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A NEW MODEL OF OCEAN MIGRATIONS OF BRISTOL BAY SOCKEYE SALMON

A NEW MODEL OF OCEAN MIGRATIONS OF BRISTOL BAY SOCKEYE SALMON,ROBERT R. FRENCH,RICHARD G. BAKKALA

A NEW MODEL OF OCEAN MIGRATIONS OF BRISTOL BAY SOCKEYE SALMON   (Citations: 5)
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A model is presented that describes the ocean migrations of Bristol Bay sockeye salmon from the time the fish leave the estuary until they return as adults. Bristol Bay sockeye salmon inhabit extensive areas of the ocean during various stages of their life at sea, ranging aCross most of the North Pacific Ocean from about long. 140'W to near long. 167'E and from near lat. 46'N to lat. 58°N in the central Bering Sea. Initially, their migration route takes the young juveniles from the eastern Bering Sea through the central and eastern Aleutian Islands passes to south of lat. 50'N where in late winter they become broadly distributed across the North Pacific Ocean. In June the immature fish start a northward movement and in summer occupy waters from lat. 50 0 N to the Aleutian Islands and over an east-west area from long. 160'W to 170'E; part of the population moves north into the Bering Sea. The following winter the sockeye separate into immature and maturing components. Those that will mature remain in waters north of lat. 50 0 N from whence they will migrate back to Bristol Bay in the spring with the major proportion entering the Bering Sea through passes east of long. 175'W. The immature fish that will remain at sea another year move south of lat. 50'N in the winter and early spring, then essentially repeat the migration they had made the previous summer. These fish as maturing fish the following winter and spring follow the same migration route as the earlier maturing group. No direct relationship was found between the distribution and migration of the sockeye and defined oceanographic features of the Subarctic Region of the North Pacific Ocean.
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