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Please use this identifier to cite or link to this item: http://hdl.handle.net/10793/835

Title: Aran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 2012 UWTV Survey Report and catch options for 2013
Authors: Lordan, Colm
Doyle, Jennifer
Hehir, Imelda
Fee, Dermot
Allsop, Chris
O'Neill, Ross
Keywords: Nephrops norvegicus
stock assessment
geostatistics
nderwater television (UWTV)
benthos
Issue Date: 2012
Publisher: Marine Institute
Citation: Lordan, C., Doyle, J., Hehir, I., Fee, D., Allsop, C., Neill O’, R. 2012. Aran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 2012 UWTV Survey Report and catch options for 2013. Marine Institute UWTV Survey report.
Abstract: This report provides the main results and findings of the eleventh annual underwater television on the Aran, Galway Bay and Slyne head Nephrops grounds, ICES assessment area; Functional Unit 17. The survey was multi-disciplinary in nature collecting UWTV, fishing, CTD and other ecosystem data. The sampling intensity was reduced this year from around 75 stations in the past to 31 on the Aran grounds. A randomised isometric grid design was employed with UWTV stations at 3.5nmi or 6.5km intervals. Previously a 2.25 nmi square grid was used. The kigged burrow abundance estimate declined by 34% relative to 2011 with a CV (or relative standard error) of 5 %. Abundance estimates have fluctuated considerably over the time series but the 2012 abundance is the lowest in the 11 year history of the survey. Four UWTV stations were carried out on the Galway Bay and 3 on the Slyne Head Nephrops grounds. Raised abundance estimates for Galway Bay and Slyne Head are provided based on improved knowledge of the boundaries of those areas. Nephrops accounted for 85% of the benthic catch by weight from 4 beam trawl tows. The observed length frequency and maturity of female Nephops caught was similar to previous years. Various further investigations needed before the next ICES benchmark are discussed.
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/10793/835
http://catalog.marine.ie/geonetwork/srv/en/main.home
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