Findings of drop down video and stills imagery from an area of drumlins off Northwest Anglesey, July 2019 dataset https://portal.medin.org.uk/portal/start.php?tpc=007_NRW_DS125640 This data contains the raw products of a seabed survey of an area of drumlins off north west Anglesey. The images and video was taken by a Natural Resources Wales owned drop down camera system to provide a better understanding of the seabed structure and biological communities at the survey sites and to investigate the presence of non-native species. The data contains Video (.asf) (and still images (.JPG) The data was collected on the 11th July 2019. The a copy of the MR snapshot produced after data analysis by the contractor is also supplied here. The analysis of the video and stills imagery followed guidelines provided by NRW, Marine EcoSol’s in-house standard operating procedures, and JNCC/NMBAQC recommendations. The video camera showed a swath of seabed approximately 0.3m wide, while still images showed an area estimated as about 0.13m2. All images were reviewed using appropriate high-quality imaging equipment capable of playing and displaying full HD video at 1920p x 1080p resolution. The video and set of stills from each tow were reviewed prior to detailed assessment and recording, and the boundaries between biotopes or biotope complexes noted by recording the time and positional coordinates at which major changes in seabed and habitat type occurred. The species and substratum in each habitat ‘sample’ (tow section) was then recorded, and biotopes assigned. Discrete habitat tow sections or ‘samples’ as defined above were determined using a combination of video and stills images. The lower quality video imagery was then linked to the ‘sample’ in terms of data recording using the time stamp on the video playback. Higher quality stills images were used to identify and quantify substrates and taxa, with abundances pooled to assess the abundance of the taxa over each sample. 20230703