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dc.contributor.authorDoyle, J.
dc.contributor.authorO'Brien, S.
dc.contributor.authorRyan, G.
dc.contributor.authorGalligan, S.
dc.contributor.authorHernon, P.
dc.contributor.authorAristegui, M.
dc.contributor.authorVacherot, J.P.
dc.contributor.authorLordan, C.
dc.date.accessioned2018-11-08T17:26:54Z
dc.date.available2018-11-08T17:26:54Z
dc.date.issued2018
dc.identifier.citationDoyle, J., O’Brien, S., Ryan, G., Galligan, S., Hernon, P., Aristegui, M., Vacherot, J.P and Lordan, C. 2018. Porcupine Bank Nephrops Grounds (FU16) 2018 UWTV Survey Report and catch scenarios for 2018. Marine Institute UWTV Survey report.en_US
dc.identifier.urihttp://hdl.handle.net/10793/1379
dc.description.abstractThis report provides the results of the sixth underwater television on the ‘Porcupine Bank Nephrops grounds’ ICES assessment area; Functional Unit 16. The survey was multi-disciplinary in nature collecting UWTV, CTD and other ecosystem data. In total 69 UWTV stations were successfully completed in a randomised 6 nautical mile isometric grid covering the full spatial extent of the stock. The mean burrow density observed in 2018, adjusted for edge effect, was 0.16 burrows/m². The final krigged abundance estimate was 1117 million burrows with a relative standard error of 4% and an estimated stock area of 7,130 km2. The 2018 abundance estimate was 31% higher than in 2017. Using the 2018 estimate of abundance and updated stock data implies catch of 2,645 tonnes and landings of 2,645 tonnes in 2019 when MSY approach is applied (assuming that all catch is landed). The three species of sea-pen; Virgularia mirabilis, Funiculina quadrangularis and Pennatula phosphorea, were all observed during the survey. The deepwater sea-pen Kophobelemnon stelliferum was also observed and its presence/absence mapped from the available time-series. Trawl marks were also observed on 33% of the stations surveyed.en_US
dc.language.isoenen_US
dc.publisherMarine Instituteen_US
dc.subjectNephrops norvegicus (L.)en_US
dc.subjectPorcupine Banken_US
dc.subjectstock assessmenten_US
dc.subjectGeostatisticsen_US
dc.subjectUnderwater television (UWTV)en_US
dc.subjectBenthosen_US
dc.subjectSea-pensen_US
dc.titlePorcupine Bank Nephrops Grounds (FU16) 2018 UWTV Survey Report and catch scenarios for 2019en_US
dc.typeTechnical Reporten_US
refterms.dateFOA2018-11-08T17:26:55Z


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