The “Smalls” Nephrops Grounds (FU22) 2020 UWTV Survey Report and catch scenarios for 2021

This report provides the main results and findings of the fifteenth 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 40 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 8%, was well below the upper limit of 20% recommended by SGNEPS (ICES, 2012). The 2020 abundance estimate was 33% lower than in 2019 and at 750 million is below the MSY Btrigger reference point (990 million). Using the 2020 estimate of abundance and updated stock data implies catch in 2021 that correspond to the F ranges in the EU multi annual plan for Western Waters are between 1238 and 1560 tonnes (assuming that discard rates and fishery selection patterns do not change from the average of 2017–2019). One species of sea pens was recorded as present at the stations surveyed: Virgularia mirabilis. Trawl marks were observed at 48% of the stations surveyed.

URI

http://hdl.handle.net/10793/1658

Citation

Aristegui, M., Blaszkowski, M., Doyle, J., Ryan, G., and McAuliffe, M. (2020). The “Smalls” Nephrops Grounds (FU22) 2020 UWTV Survey Report and catch scenarios for 2021. Marine Institute UWTV Survey report.