The possibility of qualitative modeling of renewable fish resources

The problem in management of the renewable resources commonly arises from the competition between resources users, what at the end causes overexploitation of the resources (tragedy of the commons). Daily it is possible to encounter some examples of inappropriate, i.e. overexploitation of natural renewable resources (such are fishes, whales, forests, terrestrial plant and animal population, even and humans). Renewable resources, in this paper fish population, typically include fish stock and natural nonlinearities which is product of complex of behaviour dynamics of the fish population system. The main purpose of this paper is to present possibility of System Dynamics in education, research and designing in management of the fishing in some restricted area. The aim of this paper is to present the practical application of the method of the System Dynamics for qualitative and quantitative modelling of behaviour dynamics of renewable resources, i.e. fish population. Also, all cause – consequence relations between relevant variables of fish population system will be pointed out, including the dominant feedback loops. Fish population system shall be presented with mental-verbal and structural models in changeable condition of the exploitation (i.e. their ecological environments). Furthermore, the adequate model for management of fish population with optimal profits and satisfaction with all possible limitation of the environments will be given. In given model of management the main concern is not to over fish, and cause of that we will determinate optimal fishing capacities.