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Please use this identifier to cite or link to this item: http://hdl.handle.net/10793/912

Title: Porcupine Bank Nephrops Grounds (FU16) 2013 UWTV Survey Report and catch options for 2014
Authors: Lordan, C.
Doyle, J.
O'Connor, S.
Hehir, I.
Fitzgerald, R.
Blaszkowski, M.
O'Sullivan, D.
O’Donovan, S.
Salaun, M.
Stewart4, P.
Keywords: Nephrops norvegicus
Porcupine Bank
stock assessment
geostatistics
underwater television (UWTV)
benthos
Issue Date: 2013
Publisher: Marine Institute
Citation: Lordan, C., Doyle, J., O'Connor, S., Hehir, I., Fitzgerald, R., Blaszkowski, M., O'Sullivan, D., O’Donovan, S., Salaun, M., Stewart, P. 2013. Porcupine Bank Nephrops Grounds (FU16) 2013 UWTV Survey Report and catch options for 2014. Marine Institute.
Abstract: This report provides the results of the second 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 68 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 2013, adjusted for edge effect, was 0.106 burrows/m². The final krigged abundance estimate was 768 million burrows with a relative standard error of 4% and an estimated stock area of 7,100km2. The abundance estimate was 2% lower than in 2012. Landings options at various different fishing mortalities were calculated in line with the recommendations of WKNEPH 2013. Fishing at Fmsy in 2014 implies a slight increase in the TAC from 1,800 t to 1,850 t. This increase is mainly due to an increase in average mean weight of the landings. The three species of sea-pen found on muddy habitat in Irish waters are Virgularia mirabilis, Funiculina quadrangularis and Pennatula phosphorea were all observed during the survey. Trawl marks were also observed on over half of the stations surveyed.
Description: Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.
URI: http://hdl.handle.net/10793/912
http://catalog.marine.ie/geonetwork/srv/en/main.home
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