RV Cirolana CIR4/90
Cruise summary report
| Cruise Info. | |
| Ship name (ship code) | RV Cirolana (74CZ) |
| Cruise identifier | CIR4/90 |
| Cruise period | 1990-04-10 — 1990-04-24 |
| Status | Completed |
| Port of departure | Lowestoft, United Kingdom |
| Port of return | Lowestoft, United Kingdom |
| Purpose | Research |
| Objectives | 1. To determine size fractionated rates of primary production and bacterial production in different light regimes for comparison with similar measurements in previous years from the Irish Sea.
2. To determine the horizontal and vertical distribution of micro and mesozooplankton including fish eggs and larvae in relation to hydrographic conditions. 3. To assess the quality, composition and quality of the various particle size fractions available as food for fish larvae. 4. To measure zooplankton egg production rate as an index of secondary production. 5. To preserve cod and sprat larvae for subsequent determination of gut contents and RNA/DNA, histochemical, biochemical and lipid analyses. 6. To relate primary production, phytoplankton biomass and species composition to the vertical structure, behaviour and feeding of the herbivorous zooplankton. |
| Chief scientist | John H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory) |
| Cruise report |  (0.22 MB) |
| Ocean/sea areas | |
| General | North Sea |
| Specific | North Sea |
| Track charts |  |
| Measurements | |
| Physical oceanography | |
| CTD stations | Quantity: number of stations = 133 Description: Vertical CTD profiles |
| Contamination | |
| Suspended matter | Quantity: activity duration in days = 14 Description: Continuous monitoring of suspended solids |
| Trace metals | Quantity: number of stations = 105 Description: Chlorophyll 'a' profiles |
| Biology and fisheries | |
| Primary productivity | Quantity: number of stations = 9 Description: Primary production |
| Phytoplankton | Quantity: number of stations = 149 Description: plankton studies |
| Zooplankton | Quantity: number of stations = 149 Description: plankton studies |
