Cruise inventory

RV Corella 5/67

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corella (74CX)
Cruise identifier5/67
Cruise period1967-09-07 — 1967-09-14
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. 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 scientistRonald B Mitson (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corella 5/67 cruise report corella05_67.pdf — access key 'C' (0.21 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificWhitby area, Silver Pit area, Smith's Knoll, Bridlington Bay, and Skate Hole
Biology and fisheries 
Pelagic fishQuantity: 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 fishQuantity: sample baskets = 2
Description: Herring caught in the Outer Silver Pit
CrustaceansDescription: 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 researchQuantity: 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