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The “Smalls” Nephrops Grounds (FU22) 2024 UWTV Survey Report and catch scenarios for 2025.
Doyle, Jennifer Opanowski, Artur Fahy, James Rapp, Tobias Machado da Silva, Carolina Dower, Ciara Lourenço, Gonçalo Vacherot, J.P.
Doyle, Jennifer
Opanowski, Artur
Fahy, James
Rapp, Tobias
Machado da Silva, Carolina
Dower, Ciara
Lourenço, Gonçalo
Vacherot, J.P.
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Date
2024
Publisher
Marine Institute
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Abstract
This report provides the main results and findings of the nineteenth 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 39 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 2024 abundance
estimate was 9% lower than in 2023 and at 703 million is below the MSY Btrigger reference
point (990 million). Using the 2024 estimate of abundance and updated stock data implies
catch in 2025 that correspond to the ICES MSY approach of 1541 tonnes, assuming that
discard rates and fishery selection patterns do not change from the average of 2021 - 2023.
One species of sea pen was recorded as present at the stations surveyed: Virgularia
mirabilis. Trawl marks were observed at 41% of the stations surveyed.
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Doyle, J., Opanowski, A., Fahy, J., Rapp, T., Silva, C., Dower, C., Lourenço, G., and Vacherot, J-P. (2024). The “Smalls” Nephrops Grounds (FU22) 2024 UWTV Survey Report and catch scenarios for 2025. Marine Institute UWTV Survey report.