1) To take part in the International Young Herring and Gadoid Pre-recruit Survey in the North Sea.
2) To determine the age composition of cod, haddock, saithe, and whiting for each block of squares
3) To undertake, on completion of the International Survey, two trauls per statistical square in the blocks numbered 1-3
''Explorer'' anchored in the Wick of Gruting on 20/02/1980 and remained till the 22/02/1980 due to bad weather . A mid cruise break took place on the 25/02/1980 and set sail the following day. ''Explorer'' also anchored in Leven Wick on the 29/02/1980 till the 03/03/1980 due to bad weather. 11 Stations were completed and a further 4 on the east coast of Shetland. 7 trawls were made in the Orkney and Moray Firth areas. A total of 57 valid hauls were made during both parts of the cruise using the GOV trawl and 2912 otoliths taken from cod, haddock, and whiting were read at sea. Material was collected for use in multispecies models. Maturities of haddock and whiting to determine the age at first spawning were recorded at stations north of 59 degrees, 30 minutes. Invertrbrates were taken in very small numbers throughout most of the cruise. Samples of haddock from the Orkney and Shetland areas were deep frozen for Dr McVicar.
Arthur S Jermyn (Department of Agriculture and Fisheries for Scotland Aberdeen Marine Laboratory)