Zooplankton and fish catch statistics comprising species identification and abundance. A proportion of the data relate to unidentified species and estimated abundances (or an indication of abundance magnitude) are often recorded. The data were obtained from the North Atlantic Ocean, predominantly in the region of the Bay of Biscay, between 1973 and 1984. This data set is based upon samples obtained by mid-water trawls from research vessels. It incorporates digital data recorded in field notebooks and reports, together with the results of a retrospective study in 2010 of preserved specimens from the catches. The original data were collected by John Mauchline at the Scottish Marine Biological Association (SMBA) and re-examined in 2010 by scientists at the Scottish Association for Marine Science (SAMS).