Marine Institute Open Access Repository >
Marine Institute Community of Research Publications >
Survey Reports >
Nephrops Under Water TV Surveys >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10793/1184

Title: Aran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 2016 UWTV Survey Report and catch options for 2017
Authors: Doyle, J.
Lordan, C.
Stokes, D.
O'Brien, S.
Kelly, C.
Bentley, K.
Vacherot, J.P.
Keywords: Nephrops norvegicus
stock assessment
geostatistics
underwater television (UWTV)
benthos
CTD
Issue Date: 2016
Publisher: Marine Institute
Citation: Doyle, J., Lordan, C., Stokes, D., O'Brien, S., Kelly, C., Bentley, K. and Vacherot, J.P. (2016). Aran, Galway Bay and Slyne Head Nephrops Grounds (FU17) 2016 UWTV Survey Report and catch options for 2017. Marine Institute UWTV Survey report
Series/Report no.: Marine Institute UWTV Survey report;2016
Abstract: This report provides the main results and findings of the fifteenth 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. In 2016 a total of 45 UWTV stations were successfully completed, 34 on the Aran Grounds, 7 on Galway Bay and 4 on Slyne Head patches. The mean burrow density observed in 2016, adjusted for edge effect, was medium at 0.29 burrows/m². The final krigged burrow abundance estimate for the Aran Grounds was 343 million burrows with a CV (or relative standard error) of 3 %. The final abundance estimate for Galway Bay and Slyne Head was 25 and 11 million burrows with CVs of 7% and 3% respectively. The total abundance estimates have fluctuated considerably over the time series. The 2016 combined abundance estimate was 32% lower than in 2015 and at 379 million and is below the MSY Btrigger (540 million). Using the 2016 abundance estimate and updated stock data implies catch of 489 tonnes and landings of 456 tonnes in 2017 when MSY approach is applied (assuming that discard rates and fishery selection patterns do not change from the average of 2013–2015). Virgilaria mirabilis was the only sea-pen species observed on the UWTV footage. Trawl marks were present at 20% of the Aran stations surveyed.
URI: http://hdl.handle.net/10793/1184
Appears in Collections:Nephrops Under Water TV Surveys

Files in This Item:

File Description SizeFormat
Survey Report Aran UWTV 2016.pdf2.23 MBAdobe PDFView/Open
Use License

Items in the Marine Institute Open Access Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! Marine Institute Copyright © 2011  - Feedback