FRV Explorer 2/80

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier2/80
Cruise period1980-01-30 — 1980-02-10
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
Objectives1) To take part in the International Young Herring and Gadoid Pre-recruit Survey in the North Sea.
2) To determine the age composition of cod, haddock, saithe, and whiting for each block of squares.
3) To undertake, on completion of the International Survey, two trauls per statistical square in the blocks numbered 1-3

12 stations were completed. A total of 57 valid hauls were made during both parts of the cruise using the GOV trawl and 2912 otoliths taken from cod, haddock, and whiting were read at sea. Material was collected for use in multispecies models. Maturities of haddock and whiting to determine the age at first spawning were recorded at stations north of 59 degrees, 30 minutes. Invertrbrates were taken in very small numbers throughout most of the cruise.
Chief scientistArthur S Jermyn (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Coordinating bodyICES
Cruise reportFRV Explorer 2/80 cruise report explorer2and3_80.pdf (4.11 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificN. Scotland/ Shetlands, Danish coast, English coast (wash area)
Track chartsFRV Explorer 2/80 cruise track — explorer2_80track.pdf (2.64 MB) 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 23
Description: top & bottom temperature and salinities
Chemical oceanography 
PhosphateQuantity: 4
NitrateQuantity: 4
AmmoniaQuantity: 4
SilicateQuantity: 4
Trace metalsQuantity: 12
Biology and fisheries 
Eggs and larvaeQuantity: 19
Pelagic fishQuantity: number of hauls = 25
Description: biomass determination,population structures
Demersal fishQuantity: number of hauls = 25
Description: Samples of haddock, hake, ling, and whiting for the measurement of total nitrogen content were deep frozen for Dr Mackie of the Torry Research Station.
CrustaceansQuantity: 25