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    FU19 Nephrops Grounds 2013 UWTV Survey and catch options for 2014

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    Author
    Lordan, C.
    Doyle, J.
    Hehir, I.
    O’Sullivan, D.
    Allsop, C.
    O’Connor, S.
    Blaszkowski, M.
    Butler, R.
    Burke, C.
    Stewart, P.
    Keyword
    Nephrops norvegicus
    stock assessment
    geostatistics
    underwater television (UWTV)
    benthos
    CV13015
    Date
    2013
    Publisher
    Marine Institute
    
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    Abstract
    This report provides the main results and findings of the fourth underwater television survey of the various Nephrops grounds in Functional Unit 19. The survey was multi-disciplinary in nature collecting UWTV, CTD, multi-beam and other ecosystem data. In 2013 a total 40 UWTV stations were successfully completed. Adjusted burrow density estimates varied considerably across the different grounds. The 2013 raised abundance estimate of 397 million burrows is a 20% decrease from the 2012 estimate. Taking into account the uncertainty (CV of 17%) this is not significantly different from abundance estimates in 2011 or 2012. Using the 2013 abundance and recent mean weight and discard implies 2014 total catch advice fishing at Fmsy (=F35%spr) of 618 tonnes which results in landings of no more than 521 tonnes.
    URI
    http://hdl.handle.net/10793/911; http://catalog.marine.ie/geonetwork/srv/en/main.home
    Description
    Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.
    Citation
    Lordan, C., Doyle, J., Hehir, I.,O’Sullivan, D., Allsop, C., O’Connor, S., Blaszkowski, M., Butler, R., Burke, C., and Stewart, P. 2013. FU19 Nephrops Grounds 2013 UWTV Survey and catch options for 2014. Marine Institute.
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    Nephrops Under Water TV Surveys

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