F.Heinoke was the first who intensively examined samples from that herring fishery. He deeided the herring were identical with those spawning at the Jutland bank. Later, K.A~i\ndersson investigated the herring in the Kattegat and in the eastern Skagerak o The only tribe found abundantly in the winter in that area is identical to wh..a.t Andersson called the tlFladen ll herring.. Andersson believed the Fladen herring were responsible for the great herring fisheries at Bohuslan o He started his investigations several years after the last Swedish period had ended in 1896. Since then there has been no great herring fishery inside the skerries of Bohuslan.