RV Corella 5/67
Cruise summary report
|Ship name (ship code)||RV Corella (74CX)|
|Cruise period||1967-09-07 — 1967-09-14|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
|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)|
|Specific||Whitby area, Silver Pit area, Smith's Knoll, Bridlington Bay, and Skate Hole|
|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