1. To carry out an echointegrator and midwater trawling survey for 0-group sprats in the western half of the central North Sea.
2. To investigate the depth distribution of 0-group sprats at different times of day and night.
''Explorer'' anchored in the lee of Inchkeith from the 10/11/1981 until the 11/11/1981. A half-landing was made at Aberdeen on the 16/11/1981 till the 17/11/1981. The ship went to retrieve marker buoys in the area near the Sutors of Cromarty on the 19/11/1981. The ship landed a crew member by pilot boat in Aberdeen on the 21/11/1981
Roger S Bailey (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)
North Sea Irish Sea and St. George's Channel
Central North Sea, Hartlepool, Firth of Forth, Dogger Bank, Northmberland coast, Bell Rock area, Lunan Bay, Montrose area, Cruden Bay, Moray Firth
Biology and fisheries
Quantity: number of hauls = 39 Description: made with the International Young Gadoid Pelagic Trawl. Identification,distribution,biomass determination. Sprats, herring and commercial species