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
The vessel anchored overnight in the outer Dornoch Firth
Anthony D Hawkins (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cromarty Firth, Inverness Firth, off Golspie
Optics (eg underwater light levels)
Description: Underwater light measurements made routinely during the cruise using one of the laboratory's standard photomultiplier systems.