A preliminary note on the sole in the Dutch coastal area

Data on several fish species have been obtained from the fishing experiments which are carried out for the Dutch plaice investlgations. For these investigations routine trawling is done at 20 stations, situated along three lines, from Soheveningen westward from IJmuiden westward and from den Helder west-northwestward,all up to 3 o E. As far as weather permits these "lines" are fished four times a year, in January, April, July and October. All hauls last one hour and are made with an especially devised small-meshed light ottertrawl,with 4 1/2 om meshes in the cod-end.