RV Corella 3/76
Cruise summary report
|Ship name (ship code)||RV Corella (74CX)|
|Cruise period||1976-02-18 — 1976-02-28|
|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 multipurpose plankton sampler.
2. Monitor the 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
analyses; 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.
4. Carry out hauls with the Boothbay net to sample young fish.
5. 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.
6. Collect samples of fish for stomach content analysis using the
young gadoid trawl in midwater.
7. Collect live plankton and fish eggs as required.
|Chief scientist||John H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)|
|Cruise report||(0.31 MB)|
|Surface measurements underway (T,S)||Description: S only|
|Water bottle stations||Quantity: number of stations = 7|
Description: T surface
|Transparency (eg transmissometer)||Description: continuous|
|Optics (eg underwater light levels)||Quantity: number of profiles = 3|
Description: light absorption
|Surface drifters/drifting buoys||Quantity: number of deployments = 700|
|Phosphate||Quantity: number of samples = 100|
|Nitrate||Quantity: number of samples = 100|
|Silicate||Quantity: number of samples = 100|
|Biology and fisheries|
|Primary productivity||Description: continuous|
|Phytoplankton pigs (eg chlorophyll, fluorescence)||Description: continuous|
|Phytoplankton||Quantity: number of samples = 114|
|Zooplankton||Quantity: number of samples = 100|
|Eggs and larvae||Quantity: number of samples = 100|
Description: population and environment,distribution
|Pelagic fish||Quantity: number of hauls = 10|
Description: population and environment
|Incident radiation||Description: continuous solarimeter measurements in daylight hours|