Cruise inventory

FRV Mara 6/75

Cruise summary report

Cruise Info. 
Ship name (ship code)FRV Mara (74MR)
Cruise identifier6/75
Cruise period1975-06-26 — 1975-07-04
Objectives1) To evaluate the general fish techniques for fish behaviour studies on pelagic gears
2) To compare the behaviour of fish towards
a) a standard trawl comprising of panels of different mesh size
b) a trawl with gradually decreasing mesh size laong its length
3) To determine the overall geometry of the gears in relation to their design
4) A echo-sounder survey was done to seek sprat concentrations.

Poor weather curtailed diving operations on the 26/06/1975. Diving operations recommenced on the 27/06/1975 and continued till the end of the cruise
Chief scientistS T Ronald de Silva (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
Cruise reportFRV Mara 6/75 cruise report mara6_75.pdf — access key 'C' (0.21 MB) 
Ocean/sea areas 
GeneralNorth Sea
Biology and fisheries 
Gear researchQuantity: number of dives = 37
Description: Diver observations made on the Grad 1 m and Mk 1m gears. Depth readings and photographs were taken at various points on the gear and related to the design of the net. Cine photography was used to record flow patterns around the doors and net made visible by dye columns