Cruise inventory

RV Corella 11/76

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corella (74CX)
Cruise identifier11/76
Cruise period1976-08-12 — 1976-08-26
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. 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 scientistJohn H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corella 11/76 cruise report corella11_76.pdf — access key 'C' (0.44 MB) 
Ocean/sea areas 
GeneralNorth Sea
Track chartsRV Corella 11/76 cruise track — trk1738.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 2479
Water bottle stationsQuantity: number of stations = 94
Description: surface
Transparency (eg transmissometer)Quantity: track kilometres = 2479.828
Optics (eg underwater light levels)Quantity: number of profiles = 4
Description: (spectroradiometer)
Surface drifters/drifting buoysQuantity: number of deployments = 800
Description: bottom
Other physical oceanographic measurementsQuantity: number of observations = 153
Description: sea and swell
Chemical oceanography 
OxygenQuantity: track kilometres = 2479.828
PhosphateQuantity: number of samples = 94
NitrateQuantity: number of samples = 94
NitriteQuantity: number of samples = 94
SilicateQuantity: number of samples = 94
pHQuantity: track kilometres = 2479.828
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: track kilometres = 2479.828
PhytoplanktonQuantity: number of samples = 94
NeustonQuantity: number of samples = 47
Eggs and larvaeQuantity: number of samples = 101
Description: survey:taxonomy etc.
Pelagic fishQuantity: number of hauls = 57
Incident radiationQuantity: activity duration in days = 14