Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/123321
Authors: 
Ravn-Jonsen, Lars
Andersen, Ken H.
Vestergaard, Niels
Year of Publication: 
2015
Series/Report no.: 
Working Paper, Department of Environmental and Business Economics, University of Southern Denmark 121
Abstract: 
Ecosystem externalities arise when one use of an ecosystem affects its other uses through the production functions of the ecosystem.We use simulations from a size-spectrum ecosystem model to investigate the ecosystem externality created by fishing of multiple species. The model is based upon general ecological principles and is calibrated to the North Sea. Two fleets are considered: a "forage fish" fleet targeting species that mature at small sizes and a "large fish" fleet targeting large piscivorous species. Based on the marginal analysis of the present value of the rent, we develop a benefit indicator that explicitly divides the consequences of fishing into internal and external benefits. This analysis demonstrates that the forage fish fleet has a notable economic impact on the large fish fleet, but the reverse is not true. The impact can be either negative or positive, which entails that for optimal economic exploitation, the forage fishery has to be adjusted according to the large fish fishery. With the present large fish fishery in the North Sea, the two fisheries are well adjusted; however, the present combined exploration level is too high to achieve optimal economic rents.
Subjects: 
Ecosystem Externalities
Forage Fish
Benefit Indicator
Marine Ecosystems
Fisheries management
Size-based
North Sea
Document Type: 
Working Paper
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