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Please use this identifier to cite or link to this item: http://hdl.handle.net/10793/988

Title: Porcupine Bank Nephrops Grounds (FU16) 2014 UWTV Survey Report and catch options for 2015
Authors: Doyle, J.
Lordan, C.
O'Cuaig, M.
Hannify, O.
Murphy, Á.
Sheridan, M.
Vila, Y.
Keywords: Nephrops norvegicus
Porcupine Bank
stock assessment
geostatistics
underwater television (UWTV)
benthos
Issue Date: Oct-2014
Publisher: Marine Institute
Citation: Doyle, J., Lordan, C., O’Cuaig, M., Hannify, O., Murphy, A., Sheridan, M., and Vila, Y. 2014. Porcupine Bank Nephrops Grounds (FU16) 2014 UWTV Survey Report and catch options for 2015. Marine Institute UWTV Survey report.
Series/Report no.: Version 2;
Abstract: This report provides the results of the third 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 67 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 2014, adjusted for edge effect, was 0.10 burrows/m². The final krigged abundance estimate was 722 million burrows with a relative standard error of 3% and an estimated stock area of 7,108km2. The abundance estimate was 6% lower than in 2013. Landings options at various different fishing mortalities were calculated in line with the recommendations of WKNEPH 2013. Fishing at Fmsy in 2015 implies catches of 1,850 t which close to the 2014 catch limit. This is because of an increase in average mean weight of the landings. The three species of sea-pen; 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.
URI: http://hdl.handle.net/10793/988
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