RV Corella 2B/76
Cruise summary report
|Ship name (ship code)||RV Corella (74CX)|
|Cruise period||1976-01-28 — 1976-02-11|
|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 phytoplankton
using the Lowestoft multipurpose plankton sampler.
2. Monitor the sub-surface water continuously 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 phytoplankton contribution to chlorophyll
'a' fluorescence, including the preparation of slides for electron
microscope examination of micro flagellates.
4. Carry out replicate hauls with the Multipurpose plankton sampler
near a parachute drogue to estimate sampling errors.
5. Test the possibility of carrying out alternate hauls with the high
speed plankton sampler and the Boothbay Net.
6. Collect samples with the changing net sampler to investigate vertical
distribution of fish eggs and larvae and 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 hours period.
7. Collect samples of fish for stomach content analysis using the
young gadoid trawl in mid-water.
8. Collect live plankton and fish eggs as required.
|Chief scientist||Derek Harding (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)|
|Cruise report||(0.28 MB)|
|Surface measurements underway (T,S)||Quantity: track kilometres = 2129|
|Water bottle stations||Quantity: number of stations = 70|
Description: surface only
|Transparency (eg transmissometer)||Quantity: track kilometres = 2129.8|
|Optics (eg underwater light levels)||Quantity: number of profiles = 1|
|Surface drifters/drifting buoys||Quantity: number of deployments = 700|
|Oxygen||Quantity: track kilometres = 2129.8|
|Phosphate||Quantity: number of stations = 70|
|Nitrate||Quantity: number of stations = 70|
|Nitrite||Quantity: number of stations = 70|
|Silicate||Quantity: number of stations = 70|
|pH||Quantity: track kilometres = 2129.8|
|Biology and fisheries|
|Phytoplankton pigs (eg chlorophyll, fluorescence)||Quantity: track kilometres = 2129.8|
|Phytoplankton||Quantity: number of stations = 70|
|Zooplankton||Quantity: number of hauls = 75|
|Eggs and larvae||Quantity: number of hauls = 75|
Description: distribution,biomass determination,communities
|Pelagic fish||Quantity: number of hauls = 3|
|Incident radiation||Quantity: activity duration in days = 14|