Individual vessel quotas and increased fishing pressure on unregulated species

When individual vessel quotas tire used in fisheries management, quotas are set species by, species, in most cases. Often, it is only the most important of the target species that are regulated by quota. There is a growing concern that the introauction of individual vessel quotas leads to increased fishing pressure on unregulated species. To model the behavior of fishermen with this regulatory structure, a constrained profit function is used, Where the quota species are treated as fixed, while the unregulated Species are van. able. An empirical analysis is provided for Norwegian purse seiners.