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dc.contributor.authorShephard, S.
dc.contributor.authorReid, D. G.
dc.contributor.authorGreenstreet, S. P. R.
dc.identifier.citationShephard, S. Reid, D. G.; Greenstreet, S. P. R. (2011). Interpreting the large fish indicator for the celtic sea. ICES Journal of Marine Science 68 (9), 1963-1972
dc.description.abstractThe large fish indicator (LFI) was developed in the North Sea as a size-based indicator of fish community state. It is now established as OSPAR's fish community Ecological Quality Objective (EcoQO) metric and will be applied across all OSPAR regions. To produce a protocol for use when developing regional LFIs, the North Sea experience is interpreted using data from the Celtic Sea. Differences in fish community species composition and size distribution were reflected in a different species complex and large fish threshold (50 cm) for the Celtic Sea LFI. However, a lag of 12-14 years in the relationship between assemblage-averaged fishing mortality F(com,y) and the LFI suggested similar underlying ecological mechanisms to the North Sea. The indicator responded to changes in small fish biomass that follow fishing-induced changes in the level of predation by large demersal piscivores. The Celtic Sea LFI showed maximum observed values >0.40 before 1990, and 0.40 is here proposed as an EcoQO. Development of regional LFIs demands a flexible process rather than a strictly prescriptive protocol.
dc.publisherOxford University Press (OUP)
dc.relation.ispartofICES Journal of Marine Science
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.subjectecological quality objective
dc.subjectecosystem approach to management
dc.subjectfish community
dc.subjectsize-based indicators
dc.subjectsize-based indicators
dc.subjectwestern north-sea
dc.subjectlong-term changes
dc.subjectfisheries management
dc.subjectcommunity structure
dc.subjectecosystem approach
dc.subjectmarine ecosystems
dc.subjectspatial variation
dc.subjectsurveys provide
dc.titleInterpreting the large fish indicator for the celtic sea

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