RV Corella 11/76
Cruise summary report
|Ship name (ship code)||RV Corella (74CX)|
|Cruise period||1976-08-12 — 1976-08-26|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
|Objectives||1. To 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.
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 analysis; calibrate the fluoroneter 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. Carry out hauls with the 2 m diameter ring net within 10 miles of the coast, to sample lobster larvae.
6. 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 h period.
7. Continue estimating sampling variance by carrying out replicate hauls and replicate grids with the multi-purpose plankton sampler.
8. Collect samples of fish for stomach content analysis, using the young gadoid midwater trawl.
9. Collect live plankton as required.
10. Collect fish samples (frozen) for metal analysis.
11. Carry out a Nansen water bottle series, for temperature and salinity at 10 m depth intervals, at the position of the River
Tyne moored current meter station, and to release 100 seabed drifters at this point.
12. To release 700 seabed drifters at 14 standard stations on the plankton survey grid.
|Chief scientist||John H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)|
|Cruise report||(0.44 MB)|
|Surface measurements underway (T,S)||Quantity: track kilometres = 2479|
|Water bottle stations||Quantity: number of stations = 94|
|Transparency (eg transmissometer)||Quantity: track kilometres = 2479.828|
|Optics (eg underwater light levels)||Quantity: number of profiles = 4|
|Surface drifters/drifting buoys||Quantity: number of deployments = 800|
|Other physical oceanographic measurements||Quantity: number of observations = 153|
Description: sea and swell
|Oxygen||Quantity: track kilometres = 2479.828|
|Phosphate||Quantity: number of samples = 94|
|Nitrate||Quantity: number of samples = 94|
|Nitrite||Quantity: number of samples = 94|
|Silicate||Quantity: number of samples = 94|
|pH||Quantity: track kilometres = 2479.828|
|Biology and fisheries|
|Phytoplankton pigs (eg chlorophyll, fluorescence)||Quantity: track kilometres = 2479.828|
|Phytoplankton||Quantity: number of samples = 94|
|Neuston||Quantity: number of samples = 47|
|Eggs and larvae||Quantity: number of samples = 101|
Description: survey:taxonomy etc.
|Pelagic fish||Quantity: number of hauls = 57|
|Incident radiation||Quantity: activity duration in days = 14|