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    The “Smalls” Nephrops Grounds (FU22) 2021 UWTV Survey Report and catch scenarios for 2022

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    Survey Report FU22 Smalls UWTV ...
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    Author
    Aristegui, M.
    Fitzgerald, Ross
    Lynch, Deirdre
    White, Jonathan
    Doyle, Jennifer
    McAuliffe, M
    Keyword
    Nephrops norvegicus
    stock assessment
    geostatistics
    underwater television (UWTV)
    bentos
    CV21013
    Date
    2021
    Publisher
    Marine Institute
    
    Metadata
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    Abstract
    This report provides the main results and findings of the sixteenth annual underwater television survey on the ‘Smalls grounds’ ICES assessment area; Functional Unit 22. The survey was multi-disciplinary in nature collecting UWTV and other ecosystem data. A total of 42 UWTV stations were surveyed successfully (high quality image data), carried out over an isometric grid at 4.5nmi or 8.3km intervals. The precision, with a CV of 7%, was well below the upper limit of 20% recommended by SGNEPS (ICES, 2012). The 2021 abundance estimate was 13% lower than in 2020 and at 656 million is below the MSY Btrigger reference point (990 million). Using the 2021 estimate of abundance and updated stock data implies catch in 2022 that correspond to the ICES MSY approach of 1257 tonnes assuming that discard rates and fishery selection patterns do not change from the average of 2018–2020. One species of sea pen was recorded as present at the stations surveyed: Virgularia mirabilis. Trawl marks were observed at 24% of the stations surveyed.
    URI
    http://hdl.handle.net/10793/1723
    Citation
    Aristegui, M., Fitzgerald, R., Lynch, D., White. J., Doyle, J., & McAuliffe, M. (2021). The “Smalls” Nephrops Grounds (FU22) 2021 UWTV Survey Report and catch scenarios for 2022. Marine Institute UWTV Survey report. Galway, Ireland
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