Cruise summary report
Cruise Info. | |
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Ship name (ship code) | FRV Mara (74MR) |
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Cruise identifier | 13C/80 |
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Cruise period | 1980-11-17 — 1980-11-20 |
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Status | Completed |
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Port of departure | Buckie, United Kingdom |
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Port of return | Buckie, United Kingdom |
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Purpose | Research |
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Objectives | 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 |
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Chief scientist | Peter A M Stewart (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
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Cruise report | (0.11 MB) |
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Ocean/sea areas | |
General | North Sea |
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Specific | Moray Firth, off Nairn |
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Measurements | |
Physical oceanography | |
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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 | |
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Acoustic reflection on marine organisms. | Description: Echo-sounder observations to investigate the structure of fish schools. |