Biomass and abundance of deep-pelagic fish from epi to bathypelagic trawls hauls in the Bay of Biscay, North-East Atlantic Ocean between 2021 and 2022

The dataset represents the biomass, abundance, and individual total length of 57 deep pelagic fish species collected by night pelagic trawling on the Bay of Biscay slope during the EVHOE scientific cruises in autumn 2021 and 2022 (https://doi.org/10.18142/8). Ten trawls were conducted at night between 25 m and 1400 m depth. The trawl had an average vertical mouth opening of 24m and a horizontal opening of 58m. The trawl did not have an opening-closing mechanism; therefore, some individuals might have been caught during the descent and ascent of the gear. The mesh size gradually decreased from 76mm to 44mm in the bag. The duration of the haul was approximately 1 hour at 4 knots.