RV Corella 12A/76
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RV Corella (74CX) |
| Cruise identifier | 12A/76 |
| Cruise period | 1976-09-03 — 1976-09-15 |
| Status | Completed |
| Port of departure | Lowestoft, United Kingdom |
| Port of return | Lowestoft, United Kingdom |
| Purpose | Research |
| Objectives | 1. To carry out a survey for herring larvae i n the western half of the central North Sea, as part of an international survey of the abundance and distribution of autumn-spawned herring larvae in the North Sea and adjacent waters, using the Lowestoft multipurpose plankton sampler.
2. To investigate the abundance and distribution of planktonic fish eggs and larvae, zooplankton predators and competitors and the phytoplankton. 3. Monitor sub-surface water continuously along the ship's track for temperature, salinity, transparency and chlorophyll 'a'. 4. Collect water samples from the pump for salinity and nutrient analysis; calibrate the fluorometer with chlorophyll 'a' extracts; measure phaeophytin and identify the phytoplankton contribution to chlorophyll 'a' fluorescence, including the preparation of slides for electron microscope examination of the micro-flagellates. 5. Carry out hauls with the 2 sq m Lowestoft frame trawl to sample young fish. 6. Carry out hauls with the 2 m diameter ring net within 10 miles of the coast, to sample lobster larvae. 7. Use the changing net sampler to investigate the vertical distribution of herring larvae and other zooplankton. 8. Continue estimating sampling variance by carrying out replicate hauls with the multi-purpose plankton sampler. 9. To release 700 seabed drifters at 14 standard stations on the plankton survey grid. |
| Chief scientist | R J Wood (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory) |
| Cruise report |  (0.24 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: number of measurements = 124 Description: (survey grid) |
| Water bottle stations | Quantity: number of stations = 124 Description: surface only |
| Transparency (eg transmissometer) | Quantity: number of measurements = 124 Description: (survey grid) |
| Optics (eg underwater light levels) | Quantity: number of profiles = 2 Description: (spectral radiometer) |
| Surface drifters/drifting buoys | Quantity: number of deployments = 750 Description: bottom |
| Other physical oceanographic measurements | Quantity: number of observations = 124 Description: sea and swell |
| Chemical oceanography | |
| Oxygen | Quantity: number of samples = 124 Description: (survey grid) |
| Phosphate | Quantity: number of samples = 70 |
| Nitrate | Quantity: number of samples = 70 |
| Nitrite | Quantity: number of samples = 70 |
| Silicate | Quantity: number of samples = 70 |
| pH | Quantity: number of measurements = 124 Description: (survey grid) |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: number of samples = 124 |
| Phytoplankton | Quantity: number of samples = 124 |
| Zooplankton | Quantity: number of samples = 131 |
| Neuston | Quantity: number of samples = 15 |
| Eggs and larvae | Quantity: number of samples = 124 Description: survey:taxonomy etc. |
| Pelagic fish | Quantity: number of hauls = 22 Description: frame trawl |
| Meteorology | |
| Incident radiation | Quantity: activity duration in days = 10 Description: (solarimeter) |
