Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 79, Issue 1, Pages 169-181Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsab251
Keywords
Baltic cod; bio-economic model; profits; herring; sprat; MSY; MEY
Categories
Funding
- European Union [773713, 101000318]
- German Federal Ministry of Education and Research [01LC1826A]
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The Baltic fisheries are facing challenges due to reduced cod stock productivity and altered species interactions. By using a multispecies model, it was found that the economic importance of cod decreased while clupeids increased under prevailing conditions. The study suggests that an economic multispecies management objective might be more useful and identifies new trade-offs and synergies by including a consumer perspective.
The Baltic fisheries are in distress. In the Central Baltic, fisheries management is challenged by reduced cod stock productivity, and altered species interactions. Here, we use an age-structured, ecological-economic multispecies model, which includes latest biological and economic knowledge, to advance our understanding of optimal fisheries management and related trade-offs between user groups under such altered conditions. We contribute to the scientific discussion (i) by showing that the economic importance and optimal stock size of cod largely decreased under prevailing conditions, while clupeids increased in importance. (ii) We challenge the current MSY management objective in a multispecies setting (MMSY) and suggest that an economic multispecies management objective (MMEY) might be more useful for setting future management targets. (iii) We identify new trade-offs and synergies by including a consumer perspective: There is a win-win situation for ecological conservation, and profits in the fishery, while fishery management faces trade-offs between these two on the one hand, and consumer surplus on the other hand. (iv) Finally, we suggest an easy to implement new management approach, called robust management, which is capable of better dealing with variability and time-trends in recruitment, as observed for cod, in order to safeguard the Central Baltic fishery resources.
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