. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 848 Marine mammals would affect her fisheries adversely. In 1941 Japan abrogated the existing fur seal treaty. From 1942 until the signing of the current convention in 1957, the Pribilof Islands herd was protected by a provisional agreement between Canada and the United States. No pelagic sealing took place in the central and eastern North Pacific Ocean during this period, although a few thousand seals were taken annually by the Japanese in the western North Paci
. The Eastern Bering Sea Shelf : oceanography and resources / edited by Donald W. Hood and John A. Calder. Oceanography Bering 848 Marine mammals would affect her fisheries adversely. In 1941 Japan abrogated the existing fur seal treaty. From 1942 until the signing of the current convention in 1957, the Pribilof Islands herd was protected by a provisional agreement between Canada and the United States. No pelagic sealing took place in the central and eastern North Pacific Ocean during this period, although a few thousand seals were taken annually by the Japanese in the western North Pacific Ocean. In the middle 1950's, representatives from Canada, Japan, the Soviet Union, and the United States met to negotiate a new fur seal agreement, which resulted in the Interim Convention on Conservation of North Pacific Fur Seals, signed in February 1957. This agreement requires that northern fur seal populations be brought to and maintained at the level which will provide the greatest harvest year after year, with due regard for the relationship of the fur seal popula- tions to other living marine resources. The agreement emphasizes the interaction of fur seals with other living marine resources and orders the establishment of an effective marine research program. As a result, information on the biology and distribution of northern fur seals basic to an understanding of the Bering Sea ecosystem has been collected. During discussions leading to the signing of the agreement, scientists from the four nations decided that the Pribilof Islands fur seal population had increased beyond the level of maximum sustainable yield. The reasons for this conclusion were that the trend of increasing numbers of fur seals in the harvest did not persist after the mid-1940's (Fig. 52-1), the numbers of fur seals in the harvest varied consider- ably, and pup mortality was high. To achieve the 100 - 90 - 80 - I 70 - I 60 - I 50 - ji -S 40 - S 30 - 20 - 10 -. 1920 25 30 35 40 45 50 55 60 65 70
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