Some salmon make one heck of a commute. The record holder in the Pacific Northwest, for example, is a steelhead that was tagged in the Clearwater River, Idaho, in April 2003. A year and a half later, it was caught off the southern Kuril Islands near Japan. The most direct route between those two points -- as the crow flies, as they say -- is 4,200 miles. Imagine fish that make it that far then turn around and travel back to their home streams in order to spawn.