RV Corella 5/76
Cruise summary report
|Ship name (ship code)||RV Corella (74CX)|
|Cruise period||1976-03-26 — 1976-04-13|
|Port of departure||Lowestoft, United Kingdom|
|Port of return||Lowestoft, United Kingdom|
|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.
2. Monitor the sub-surface water continuously along the ship's teack for temperature, salinity, transparency and chlorophyll 'a'.
3. 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' fluoresence, including the preparation of slides for electron microscope examination of the micro-flagellates.
4. Collect surface and bottom water samples at selected grid stations for analysis of selected trace metals.
5. Collect surface water samples between the mouth of the Humber and Goole, and over a 13 hour tidal cycle at Goole, for analysis of selected trace metals.
6. To test the rig of, and calibrate the small Boothbay net and to sample young fish with it.
7. Use the changing net sampler to investigate vertical distribution of fish eggs and larvae and the zooplankton, alternating with water bottle casts for phytoplankton, chlorophyll 'a' and phaeophytin in relation to temperature and light penetration into the water column over a 26 hour period.
8. To carry out replicate hauls with the multi-purpose plankton sampler near a parachute drogue, in areas of high and low larval densities, to estimate haul-to-haul variation.
9. To survey a grid of 10 to 15 stations twice, near an egg/larval density gradient at the centre of the patch, to estimate sampling errors.
10. Collect samples of fish for stomach content analysis, using the young gadoid trawl in midwater.
11. Collect live plankton as required.
|Chief scientist||John H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)|
|Cruise report||(0.47 MB)|
|Surface measurements underway (T,S)||Quantity: track kilometres = 2222|
|Water bottle stations||Quantity: number of stations = 7|
Description: 156 S surface 109 surface ICES
|Transparency (eg transmissometer)||Quantity: track kilometres = 2222.4|
|Optics (eg underwater light levels)||Quantity: number of profiles = 8|
|Surface drifters/drifting buoys||Quantity: number of deployments = 700|
|Other physical oceanographic measurements||Quantity: number of observations = 206|
Description: sea and swell
|Oxygen||Quantity: track kilometres = 2222.4|
|Phosphate||Quantity: number of samples = 102|
|Nitrate||Quantity: number of samples = 102|
|Nitrite||Quantity: number of samples = 102|
|pH||Quantity: track kilometres = 2222.4|
|Trace elements||Quantity: number of samples = 156|
|Biology and fisheries|
|Phytoplankton pigs (eg chlorophyll, fluorescence)||Quantity: track kilometres = 2222.4|
|Phytoplankton||Quantity: number of samples = 102|
|Zooplankton||Quantity: number of samples = 109|
|Eggs and larvae||Quantity: number of samples = 109|
|Pelagic fish||Quantity: number of hauls = 11|
|Incident radiation||Quantity: activity duration in days = 17|