A fishy bear is mostly a myth, I have personally harvested three bears (1 brown and 2 black) on fish streams in Alaska and all had great meat. I only saved the backstraps from the brown (typical ignorance says any brown is inedible, especially a fish bear but wanted to try eating it anyway) and after frying some I wish I had saved all the meat.
To be honest I am fairly particular about my game meat and have had plenty of bad (gamey, rut stink) deer or mountain goat but never had problems with bear.