Cruise inventory

RV Corella 5/76

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corella (74CX)
Cruise identifier5/76
Cruise period1976-03-26 — 1976-04-13
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. 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 scientistJohn H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corella 5/76 cruise report corella05_76.pdf — access key 'C' (0.47 MB) 
Ocean/sea areas 
GeneralNorth Sea
Track chartsRV Corella 5/76 cruise track — trk1732.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 2222
Water bottle stationsQuantity: 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 buoysQuantity: number of deployments = 700
Description: bottom
Other physical oceanographic measurementsQuantity: number of observations = 206
Description: sea and swell
Chemical oceanography 
OxygenQuantity: track kilometres = 2222.4
PhosphateQuantity: number of samples = 102
NitrateQuantity: number of samples = 102
NitriteQuantity: number of samples = 102
pHQuantity: track kilometres = 2222.4
Trace elementsQuantity: number of samples = 156
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: track kilometres = 2222.4
PhytoplanktonQuantity: number of samples = 102
ZooplanktonQuantity: number of samples = 109
Eggs and larvaeQuantity: number of samples = 109
Description: survey:taxonomy
Pelagic fishQuantity: number of hauls = 11
Incident radiationQuantity: activity duration in days = 17