I think the nature of these predators is to fill a niche and NOT wipe out their food source: If otters eat more, there will be less for pikeminnows, stripers, and osprey to eat. Also the otters will eat all kinds of fish, including some of those pikeminnows, and maybe small stripers (both of which eat trout and salmon).
I've seen otters on the Yuba and Feather (in the 70's and 80's near the confluence), the Trinity, the Tuolumne (upper and Lower), the Rogue, and the upper Sacramento. Maybe other places I can't remember, too. I don't like to fish near them, but I love to see them and I generally think they are a sign of a healthy system.
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