RRS Frederick Russell FR9/84

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Frederick Russell (74GG)
Cruise identifierFR9/84
Cruise period1984-05-19 — 1984-06-02
Port of departureFalmouth, United Kingdom
Port of returnPlymouth, United Kingdom
Objectives(a) To determine the horizontal and vertical distribution of eggs and larvae of mackerel across the shelf, shelf-break and open ocean and relate their distribution to environmental variables.
(b) To determine the food and feeding rhythm of mackerel larvae (from gut analysis) over 24 hour periods and to relate their vertical distribution and migration to food availability.
(c) To determine rates of phytoplankton and bacterial production and relate these to the production and flux of organic matter by various components of the pelagic system.
(d) To relate primary production to the vertical structure, behaviour and feeding processes of the herbivorous zooplankton.
(e) To quantify and qualify the faecal pellets produced within the euphotic zone and their sedimentation rate.
(f) To investigate, by laboratory experiments onboard the feeding by mackerel larvae on concentrations of natural particulates, cultured diatoms and various size ranges of faecal pellets.
Chief scientistBob Williams (Institute of Marine Environmental Research, Plymouth)
Cruise reportRRS Frederick Russell FR9/84 cruise report frederick_russell9_84.pdf (0.26 MB) 
Ocean/sea areas 
GeneralCeltic Sea
Bay of Biscay
North East Atlantic Ocean (limit 40W)
SpecificS.W. Approaches/ S. Ireland/Biscay
Track chartsRRS Frederick Russell FR9/84 cruise track — trk3291.html
Physical oceanography 
Surface measurements underway (T,S)Description: UOR,thermosalinograph
BathythermographQuantity: number of profiles = 26
Water bottle stationsQuantity: number of stations = 14
Description: vertical profiles with samples
Chemical oceanography 
PhosphateQuantity: number of stations = 14
NitrateQuantity: number of stations = 14
NitriteQuantity: number of stations = 14
SilicateQuantity: number of stations = 14
Biology and fisheries 
Primary productivityQuantity: number of stations = 8
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: fluorescence,UOR
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 14
Description: chlorophyll (a) stations UOR
Particulate organic matter (inc POC, PON)Quantity: number of stations = 14
PhytoplanktonQuantity: number of stations = 14
ZooplanktonQuantity: number of hauls = 12
Description: Longhurst-Hardy plankton recorder (LHPR) oblique hauls
Eggs and larvaeDescription: survey:distribution,energy transfers,population structures
Pelagic bacteria/micro-organismsQuantity: number of stations = 14
Other biological/fisheries measurementDescription: feeding experiments
Other biological/fisheries measurementQuantity: number of stations = 14
Description: particle size