Russ and i have been discussing worms in fish, he asked what causes this? says he caught some in erie with worms, ive always thought it was a small lake problem, i found a pond a few years back that had monster gills, u couldnt catch one under 10'', i brought 8 home for a meal and when i stuck my filet knife in they were so infested worms were wiggling, does any one know what causes this?