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dc.contributor.authorLordan, C.
dc.contributor.authorDoyle, J.
dc.contributor.authorButler, R.
dc.contributor.authorSugrue, S.
dc.contributor.authorAllsop, C.
dc.contributor.authorO’Connor, S.
dc.contributor.authorVacherot, J.P.
dc.date.accessioned2017-10-31T14:54:20Z
dc.date.available2017-10-31T14:54:20Z
dc.date.issued2017
dc.identifier.citationLordan, C., Doyle, J., Butler, R., Sugrue, S., Allsop, C., O’Connor, S, and Vacherot, J-P. (2017). Porcupine Bank Nephrops Grounds (FU16) 2017 UWTV Survey Report and catch options for 2018. Marine Institute UWTV Survey reporten_GB
dc.identifier.urihttp://hdl.handle.net/10793/1334
dc.description.abstractThis report provides the results of the fifth 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 63 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 2017, adjusted for edge effect, was 0.12 burrows/m². The final krigged abundance estimate was 850 million burrows with a relative standard error of 5% and an estimated stock area of 7,134 km2. The 2017 abundance estimate was 11% lower than in 2016. Using the 2017 estimate of abundance and updated stock data implies catch of 2,734 tonnes and landings of 2,734 tonnes in 2017 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 43% of the stations surveyed.en_GB
dc.language.isoenen_GB
dc.publisherMarine Instituteen_GB
dc.relation.ispartofseriesMarine Institute UWTV Survey report;2017
dc.subjectNephrops norvegicusen_GB
dc.subjectPorcupine Banken_GB
dc.subjectstock assessmenten_GB
dc.subjectgeostatisticsen_GB
dc.subjectunderwater television (UWTV)en_GB
dc.subjectsea-pensen_GB
dc.subjectbenthosen_GB
dc.titlePorcupine Bank Nephrops Grounds (FU16) 2017 UWTV Survey Report and catch options for 2018en_GB
dc.typeTechnical Reporten_GB
refterms.dateFOA2018-01-12T06:06:44Z


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