RV Corella 5/67
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RV Corella (74CX) |
| Cruise identifier | 5/67 |
| Cruise period | 1967-09-07 — 1967-09-14 |
| Status | Completed |
| Port of departure | Lowestoft, United Kingdom |
| Port of return | Lowestoft, United Kingdom |
| Purpose | Trials |
| Objectives | 1. To carry out tests of the Acoustic Arch System with ground and mid-water trawls in the Whitby or Silver Pit areas.
2. To carry out tests of Birmingham University equipment for telemetry. 3. Trawl winches: To test Lebus spooling gear and brakes under trawling conditions. - The gear was shot with an Acoustic Link fitted to the headline. The receiving transducer was tried in various positions around the ship but no signals were received. - Further hauls were made with the Arch System when different positions of the unit were tried with little improvement in the variability of signal. - A search was made for midwater traces and a practise haul was made with the 4 panel mindwater trawl in Bridlington Bay - Tests were carried out on the underwater television and divers lights at a depth of 50 m and also in the surface. - An echo survey grid was arranged - Tests were carried out on the cable winch and trawl winch - A sample of sprats were preserved for Dr. Johnson - Noise measurements were made with the hydrophone streamed alongside the ship |
| Chief scientist | Ronald B Mitson (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory) |
| Cruise report |  (0.21 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Specific | Whitby area, Silver Pit area, Smith's Knoll, Bridlington Bay, and Skate Hole |
| Measurements | |
| Biology and fisheries | |
| Pelagic fish | Quantity: number of measurements = 34 Description: 2 baskets of mixed fish and a basket of Nephrops were caught in the Outher Silver Pit. 16 baskets of herring and 2 baskets of sprats were caught in Skate Hole. 6 baskets of sprats, 1 of herring, 1 of mackerel were caught. 5 baskets of sprats remained in the codend |
| Pelagic fish | Quantity: sample baskets = 2 Description: Herring caught in the Outer Silver Pit |
| Crustaceans | Description: One or two mixed baskets of fish were caught on each haul made in the Outer Silver Pit with varying numbers of Nephrops |
| Acoustic reflection on marine organisms. | Quantity: number of observations = 36 Description: Shoals seen on the paper record of the Acoustic Arch system |
| Gear research | Quantity: number of experiments = 4 Description: Vertical lowering of the Birmingham univeristy transmitter. 1 experiment carried out to a depth of 40m. The small boat was used twice to take the transmitter some distance from the ship to enable some horizontal propagation measurements to be made |
