Cruise inventory

FRV Explorer 3/72

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier3/72
Cruise period1972-04-19 — 1972-05-02
StatusCompleted
PurposeResearch
Objectives1) Routine North Sea trawl survey
2) Environmental observations
3) Lay current meter moorings (omitted due to curlailment of cruise)

Recruit haddock were well represented in practically every haul of the valid 42 trawls made with the 48' Aberdeen trawl. Recruit stocks were sampled in the Moray Firth, East and Orkney grounds. Non-recruit and industrial fish species were also sampled. Samples of gadoids (fillet,liver, kidney) were preserved for trace metals analysis. Whiting were examined for infestation with the oestode Gilguinia squali as part of the Parasitology Section's biological tag programme. Numerous other specimens were kept for the examination of parasites etc. Plankton was sampled using the Dutch Gulf III sampler
Chief scientistRobert Johnston (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 3/72 cruise report explorer3_72.pdf — access key 'C' (0.12 MB) 
Ocean/sea areas 
GeneralNorth Sea
Norwegian Sea
SpecificFladen area, Ling Bank, Shetland, Orkney, main island coasts, Moray Firth,
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Description: thermosalinograph.
BathythermographQuantity: number of profiles = 40
Description: mechanical
Water bottle stationsQuantity: number of stations = 40
Description: water bottle samples were taken for phosphate, nitrate, nitrite, ammonia and silicate analysis. Pump samples were filtered for particulate carbon and chlorophyll determinations.
Chemical oceanography 
PhosphateQuantity: 40
NitrateQuantity: 40
NitriteQuantity: 40
SilicateQuantity: 39
Trace elementsQuantity: number of samples = 12
Description: Sea water samples (41, unfiltered) were treated for mercury analysis on board ship
Contamination 
Other contaminant measurementsDescription: parallel samples of whole fish kept for pesticides and pcb's analysis
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 40
Description: water bottle samples were taken for phosphate, nitrate, nitrite, ammonia and silicate analysis. Pump samples were filtered for particulate carbon and chlorophyll determinations.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 40
Description: water bottle samples were taken for phosphate, nitrate, nitrite, ammonia and silicate analysis. Pump samples were filtered for particulate carbon and chlorophyll determinations.
PhytoplanktonQuantity: 13
Description: standard net trawl
ZooplanktonQuantity: 40
Description: dry weight;gulf 3 type sampler
BirdsQuantity: 42
Pelagic fishQuantity: number of hauls = 42
Description: Herring, mackerel
Other biological/fisheries measurementDescription: biological pollutants