MSY-orientated management of Baltic Sea herring (Clupea harengus) during different ecosystem regimes

Holmgren, Noél M. A.Högskolan i Skövde,Institutionen för vård och natur,Forskningscentrum för Systembiologi (författare)

The Baltic Sea ecosystem has undergone dramatic changes, so-called ecosystem regime shifts, during the past four decades. Baltic Sea herring (Clupea harengus) spawning-stock biomass has declined to a third, and weight-at-age has halved as a result of food shortages and competition with sprat (Sprattus sprattus). The management objective for the herring stock is currently in transition from precautionary to maximum sustainable yield (MSY). The main basin Baltic Sea herring was modelled under the current ecosystem regime and the effect of a recovery of the cod (Gadus morhua) stock and the availability of planktonic food to levels found in the early 1980s analysed. A target of F-MSY = 0.16 for herring, which should decline to F-MSY = 0.10 with recovery of the cod stock, is proposed. An increase in the availability of planktonic food is estimated to more than double the yield at F-MSY = 0.27, overriding the negative effects of cod predation should there be a simultaneous increase in both cod and availability of planktonic food. The estimated net increase in yield is 40% at F-MSY = 0.20. Functions are presented to calculate FMSY and to estimate the expected yield depending on the abundance of cod and food availability. Retrospective application of the functions is indicative of overfishing of herring in the 1990s and early 2000s, and a net loss in yield, with a landing value of some E440 million.

LANTBRUKSVETENSKAPER Lantbruksvetenskap, skogsbruk och fiske Fisk- och akvakulturforskning hsv//swe
AGRICULTURAL SCIENCES Agriculture, Forestry and Fisheries Fish and Aquacultural Science hsv//eng
density-dependence
fishing mortality
productivity
sustainability
weight-at-age
yield
Naturvetenskap
Natural sciences
Naturvetenskap
Natural sciences

Norrström, NiclasHögskolan i Skövde,Institutionen för vård och natur,Forskningscentrum för Systembiologi(Swepub:his)nori (författare)
Aps, RobertUniversity of Tartu, Estonian Marine Institute, Tallin, Estonia (författare)
Kuikka, SakariFisheries and Environmental Management Group, Department of Environmental Sciences, University of Helsinki, Finland (författare)
Högskolan i SkövdeInstitutionen för vård och natur (creator_code:org_t)

Ingår i:ICES Journal of Marine Science: Oxford University Press69:2, s. 257-2661054-31391095-9289

Av författaren/redakt...: Holmgren, Noél M ...; Norrström, Nicla ...; Aps, Robert; Kuikka, Sakari

Om ämnet

LANTBRUKSVETENSKAPER: LANTBRUKSVETENSK ...; och Lantbruksvetensk ...; och Fisk och akvakul ...

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