Cruise inventory

FRV Explorer 3/74

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier3/74
Cruise period1974-04-03 — 1974-05-01
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
ObjectivesTo study the patchiness of gadoid larvae in relation to environmental factors, particularly their food supply.

A preliminary survey was carried out to 15 miles either side of the line of current meter moorings 30 minutes East, between 58 degrees North and 61 degrees North. Weather prevented stations on the third survey being worked northwards and instead the continuous survey techniques were used on the return passage. ''Explorer'' went to Lerwick from the 11/04/1974 till the 12/04/1974 to take 2 crew members in need of medical attention. A mid cruise break was made on the 16/04/1974 till the 18/04/1974. During 15/04/1974 to the 24/04/1974 FRV Clupea worked in association with Explorer.
Chief scientistJames A Adams (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory), John H Steele (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 3/74 cruise report explorer3_74.pdf — access key 'C' (0.18 MB) 
Ocean/sea areas 
Norwegian Sea
Physical oceanography 
Surface measurements underway (T,S)Description: Monitored continuously with a thermosalinograph.
Water bottle stationsQuantity: number of stations = 57
Description: Surface samples of water for salinity, nitrate and chlorophyll determination were collected from the pumped supply for the calibration of the continuous recorders
Surface drifters/drifting buoysQuantity: 13
Description: drogues(mid-water). 4 parachute drogues were deployed 60 degrees 30 minutes North
Chemical oceanography 
NitrateQuantity: 57
Description: Surface nitrate monitored continuously with a autoanalyser
SilicateQuantity: 1
Biology and fisheries 
Primary productivityQuantity: 57
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: Chlorophyll-a monitored continuously with a fluorometer
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: 57
PhytoplanktonQuantity: number of samples = 73
Description: species idenification from sedimentation samples
ZooplanktonQuantity: number of hauls = 590
Description: Sampled with oblique hauls at half hour intervals of a high speed double net
Eggs and larvaeQuantity: track kilometres = 1093
Description: A study of the depth distribution of gadoid larvae using a Hardy-Longhurst sampler and a vertical closing net.