Three options for rebuilding the cod stock in the eastern Baltic Sea.

Froese, Rainer and Quaas, Martin (2011) Three options for rebuilding the cod stock in the eastern Baltic Sea. Open Access Marine Ecology Progress Series, 434 . pp. 197-200. DOI 10.3354/meps09247.

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The cod Gadus morhua stock in the eastern Baltic Sea has seen a recent miraculous recovery, mainly due to a drastic decrease in fishing mortality (F). Here we explore 3 options for
rebuilding the stock to the size (biomass that can produce the maximum sustainable yield, or Bmsy) that is required by international law and that can support high long-term yields. The first option implements a fishing mortality of F = 0.3, as is aimed for under the current European Commission management plan. The second option implements in addition the current constraint of a maximum annual increase of 15% in total allowable catches until a catch corresponding to F = 0.3 is reached.
The third option freezes the 2010 catch for 2 yr before allowing a linear increase with spawning stock biomass towards 90% of the maximum sustainable yield. We show that the first option provides the highest catches for the first 3 yr, but fails to rebuild the biomass to the level of Bmsy. The second option rebuilds the biomass above Bmsy only temporarily and results in the lowest catches over a 10 yr period.
The third option rebuilds the biomass above Bmsy and provides high catches and the highest profit
within 10 yr. Within a decade, all 3 options provide several-fold higher biomasses, catches, and profits compared to the current situation, underlining the benefits that can be obtained from proper fisheries management. In comparison, the so-called precautionary management approach (F = 0.6) implemented until 2006 would perform worse in every respect.

Document Type: Article
Keywords: Ichthyology; Cod: Maximum sustainable yield; Eastern Baltic Sea; Stock recovery; Profitable fisheries
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.3354/meps09247
ISSN: 0171-8630
Projects: Future Ocean
Date Deposited: 25 Aug 2011 12:38
Last Modified: 22 Jun 2018 10:00

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