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

Cruise inventory

RV Cirolana CIR4/90

Cruise summary report

Cruise Info. 
Ship name (ship code)RV Cirolana (74CZ)
Cruise identifierCIR4/90
Cruise period1990-04-10 — 1990-04-24
Port of departureLowestoft, United Kingdom
Port of returnLowestoft, United Kingdom
Objectives1. 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 scientistJohn H Nichols (Ministry of Agriculture, Fisheries and Food Lowestoft Fisheries Laboratory)
Cruise reportRV Cirolana CIR4/90 cruise report ci4_90.pdf — access key 'C' (0.22 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificNorth Sea
Track chartsRV Cirolana CIR4/90 cruise track — trk3554.html
Physical oceanography 
CTD stationsQuantity: number of stations = 133
Description: Vertical CTD profiles
Suspended matterQuantity: activity duration in days = 14
Description: Continuous monitoring of suspended solids
Trace metalsQuantity: number of stations = 105
Description: Chlorophyll 'a' profiles
Biology and fisheries 
Primary productivityQuantity: number of stations = 9
Description: Primary production
PhytoplanktonQuantity: number of stations = 149
Description: plankton studies
ZooplanktonQuantity: number of stations = 149
Description: plankton studies