Cruise inventory

FRV Explorer 9/74

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier9/74
Cruise period1974-10-09 — 1974-10-23
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeResearch
Objectives1) To undertake a pre-recruit survey of the North Sea fish stocks.
2) Stomachs from selected cod and haddock were brought back for examination
3) Blood smears of cod were collected for Plymouth Polytechnic from various stations in the North Sea
4) Samples of young gadoids from the northern North Sea were preserved for examination for larval nematodes
5) Organisms were collected from the visceral cavities of skate and preserved for future use
6) 0+ group herring were preserved in Bouin's Fluid for histological examination of skin in connection with a biological tag project

Problems with the ship's main generator delayed sailing till the 09/10/1974 and forced an early return
Chief scientistNorman T Nicoll (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 9/74 cruise report explorer9_74.pdf — access key 'C' (0.08 MB) 
Ocean/sea areas 
GeneralNorth Sea
Norwegian Sea
North East Atlantic Ocean (limit 40W)
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: number of hauls = 34
Description: Taken with the Dutch Gulf III high-speed sampler
Water bottle stationsQuantity: number of hauls = 34
Description: Taken with the Dutch Gulf III high-speed sampler
Subsurface temperature and salinity measurementsQuantity: number of hauls = 34
Description: Taken with the Dutch Gulf III high-speed sampler
Biology and fisheries 
Primary productivityQuantity: number of hauls = 33
Description: 1 hour duration.
Phytoplankton pigs (eg chlorophyll, fluorescence)Description: chlorophyll from the pumped non-toxic seawater supply, taken with the Dutch Gulf III high-speed sampler for dry weight determination
Particulate organic matter (inc POC, PON)Quantity: number of samples = 11
Description: carbon from the pumped non-toxic seawater supply taken with the Dutch Gulf III high-speed sampler for dry weight determination
PhytoplanktonQuantity: number of samples = 14
Description: Obtained from standard net hauls for dry weight determination
ZooplanktonQuantity: 14
Description: taken with the Dutch Gulf III high-speed sampler for dry weight determination
Demersal fishQuantity: number of hauls = 33
Description: 1 hour duration made with the 48 ft Aberdeen trawl fitted with a small mesh cover. A codend mesh size of 74.4 mm.. Haddock and whiting were caught