Cruise Info. | |
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Ship name (ship code) | FRV Explorer (74EX) |
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Cruise identifier | 9/72 |
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Cruise period | 1972-10-14 — 1972-10-31 |
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Status | Completed |
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Port of return | Leith, United Kingdom |
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Purpose | Research |
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Objectives | 1) Northern North Sea pre-recruit survey
2) Comparative trawling exercise with the Russian vessel ''Langust'' to carry out 12 comparative trawls at stations south and south east of Shetland
The development of a defect in the ship's rudder and palastre pin meant the cruise terminated earlier than planned. Rough weather also curtailed the sampling programme |
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Chief scientist | Richard B Burns (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory) |
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Cruise report | (0.20 MB) |
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Ocean/sea areas | |
General | North Sea Norwegian Sea |
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Specific | Shetland area, E of Aberdeenshire, E of Fair Isle, Fladen Ground, E of Balta, western edge of the Norwegian Deeps |
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Measurements | |
Physical oceanography | |
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Water bottle stations | Quantity: number of stations = 32 Description: subsurface temperature, surface salinity |
Subsurface temperature and salinity measurements | Quantity: number of stations = 32 Description: subsurface temperature, surface salinity |
Chemical oceanography | |
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Phosphate | Quantity: number of stations = 32 |
Nitrate | Quantity: number of stations = 32 |
Ammonia | Quantity: number of stations = 32 |
Silicate | Quantity: number of stations = 32 |
Biology and fisheries | |
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Primary productivity | Quantity: number of stations = 32 |
Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of stations = 32 Description: chlorophyll |
Phytoplankton | Quantity: number of hauls = 9 Description: Oblique. Made with the Dutch Gulf III at all stations and catches were deep frozen for dry weight determination |
Zooplankton | Quantity: number of stations = 32 |
Pelagic fish | Quantity: number of hauls = 35 Description: 1 hour duration using the 48 ft Aberdeen trawl with small mesh cover. A cod-end mesh size of 3 and a half inches was used for the first 26 trawls and changed to one of 3 inches for the remainder. Haddock was the dominant species followed by whiting, cod, saithe, industrial species, monkfish and flatfish. Herring and sprat were also caught |
Demersal fish | Quantity: number of hauls = 35 Description: 1 hour duration using the 48 ft Aberdeen trawl with small mesh cover. A cod-end mesh size of 3 and a half inches was used for the first 26 trawls and changed to one of 3 inches for the remainder. Haddock was the dominant species followed by whiting, cod, saithe, industrial species, monkfish and flatfish. Herring and sprat were also caught |
Taggings | Description: 28 plaice, 8 lemon sole. |