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Cruise inventory

RRS Challenger CH29

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Challenger (74CH)
Cruise identifierCH29
Cruise period1988-05-21 — 1988-06-04
Port of departurePlymouth, United Kingdom
Port of returnTroon, United Kingdom
Objectives1. To determine size fractionated rates of phytoplankton production in different light regimes and bacterial production - to relate these to the production and flux of organic matter by various components of the pelagic ecosystem.
2. To relate primary production, phytoplankton biomass and species composition to the vertical structure, behaviour and feeding of the herbivorous zooplankton.
3. To determine the horizontal and vertical distribution of micro and mesozooplankton including fish and eggs larvae, in relation to hydrographic conditions.
4. To assess the quantity, composition (species identification) and quality of the various particle size fractions available as food for fish larvae. Analyses:- dissolved free amino acids, vitamins, polyunsaturated fatty acids, carbon (POC, PC) nitrogen, ash free dry weight and pigments in various size classes of particulates and in fish larvae and eggs.
5. Fish larvae will be collected and stored in liquid nitrogen for determination of gut contents, RNA/DNA and biochemical analysis.
Chief scientistBob Williams (Plymouth Marine Laboratory)
Cruise reportRRS Challenger CH29 cruise report ch29_88.pdf — access key 'C' (0.50 MB) 
Ocean/sea areas 
GeneralIrish Sea and St. George's Channel
SpecificIrish Sea
Physical oceanography 
CTD stationsQuantity: number of profiles = 52
Description: disc
Subsurface temperature and salinity measurementsQuantity: number of stations = 13
Optics (eg underwater light levels)Quantity: number of stations = 4
Chemical oceanography 
PhosphateQuantity: number of stations = 8
NitrateQuantity: number of stations = 8
NitriteQuantity: number of stations = 8
SilicateQuantity: number of stations = 8
Biology and fisheries 
Primary productivityQuantity: number of stations = 8
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 52
Particulate organic matter (inc POC, PON)Quantity: number of stations = 52
Biochemical measurements (eg lipids, amino acids)Quantity: number of stations = 52
PhytoplanktonQuantity: number of stations = 7
ZooplanktonQuantity: number of hauls = 110
Description: distribution,description of communities
SestonQuantity: number of stations = 52
Description: disc
Eggs and larvaeQuantity: number of stations = 7
Pelagic bacteria/micro-organismsQuantity: number of stations = 20
Other biological/fisheries measurementQuantity: number of stations = 52
Description: vitamin concentrations