the net growth function F(St), where escapement is St = At - YA, and YA represents the catch of adults at time t. The biomass of adults in period t + 1 depends on juvenile natural mortality m and the harvest of juveniles Y,B. In summary, the dynamics of the two species are determined by: At + 1 = At + FLA) -Yt J+ +1 = F(S. ) Se = At - Yet Att1 = Jt - mat - Y with 0