Planned maintenance — 18th January 2018 12:00 to 22nd January 2018 09:00 [more]

Cruise inventory

RV Corella 12A/76

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Corella (74CX)
Cruise identifier12A/76
Cruise period1976-09-03 — 1976-09-15
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. To carry out a survey for herring larvae i n the western half of the central North Sea, as part of an international survey of the abundance and distribution of autumn-spawned herring larvae in the North Sea and adjacent waters, using the Lowestoft multipurpose plankton sampler.
2. To investigate the abundance and distribution of planktonic fish eggs and larvae, zooplankton predators and competitors and the phytoplankton.
3. Monitor sub-surface water continuously along the ship's track for temperature, salinity, transparency and chlorophyll 'a'.
4. 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' fluorescence, including the preparation of slides for electron microscope examination of the micro-flagellates.
5. Carry out hauls with the 2 sq m Lowestoft frame trawl to sample young fish.
6. Carry out hauls with the 2 m diameter ring net within 10 miles of the coast, to sample lobster larvae.
7. Use the changing net sampler to investigate the vertical distribution of herring larvae and other zooplankton.
8. Continue estimating sampling variance by carrying out replicate hauls with the multi-purpose plankton sampler.
9. To release 700 seabed drifters at 14 standard stations on the plankton survey grid.
Chief scientistR J Wood (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Corella 12A/76 cruise report corella12a_76.pdf — access key 'C' (0.24 MB) 
Ocean/sea areas 
GeneralNorth Sea
Track chartsRV Corella 12A/76 cruise track — trk1739.html
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of measurements = 124
Description: (survey grid)
Water bottle stationsQuantity: number of stations = 124
Description: surface only
Transparency (eg transmissometer)Quantity: number of measurements = 124
Description: (survey grid)
Optics (eg underwater light levels)Quantity: number of profiles = 2
Description: (spectral radiometer)
Surface drifters/drifting buoysQuantity: number of deployments = 750
Description: bottom
Other physical oceanographic measurementsQuantity: number of observations = 124
Description: sea and swell
Chemical oceanography 
OxygenQuantity: number of samples = 124
Description: (survey grid)
PhosphateQuantity: number of samples = 70
NitrateQuantity: number of samples = 70
NitriteQuantity: number of samples = 70
SilicateQuantity: number of samples = 70
pHQuantity: number of measurements = 124
Description: (survey grid)
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of samples = 124
PhytoplanktonQuantity: number of samples = 124
ZooplanktonQuantity: number of samples = 131
NeustonQuantity: number of samples = 15
Eggs and larvaeQuantity: number of samples = 124
Description: survey:taxonomy etc.
Pelagic fishQuantity: number of hauls = 22
Description: frame trawl
Incident radiationQuantity: activity duration in days = 10
Description: (solarimeter)