Data are collected by the survey EVHOE onboard R/V Thalassa, conducted annually in autumn in the Bay of Biscay. Detailed protocol and sampling strategy: ICES. 1991. Report of the study group on the coordination fo bottom trawl surveys in sub-areas VI, VII and VIII and division IXa. ICES C.M. 1991 / G: 13, 33 pp.