Qualitative modeling and simulation of a coupled bioeconomic system

The understanding and management of marine pro-cesses and resources is of great economic and social importance. Marine resources have been greatly ex-ploited, which has led to a thriving but unadopted fish-ery infrastructure and brought about a number of nega-tive environmental impacts. However, the main reason for the non-prosperous rationing of marine resources is the lack of knowledge about certain processes as well as the non-availability of adequate steering instruments. This paper addresses the lack of conceptualization and proposes a qualitative dynamical model approach for an improved decision support under the premise of vague knowledge. This approach makes it necessary to reduce and classify the large solution set supplied by a qual-itative differential equation. The derivation of a focus graph, which displays the behavior of variables of in-terest, allows to extend previous approaches in bioeco-nomic modeling fundamentally and also illustrates the general impacts of an overcapitalization of fleets on a renewable marine resource