The Alaskan rivers that Salmon swim up to spawn simply offer excellent, shallow and sheltered locations for them to lay their eggs. It’s a good habitat for them, and they’ve been using those rivers for generations. Alaska is remote, so it has avoided much of the pollution and damming which has destroyed the spawning grounds salmon used to use in other areas. Salmon used to be much more common in rivers all around the U.S., but their spawning grounds have been damaged or destroyed in man other locations. Thus, Alaska is home to some of the more impressive remaining salmon runs.
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