This dataset contains survey data collected in 2024 as part of the Balearic Shearwater monitoring project, which delivers data on the UK’s at-sea non-breeding Balearic shearwater population. Funding from the Marine Natural Capital and Ecosystems Assessment (mNCEA) programme allowed a combination of ESAS-trained JNCC surveyors and volunteer surveyors to be deployed on Cefas annual PELTIC survey (PELagic ecosystem in the western English Channel and eastern CelTIC Sea) to collect Balearic shearwater data. These data will increase the evidence base and data time series for this species.