The economic situation of fishing companies depend heavily on the regulatory framework determined by fisheries management. An increase or decrease of fishing opportunities will have implications on actual and future catch possibilities as well as the biomass of the respective stocks. Also in case of other measures like closed seasons or areas there will be economic impacts on the fleet. With the application of bio-economic models we assess the effects of proposed management measures which limit or increase fishing activities. The aim is to be able to predict with some security under which circumstances fishers may stay profitable and how measures impact the economic situation of the fishing sector in the future.