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Western Irish Sea Nephrops Grounds (FU15) 2012 UWTV Survey Report
Doyle, J.; Lordan, C.; Fitzgerald, R.; Strong, J.; Service, M.
This report provides the main results and findings of the tenth annual underwater television on the ‘Irish sea west Nephrops grounds’ ICES assessment area; Functional Unit 15. The survey was multi-disciplinary in nature collecting UWTV, CTD and other ecosystem data. An analysis of the precision, accuracy and sampling intensity trade-offs showed that sampling intensity could be reduced without significantly reducing the precision and accuracy of the survey. Consequently, sampling intensity was reduced this year from ~150 stations in a 3.5 nautical mile grid to 99 stations (4.5nmi grid). Full coverage of the grid was achieved. The krigged burrow abundance estimate for the Irish Sea ground increased slightly (+3% relative to 2011). Abundance estimates have been fairly very stable over the time series. The 2012 randomised isometric grid design resulted in a CV (or relative standard error) of 3% which is in line with CVs observed previously and well below the upper limit of 20% recommended by SGNEPS 2012.
Keyword(s): Stock assessment; Underwater television (UWTV); Benthos; geostatistics; Nephrops norvegicus
Publication Date:
2013
Type: Working paper
Peer-Reviewed: Unknown
Language(s): English
Institution: Marine Institute
Citation(s): Doyle, J., Lordan, C., Fitzgerald, R., Strong, J. and Service, M. 2013. Western Irish Sea Nephrops Grounds (FU15) 2012 UWTV Survey Report. Marine Institute and Agri-Food and Biosciences Institute.
Publisher(s): Marine Institute & Agri-Food and Biosciences Institute
First Indexed: 2013-11-19 11:02:44 Last Updated: 2018-02-15 07:01:59