Dave, Thank you for your informative post.....I looked through the PP presentation and now I know what the disease actually looks like....I actually have seen and caught a few rainbows the past few months that looked similar to some of those in the photos.....If I continue to catch infected fish from time to time, what should I do w/ the fish. release it back in the river?...... I didn't know much about this as I now do.....Again, thanks for taking the time posting this....good job...