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dc.contributor.authorLordan, Colm
dc.contributor.authorDoyle, Jennifer
dc.contributor.authorDobby, Helen
dc.contributor.authorHehir, Imelda
dc.contributor.authorFee, Dermot
dc.contributor.authorAllsop, Chris
dc.contributor.authorO'Neill, Ross
dc.date.accessioned2012-10-30T14:15:46Z
dc.date.available2012-10-30T14:15:46Z
dc.date.issued2012
dc.identifier.citationLordan, C., Doyle, J., Dobby, H., Heir, I. Fee, D., Allsop, C. & O’Neil, R. 2012. Porcupine Bank Nephrops Grounds (FU16) 2012 UWTV Survey Report and catch options for 2013. Marine Institute UWTV Survey report.en_GB
dc.identifier.urihttp://hdl.handle.net/10793/832
dc.identifier.urihttp://catalog.marine.ie/geonetwork/srv/en/main.home
dc.descriptionUse the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.en_GB
dc.description.abstractThis report provides the results of the first 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. The UWTV results and a scientific basis for survey based catch advice in 2013 are presented. In total 47 UWTV stations were successfully completed. The mean burrow density was 0.19 burrows/m² (empirical 95% confidence intervals are from 0.17-0.21). The final krigged abundance estimate was 992 million burrows with a relative standard error of 5% and an estimated stock area of 7,100km2. This abundance estimate can be considered as a conservative estimate given that the spatial coverage of the southern part of the ground was not complete. A correction factor of 1.26 is proposed based on expert judgments of burrow size and potential detection and identification biases. A yield and spawner per recruit analysis was used to estimate a harvest rate of 5.0% for the combined sex F0.1 and other F reference points. This harvest rate is low compared to other FUs and can be considered very conservative. Applying this harvest rate to the abundance observed in the survey and using a mean weight in the landings of 45.0g implies landings in 2013 of 1,770 t. The results here could form the basis of the catch advice for 2013.en_GB
dc.language.isoenen_GB
dc.publisherMarine Instituteen_GB
dc.subjectNephrops norvegicusen_GB
dc.subjectPorcupine Banken_GB
dc.subjectstock assessmenten_GB
dc.subjectgeostatisticsen_GB
dc.subjectunderwater television (UWTV)en_GB
dc.subjectbenthosen_GB
dc.subjectCV12010en
dc.titlePorcupine Bank Nephrops Grounds (FU16) 2012 UWTV Survey Report and catch options for 2013en_GB
dc.title.alternativeCV12010en
dc.typeTechnical Reporten_GB
refterms.dateFOA2018-01-12T04:03:30Z


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