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Title: The “Smalls” Nephrops Grounds (FU22) 2014 UWTV Survey Report and catch options for 2015
Authors: Lordan, C.
Doyle, J.
Fitzgerald, R.
O'Connor, S.
Blaszkowski, M.
Simpson, S.
Keywords: Nephrops norvegicus
stock assessment
underwater television (UWTV)
Issue Date: Oct-2014
Publisher: Marine Institute
Citation: Lordan, C., Doyle, J., Fitzgerald, R., O’Connor, S., Blaszkowski, M., and Simpson, S. 2014. The “Smalls” Nephrops Grounds (FU22) 2014 UWTV Survey Report and catch options for 2015. Marine Institute UWTV Survey report.
Series/Report no.: Version 2;
Abstract: This report provides the main results and findings of the ninth annual underwater television survey on the ‘Smalls grounds’ ICES assessment area; Functional Unit 22. The survey was multi-disciplinary in nature collecting UWTV, CTD and other ecosystem data. A total of 52 stations UWTV stations were carried out over an isometric grid at 4.5nmi or 8.3km intervals. The krigged burrow abundance estimate for the Smalls ground increased by 22% relative to 2013 and was the highest in the 9 year time series. The final abundance estimate was 1,622 million with a CV of 8% which is well below the upper limit of 20% recommended by SGNEPS 2012. Using the 2014 estimate of abundance and recent mean weight and discard data would imply total catches at Fmsy in 2015 of 3,797t. This implies landings of 3,409 tonnes. Temperature on the seabed varied by 2oC over the Nephrops ground with coldest values around 9.4oC in the deepest part of the area. Only one species of sea pen Virgilaria mirabilis was recorded as present at 46% of the stations surveyed. Trawl marks were observed at 28% of the stations surveyed.
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