RV Clione CLI4A/67
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RV Clione (74CN) |
| Cruise identifier | CLI4A/67 |
| Cruise period | 1967-05-29 — 1967-06-07 |
| Status | Completed |
| Port of departure | Lowestoft, United Kingdom |
| Port of return | Lowestoft, United Kingdom |
| Purpose | Research |
| Objectives | 1. Gear trials with the 30" tin tow-net, including tests of the new flow-meter and depth gauges and the net changing mechanism. Trials of a 50" net for fish larvae.
2. To study the vertical distribution of the larvae of plaice and other fish in the Great Orme spawning area, using the changing net. 3. To study the distribution of newly metamorphosed plaice and dab post-larvae between the Great Orme spawning area and Red Wharf Bay, using the sledge net and possibly a 4 metre beam trawl. 4. To compare the catches of newly metamorphosed plaice and dab post-larvae in the sledge net and 4 metre beam rawl in Red Wharf Bay. 5. To study the predation on plaice post-larvae by catching larger fish for stomach content analysis. 6. To release sea-bed drifters between the larval patch and Red Wharf Bay. 7. To carry out a temperature and salinity grid between Point Lynas, the Great Orme and Penmaenmawr. 8. To service the Plessey current meters moored off Red Wharf Bay. 9. If time permits to take samples for phosphate analysiss off the Cumberland coast. A series of trials of a 30-inch tin tow net was carried out with different mesh nets. The stomachs of large numbers of whiting and other fish were examined and many more fish of eight species were preserved for later analysis. The Plessey current meters were recovered instead of being serviced. |
| Chief scientist | J Corlett (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory) |
| Cruise report |  (0.22 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Specific | Great Orme spawning area, Red Wharf Bay, Point Lynas, Penmaenmawr |
| Measurements | |
| Physical oceanography | |
| Subsurface temperature and salinity measurements | Quantity: number of stations = 18 Description: Temperature-Salinity grid: 3 miles apart from Beaumaris Bay to 12 miles offshore |
| Optics (eg underwater light levels) | Quantity: activity duration in hours = 24 Description: Hauls with the closing nets were made every 4 hours over twently-four hours, and light measurements were made after each tow |
| Other physical oceanographic measurements | Quantity: number of stations = 10 Description: 248 Sea-bed drifters were released at stations on the sledge net survey |
| Chemical oceanography | |
| Phosphate | Quantity: number of stations = 33 Description: Phosphate 4-mile grid. 11 stations were series from surface to bottom and the rest were surface samples. 1 sample was taken a mile off the end of the discharge pipeline south of Whitehaven |
| Biology and fisheries | |
| Demersal fish | Quantity: activity duration in hours = 24 Description: Hauls with the closing nets were made every 4 hours over twently-four hours, and light measurements were made after each tow |
| Demersal fish | Quantity: number of specimens = 220 Description: The sledge net was fished alongside the 4m beam trawl towed by 'Tellina' in 4 fathoms. The sledge net caught between 220 and 450 newly metamorphosed dab and plaice post-larvae per tow. A grid of stations was worked out to 25 miles NE of Red Wharf Bay to catch small 0-group fish |
