Sprinting Salmon Face Tragic Deaths

Researchers have found that burst swimming or "sprinting" among salmon can lead to the fish having heart attacks mere feet from their spawning grounds, journeying so very far only to tragically die near the very end.

Traditionally, when fish like the sockeye salmon encounter fast and turbulent water - such as parts of river just downstream of a dam - they launch into a swimming "sprint," fighting the rapids and trying to get to calmer water as fast as possible.

This makes for some fantastic imagery, with the determined fish valiantly climbing their way up a seemingly impassible obstacle. It is also the same behavior that allow fish ladders - man-made steps that lead fish .... http://www.natureworldnews.com/articles/8644/20140820/sprinting-salmon-face-tragic-deaths.htm