Cruise inventory

FRV Explorer 9/72

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier9/72
Cruise period1972-10-14 — 1972-10-31
StatusCompleted
Port of returnLeith, United Kingdom
PurposeResearch
Objectives1) Northern North Sea pre-recruit survey
2) Comparative trawling exercise with the Russian vessel ''Langust'' to carry out 12 comparative trawls at stations south and south east of Shetland

The development of a defect in the ship's rudder and palastre pin meant the cruise terminated earlier than planned. Rough weather also curtailed the sampling programme
Chief scientistRichard B Burns (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 9/72 cruise report explorer9_72.pdf — access key 'C' (0.20 MB) 
Ocean/sea areas 
GeneralNorth Sea
Norwegian Sea
SpecificShetland area, E of Aberdeenshire, E of Fair Isle, Fladen Ground, E of Balta, western edge of the Norwegian Deeps
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 32
Description: subsurface temperature, surface salinity
Subsurface temperature and salinity measurementsQuantity: number of stations = 32
Description: subsurface temperature, surface salinity
Chemical oceanography 
PhosphateQuantity: number of stations = 32
NitrateQuantity: number of stations = 32
AmmoniaQuantity: number of stations = 32
SilicateQuantity: number of stations = 32
Biology and fisheries 
Primary productivityQuantity: number of stations = 32
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 32
Description: chlorophyll
PhytoplanktonQuantity: number of hauls = 9
Description: Oblique. Made with the Dutch Gulf III at all stations and catches were deep frozen for dry weight determination
ZooplanktonQuantity: number of stations = 32
Pelagic fishQuantity: number of hauls = 35
Description: 1 hour duration using the 48 ft Aberdeen trawl with small mesh cover. A cod-end mesh size of 3 and a half inches was used for the first 26 trawls and changed to one of 3 inches for the remainder. Haddock was the dominant species followed by whiting, cod, saithe, industrial species, monkfish and flatfish. Herring and sprat were also caught
Demersal fishQuantity: number of hauls = 35
Description: 1 hour duration using the 48 ft Aberdeen trawl with small mesh cover. A cod-end mesh size of 3 and a half inches was used for the first 26 trawls and changed to one of 3 inches for the remainder. Haddock was the dominant species followed by whiting, cod, saithe, industrial species, monkfish and flatfish. Herring and sprat were also caught
TaggingsDescription: 28 plaice, 8 lemon sole.