Planned maintenance — 18th January 2018 12:00 to 22nd January 2018 09:00 [more]

Cruise inventory

FRV Explorer 1A/69

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier1A/69
Cruise period1969-04-02 — 1969-04-16
Port of departureAberdeen, United Kingdom
Port of returnStornoway, United Kingdom
Objectives1) Plankton and Trawl survey of Rockall Bank to search for concentrations of Blue Whiting eggs
2) The maturities of Blue Whiting were re-examined
3) Ovaries from species in hauls were taken for fecundity estimation
4) Artificial fertilization was carried out on Blue Whiting eggs
5) An egg and larval survey was used to plot the distribution of spawing products
6) A trawling survey to investigate the distribution of lobsters and other large crustaceans at Rockfall was done
7) An Echo-sounder survey was undertaken to identify bottom and mid-water traces
8) Chimaera montrosa was collected for later toxic property investigation
9) A number of less common species were collected to for the investigation of sound-producing musculature

No work was possible till the 04/04/1969 due to rough weather. Gale force winds forced temporary stoppages.
Chief scientistRoger S Bailey (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 1A/69 cruise report explorer1_69.pdf — access key 'C' (0.38 MB) 
Ocean/sea areas 
GeneralNorth Atlantic Ocean
SpecificRockfall Bank, Rockall Channel,
Physical oceanography 
BathythermographQuantity: number of profiles = 52
Description: mechanical
Biology and fisheries 
Eggs and larvaeQuantity: number of specimens = 150
Description: Planktonic eggs. 100-150 per haul were collected
Pelagic fishQuantity: number of hauls = 21
Description: on Rockfall Bank for Blue Whiting. Most trawling was carried out in daylight, and repeated in some to compare day and night catches.
Other biological/fisheries measurementDescription: Catches and trawls included Blue Whiting, Gadiculus, Sliver Smelt species, Haddock