Cruise inventory

Tridens (68-91)

Cruise summary report

Cruise Info. 
Ship name (ship code)Tridens (68-91) (64T0)
Cruise period1979-08-06 — 1979-08-17
StatusCompleted
Port of departureAberdeen, United Kingdom
Port of returnAberdeen, United Kingdom
PurposeResearch
ObjectivesTo observe and measure a semi pelagic trawl for round fish, developed to work in areas with an undulating seabed (sand ridges).
To observe the behaviour of a 6 metre beam trawl giving special attention to the behaviour of flatfish in relation to the tickler chains.
Chief scientistJohn Main (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportTridens (68-91)  cruise report tridens_aug79.pdf — access key 'C' (0.05 MB) 
Ocean/sea areas 
GeneralNorth Sea
Measurements 
Biology and fisheries 
Gear researchDescription: An examination of the semi pelagic trawl was made throughout the cruise. No. of hauls not noted.
Gear researchQuantity: number of images = 2
Description: 30 minute video films were made demonstrating the beam and trawl behaviour.
Gear researchDescription: The beam trawl was surveyed on how it effected the behaviour of flatfish. No. of hauls not noted.
Geology and geophysics 
Bottom photographyQuantity: number of images = 2
Description: 30 minute video films were made demonstrating the beam and trawl behaviour.