dc.contributor.author | Shephard, S. | |
dc.contributor.author | Reid, D. G. | |
dc.contributor.author | Gerritsen, H. D. | |
dc.contributor.author | Farnsworth, K. D. | |
dc.date.accessioned | 2018-09-20T16:24:34Z | |
dc.date.available | 2018-09-20T16:24:34Z | |
dc.date.issued | 2014-08-27 | |
dc.identifier.citation | 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 72 (2), 458-466 | |
dc.identifier.issn | 1054-3139,1095-9289 | |
dc.identifier.uri | http://hdl.handle.net/10379/13894 | |
dc.description.abstract | Demersal 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 andHR. 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. | |
dc.publisher | Oxford University Press (OUP) | |
dc.relation.ispartof | ICES Journal of Marine Science | |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 Ireland | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/3.0/ie/ | |
dc.subject | bycatch | |
dc.subject | catchability | |
dc.subject | data-poor stocks | |
dc.subject | elasmobranchs | |
dc.subject | pope's postulate | |
dc.subject | stock assessment | |
dc.subject | life-history | |
dc.subject | celtic sea | |
dc.subject | management | |
dc.subject | fisheries | |
dc.subject | catchability | |
dc.subject | community | |
dc.subject | traits | |
dc.subject | impact | |
dc.subject | skates | |
dc.subject | risk | |
dc.title | Estimating biomass, fishing mortality, and "total allowable discards" for surveyed non-target fish | |
dc.type | Article | |
dc.identifier.doi | 10.1093/icesjms/fsu146 | |
dc.local.publishedsource | https://academic.oup.com/icesjms/article-pdf/72/2/458/8857729/fsu146.pdf | |
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