1) To investigate the structure of fish schools and to assess the effects of changes in these structures on acoustic abundance estimation techniques
2) Underwater TV, still camera, stereo camera, and a small echo-sounder transducer were used
3) Underwater light measurements were made routinely during the cruise using one of the laboratory's standard photomultiplyer systems
Equipment was unloaded on the 21/11/1980
Peter A M Stewart (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Moray Firth, off Nairn
Optics (eg underwater light levels)
Description: Underwater light measurements made routinely during the cruise using one of the laboratory's standard photomultiplier systems.
Biology and fisheries
Acoustic reflection on marine organisms.
Description: Echo-sounder observations to investigate the structure of fish schools.