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dc.contributor.authorShephard, S.
dc.contributor.authorReid, D.G.
dc.contributor.authorGerritsen, H.D.
dc.contributor.authorFarnsworth, K.D.
dc.date.accessioned2016-09-13T09:38:41Z
dc.date.available2016-09-13T09:38:41Z
dc.date.issued2014
dc.identifier.citationShephard, S., Reid, D. G., Gerritsen, H. D., & Farnsworth, K. D. (2014). Estimating biomass, fishing mortality, and “total allowable discards” for surveyed non-target fish. ICES Journal of Marine Science: Journal du Conseil, fsu146.en_GB
dc.identifier.otherdoi:10.1093/icesjms/fsu146
dc.identifier.urihttp://hdl.handle.net/10793/1159
dc.descriptionThis is a pre-copy-editing, author-produced PDF of an article accepted for publication in ICES Journal of Marine Science following peer review. The definitive publisher-authenticated version “Shephard, S., Reid, D. G., Gerritsen, H. D., & Farnsworth, K. D. (2014). Estimating biomass, fishing mortality, and “total allowable discards” for surveyed non-target fish. ICES Journal of Marine Science: Journal du Conseil, fsu146.” is available online at: doi:10.1093/icesjms/fsu146 peer-revieweden_GB
dc.description.abstractDemersal fisheries targeting a few high-value species often catch and discard other “non-target” species. It is difficult to quantify the impact of this incidental mortality when population biomass of a non-target species is unknown. We calculate biomass for 14 demersal fish species in ICES Area VIIg (Celtic Sea) by applying species- and length-based catchability corrections to catch records from the Irish Groundfish Survey (IGFS). We then combine these biomass estimates with records of commercial discards (and landings for marketable non-target species) to calculate annual harvesting rates (HR) for each study species. Uncertainty is incorporated into estimates of both biomass and HR. Our survey-based HR estimates for cod and whiting compared well with HR-converted fishing mortality (F) estimates from analytical assessments for these two stocks. Of the non-target species tested, red gurnard (Chelidonichthys cuculus) recorded some annual HRs greater than those for cod or whiting; challenging “Pope's postulate” that F on non-target stocks in an assemblage will not exceed that on target stocks. We relate HR for each species to two corresponding maximum sustainable yield (MSY) reference levels; six non-target species (including three ray species) show annual HRs ≥ HRMSY. This result suggests that it may not be possible to conserve vulnerable non-target species when F is coupled to that of target species. Based on biomass, HR, and HRMSY, we estimate “total allowable catch” for each non-target species.en_GB
dc.description.sponsorshipFunder: Marine Instituteen_GB
dc.language.isoenen_GB
dc.publisherOxford University Pressen_GB
dc.relation.ispartofseries72;2
dc.subjectbycatchen_GB
dc.subjectcatchabilityen_GB
dc.subjectdata-poor stocksen_GB
dc.subjectelasmobranchsen_GB
dc.subjectPope's postulateen_GB
dc.subjectstock assessmenten_GB
dc.titleEstimating biomass, fishing mortality, and “total allowable discards” for surveyed non-target fishen_GB
dc.typeArticleen_GB
refterms.dateFOA2018-01-12T05:54:47Z


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