Cruise inventory

FRV Explorer 4A/77

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier4A/77
Cruise period1977-05-02 — 1977-05-06
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeResearch
ObjectivesThe cruise was arranged at short notice in response to the Ekofisk blow-out as a joint study by the Marine Laboratory and Torry Research Station

1) To make observations on the contamination of water and fish in the area of the slick with comparison with conditions in the UK sector of the North Sea
2) To undertake limited experimental work to assess effects on marine life
3) At station 1, specimens of 6 fish species (haddock, whiting, gurnard, lemon sole, mackerel, and plaice) and 1 invertebrate (Modiolus) were kept and samples of microbes, plankton and benthos were taken for experiments to be conducted at Ekofisk
4) At stations 3 and 6, serial sampling was done throughout the water column for temperature, salinity, and chlorophyll to determine the depth of mixing
Chief scientistAlasdair D McIntyre (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 4A/77 cruise report explorer_may77.pdf — access key 'C' (1.29 MB) 
Ocean/sea areas 
GeneralNorth Sea
SpecificEkofisk area
Track chartsFRV Explorer 4A/77 cruise track — explorer_may77track.pdf (1.06 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 2
Description: At 6 positions between depth and bottom
Contamination 
Chlorinated hydrocarbons
Contaminants in organismsQuantity: number of deployments = 5
Description: Sediment trap and mussel cages were used in area of pollution of the Ekofisk blowout
Other contaminant measurementsDescription: waste water:microbiology
Biology and fisheries 
Primary productivityQuantity: 2
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: 2
ZooplanktonDescription: feeding
NektonQuantity: number of hauls = 4
Description: 1 hour duration. Selected specimens collected for hydrocarbon analysis and organoleptic tests. Haddock, whiting, gurnard, plaice and lemon sole caught
Zoobenthos
Demersal fishQuantity: number of hauls = 4
Description: 1 hour duration. Selected specimens collected for hydrocarbon analysis and organoleptic tests. Haddock, whiting, gurnard, plaice and lemon sole caught