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:

Title: Porcupine Bank Nephrops Grounds (FU16) 2012 UWTV Survey Report and catch options for 2013
Authors: Lordan, Colm
Doyle, Jennifer
Dobby, Helen
Hehir, Imelda
Fee, Dermot
Allsop, Chris
O'Neill, Ross
Keywords: Nephrops norvegicus
Porcupine Bank
stock assessment
underwater television (UWTV)
Issue Date: 2012
Publisher: Marine Institute
Citation: Lordan, C., Doyle, J., Dobby, H., Heir, I. Fee, D., Allsop, C. & O’Neil, R. 2012. Porcupine Bank Nephrops Grounds (FU16) 2012 UWTV Survey Report and catch options for 2013. Marine Institute UWTV Survey report.
Abstract: This report provides the results of the first 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. The UWTV results and a scientific basis for survey based catch advice in 2013 are presented. In total 47 UWTV stations were successfully completed. The mean burrow density was 0.19 burrows/m² (empirical 95% confidence intervals are from 0.17-0.21). The final krigged abundance estimate was 992 million burrows with a relative standard error of 5% and an estimated stock area of 7,100km2. This abundance estimate can be considered as a conservative estimate given that the spatial coverage of the southern part of the ground was not complete. A correction factor of 1.26 is proposed based on expert judgments of burrow size and potential detection and identification biases. A yield and spawner per recruit analysis was used to estimate a harvest rate of 5.0% for the combined sex F0.1 and other F reference points. This harvest rate is low compared to other FUs and can be considered very conservative. Applying this harvest rate to the abundance observed in the survey and using a mean weight in the landings of 45.0g implies landings in 2013 of 1,770 t. The results here could form the basis of the catch advice for 2013.
Description: Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.
Appears in Collections:Nephrops Under Water TV Surveys

Files in This Item:

File Description SizeFormat
FU16 2012 UWTV Survey Report.pdf1.83 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