Cruise summary report
Cruise Info. | |
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Ship name (ship code) | FRV Mara (74MR) |
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Cruise identifier | 4/66 |
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Cruise period | 1966-04-16 — 1966-05-25 |
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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 study the acoustic properties of fish swim bladders by the analysis of echos and sounds produced by single fish
2) To observe the effects of different rates of decompression on haddock being brought to the surface
3) An attempt was made to determine the optimum rate of ascent to the surface in order to obtain live haddock intact with swim bladders
4) A night dive was carried out in the vicinity of an underwater 200 watt light which had a large aggregation of organisms below it as seen by the ship's echo sounder
5)The routine bottom fauna and hydrographic survey of Loch Linnhe and Loch Eil was carried out
6) Diving observations |
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Chief scientist | Colin J Chapman (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
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Cruise report | (1.95 MB) |
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Ocean/sea areas | |
General | Inner Seas off the West Coast of Scotland |
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Specific | Kyle, approaches to Loch Ainort, Loch Eil, Corpach, Caledonian Canal |
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Measurements | |
Biology and fisheries | |
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Demersal fish | Description: Cruise was to study properties of fish swim bladders. To look at the rates of decompression on haddock being brough to the surface. |
Demersal fish | Description: Fish were held in small cages, suspended in mid water and echoed using low frequency pulsed sound sources.
No. of measurements not recorded. |
Demersal fish | Quantity: activity duration in days = 5 Description: A survey was carried out at Corpach. |
Demersal fish | Description: Cages were laid off 'Moll' in the northern approaches to Loch Ainort.
No. of hauls not specified. |