I caught a trout on a parks stream last week, and when I netted it, I saw that it was bleeding from one side of it's gills. I thought I had perhaps gill-hooked it, but my hook was clean in the jaw. After de-hooking and reviving it for a bit, the bleeding seemed to stop. I opened up the gill plate and saw a couple of beige colored parasites, about the size of a grain of rice each, attached to the outer fringes of it's gills. The gills looked pale, and a little ragged, otherwise, the fish was robust, and fought brutally!
In later days, I would find two dead rainbows with what looked like heavy growths of white fungus grown around the gill plates. I also found a badly struggling dolly with the same affliction, clearly on it's way out. My googling led me to a short piece on a similar affliction in a midwest watershed, but lacked in the substance I was hoping for. Anyone know what I seeing, and what it means for Alaskan trout?