Abstract
From 1955 to 1958 the tagging experiments were conducted on the king crab (Paralithodes camtschatica TIBELIUS) in the west coast areas of Kamchatka, and on analysing the data of recapture, the following results were obtained.
1) The number of recapture of the tagged crabs decreased from the year following release, until they were no more captured from the fourth year on. During 1955-1957, the every year's ratio of recaptured to liberated number was 15.9% in average.
2) The results of recaptured in the years of release suggest that during April and May the king crab in this area moves northward from offshore to the coast, that in June it begins to go southward along the coast until it has advanced in the south part of the areas in July-August, and that durins August and September it starts the movement toward offshore. The movement is slow at the beginning of fishing season (from April to October) and becomes more active as the stock goes southward.
3) In the year following release, the tagged crabs are widely scattered in the fishing ground regardless of the locality of release, and the rate of recapture at the beginning of fishing season is proportional to the catch.
4) From these results it may be possible to regard as one stock the king crab in the areas of west coast of Kamchatka.
