Cruise inventory

FRV Explorer 4B/67

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Explorer (74EX)
Cruise identifier4B/67
Cruise period1967-05-02 — 1967-05-18
StatusCompleted
Port of departureGreenock, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeResearch
Objectives1) To obtain accurate information on the depth distribution of blue whiting larvae
2) Trawling
3) Gear testing of the bottom trawl
4) The Marconi Fishgraph was run almost continuously during the whole trip
5) An echo plankton grid of the area 100 miles SE of Rockall Bank was started on the 08/06/1967 until the 14/06/1967
6) Information on the declination and divergence of the warps etc were collected
7) Samples of Argentina Silus and blue whiting were deep frozen for analysis in the laboratory and several of the less common dogsfishes were also kept
8) An echo/plankton survey of the whole of Rockall Bank was carried out. A plot of blue whiting in an area of high abundance was done

Trawling did not start on the Rockall Bank till the 07/06/1967. The underwater camera was fitted to the headline of the trawl for the 6 hauls carried out at the 24 hour station.
Chief scientistD Ferrier S Raitt (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Explorer 4B/67 cruise report explorer4_67.pdf — access key 'C' (0.76 MB) 
Ocean/sea areas 
GeneralNorth Sea
Specific100 miles SE of Rockall Bank, Anton Dohrn Bank, St. Kilda, north of Rosemary Bank, Wyville Thomson Ridge
Track chartsFRV Explorer 4B/67 cruise track — explorer4_67track.pdf (0.46 MB) 
Measurements 
Biology and fisheries 
Eggs and larvaeDescription: Vertical WP3 plankton hauls taken every 4 hours to 25, 50, 75, 100, 150 m. Occasional comparative hauls were taken with the Gulf III
Pelagic fishDescription: Fishing on Rockall: blue whiting 16-56 baskets per 1 hour's trawl, by catchesof haddock averaging 7 baskets per hour. 2 baskets of Chimaera were taken, 1 preserved in formalin
Demersal fishDescription: Fishing on Rockall: blue whiting 16-56 baskets per 1 hour's trawl, by catchesof haddock averaging 7 baskets per hour. 2 baskets of Chimaera were taken, 1 preserved in formalin