FU19 Nephrops Grounds 2024 UWTV Survey Report and catch scenarios for 2025

Abstract

This report provides the main results of the fifteenth underwater television survey of the various Nephrops patches in Functional Unit 19. The survey was multi disciplinary in nature collecting UWTV and other ecosystem data. In 2024 a total 42 UWTV stations were successfully completed. The mean density estimates varied considerably across the different patches. The 2024 raised abundance estimate showed a 32% increase from the 2023 estimate and at 291 million burrows is below the MSY Btrigger reference point (430 million). Using the 2024 estimate of abundance and updated stock data implies catch in 2025 that correspond to the F ranges in the EU multi annual plan for Western Waters are between 385 and 433 tonnes (assuming that discard rates and fishery selection patterns do not change from the average of 2021–2023). One species of sea pen was observed; Virgularia mirabilis which has been observed on previous surveys of FU19. Trawl marks were observed at 13% of the stations surveyed.