Cruise summary report
Cruise Info. | |
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Ship name (ship code) | RV Corella (74CX) |
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Cruise identifier | 15/81 |
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Cruise period | 1981-12-01 — 1981-12-15 |
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Status | Completed |
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Port of departure | Lowestoft, United Kingdom |
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Port of return | Lowestoft, United Kingdom |
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Purpose | Research |
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Objectives | 1. To carry out an acoustic survey for sprat within the western Channel between about 2-4ºW, offshore to 50ºN, concentrating on Lyme Bay.
2. To sample and identify any major pelagic shoal concentrations with a mid-water trawl and plot their distributions in finer detail.
3. To run a series of repeat surveys over the main areas of sprat concentration to estimate repeatability errors, particuarly day/night comparisons.
4. To carry out an in situ target strength measurements on sprat using the narrow beam transducer. |
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Chief scientist | P O Johnson (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory) |
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Cruise report | (0.16 MB) |
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Ocean/sea areas | |
General | English Channel |
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Specific | W. Channel (Lyme Bay) |
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Track charts | |
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Measurements | |
Physical oceanography | |
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Surface measurements underway (T,S) | |
CTD stations | Description: Guildluine CTD system run throughout the survey. |
Biology and fisheries | |
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Pelagic fish | Quantity: number of hauls = 14 Description: hauls made with the pelagic Engel Trawl. |
Acoustic reflection on marine organisms. | |
Gear research | Description: SIMRAD QD integrator was tested during this cruise |