RV Corella 8/76
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RV Corella (74CX) |
| Cruise identifier | 8/76 |
| Cruise period | 1976-05-27 — 1976-06-06 |
| Status | Completed |
| Port of departure | Lowestoft, United Kingdom |
| Port of return | Lowestoft, United Kingdom |
| Purpose | Research |
| Objectives | 1. Investigate the distribution and abundance of planktonic fish eggs and larvae, zooplankton predators and competitors and the phytoplankton using the Lowestoft Multi-purpose plankton sampler. Including replicate hauls for variance estimates.
2. Monitor sub-surface water continuously along the ship's track for temperature, salinity transparency and chlorophyll 'a'. 3. Collect water samples from the pump for salinity and nutrient analyses; 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. 4. Carry out hauls with the 2 sq m Lowestoft frame trawl to sample young fish. 5. Use the changing net sampler to investigate the vertical distribution of fish larvae and other zooplankton, alternating with water bottle casts for phytoplankton, chlorophyll 'a' and phaeophytin in relation to temperature and light penetration in the water column over a 26-hour period. 6. Collect samples of fish for stomach content analysis, using the young gadoid midwater trawl. 7. To continue estimating sampling variation by carrying out replicate hauls and replicate grids with the multi-purpose plankton sampler. 8. Collect live plankton as required. 9. Collect fish samples (frozen) for metal analysis. |
| Chief scientist | John H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory) |
| Cruise report |  (0.30 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| Surface measurements underway (T,S) | Quantity: track kilometres = 2114 Description: (survey grid) |
| Water bottle stations | Quantity: number of stations = 4 Description: 93 S surface 93 surface, ICES |
| Transparency (eg transmissometer) | Quantity: track kilometres = 2114.984 Description: (survey grid) |
| Optics (eg underwater light levels) | Quantity: number of profiles = 6 Description: (spectral radiometer) |
| Surface drifters/drifting buoys | Quantity: number of deployments = 800 Description: bottom |
| Other physical oceanographic measurements | Quantity: number of observations = 131 Description: sea and swell |
| Chemical oceanography | |
| Oxygen | Quantity: track kilometres = 2114.984 Description: (survey grid) |
| Phosphate | Quantity: number of samples = 93 |
| Nitrate | Quantity: number of samples = 93 |
| Nitrite | Quantity: number of samples = 93 |
| Silicate | Quantity: number of samples = 93 |
| pH | Quantity: track kilometres = 2114.984 Description: (survey grid) |
| Biology and fisheries | |
| Phytoplankton pigs (eg chlorophyll, fluorescence) | Quantity: track kilometres = 2114.984 Description: (survey grid) |
| Phytoplankton | Quantity: number of samples = 93 |
| Zooplankton | Quantity: number of samples = 100 |
| Eggs and larvae | Quantity: number of samples = 100 Description: survey:taxonomy etc. |
| Pelagic fish | Quantity: number of hauls = 16 |
| Meteorology | |
| Incident radiation | Quantity: activity duration in days = 10 Description: (solarimeter) |
