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dc.contributor.authorDoyle, J.
dc.contributor.authorGalligan, S.
dc.contributor.authorAristegui, M.
dc.contributor.authorO’ Brien, S.
dc.contributor.authorFitzgerald, R.
dc.contributor.authorTully, D.
dc.contributor.authorMcAuliffe, M
dc.date.accessioned2020-11-19T17:03:45Z
dc.date.available2020-11-19T17:03:45Z
dc.date.issued2020
dc.identifier.citationDoyle, J., Galligan, S., Aristegui, M., O’Brien, S., Fitzgerald, R., Tully, D., and McAuliffe, M. (2020). Aran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 2020 UWTV Survey Report and catch scenarios for 2021. Marine Institute UWTV Survey report.en_US
dc.identifier.urihttp://hdl.handle.net/10793/1656
dc.description.abstractThis report provides the main results and findings of the nineteenth annual underwater television survey on the Aran, Galway Bay and Slyne head Nephrops grounds, ICES assessment area; Functional Unit 17. The survey was multi-disciplinary in nature collecting UWTV, CTD and other ecosystem data. In 2020 a total of 44 UWTV stations were successfully completed, 34 on the Aran Grounds, 5 on Galway Bay and 5 on Slyne Head patches. The mean burrow density observed in 2020, adjusted for edge effect, was medium at 0.29 burrows/m². The final krigged burrow abundance estimate for the Aran Grounds was 359 million burrows with a CV (Coefficient of Variance; relative standard error) of 4%. The final abundance estimate for Galway Bay was 27 million and for Slyne Head was 7 million, with CVs of 13% and 4% respectively. The total abundance estimates have fluctuated considerably over the time series. The 2020 combined abundance estimate (394 million burrows) is 20% lower than in 2019, and it is below the MSY Btrigger reference point (540 million burrows). Using the 2020 estimate of abundance and updated stock data implies catches between 443 and 508 tonnes in 2021 that correspond to the F ranges in the EU multi annual plan for Western Waters, assuming that discard rates and fishery selection patterns do not change from the average of 2017–2019. Virgularia mirabilis was the only sea-pen species observed on the UWTV footage. Trawl marks were present at 7% of the Aran stations surveyed.en_US
dc.language.isoenen_US
dc.publisherMarine Instituteen_US
dc.relation.ispartofseriesMarine Institute UWTV Survey report;
dc.subjectNephrops norvegicusen_US
dc.subjectstock assessmenten_US
dc.subjectgeostatisticsen_US
dc.subjectunderwater television (UWTV)en_US
dc.subjectbenthosen_US
dc.subjectCTDen_US
dc.titleAran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 20 20 UWTV Survey Report and catch scenarios for 2021en_US
dc.typeTechnical Reporten_US
refterms.dateFOA2020-11-19T17:03:46Z


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