Real World Applications of Markov Decision Process (MDP)

We need to decide what proportion of salmons to catch in a year in a specific area maximizing the longer term return. Each salmon generates a fixed amount of dollar. But if a large proportion of salmons are caught then the yield of the next year will be lower. We need to find the optimum portion of salmons to catch to maximize the return over a long time period. Here we consider a simplified version of the above problem; whether to fish a certain portion of salmon or not.