coho hate stuff that wants to eat their children. Try egg sucking leeches, but use a Trout Bead as the egg threaded ahead of a regular BIG black or purple woolly bugger.....it looks more realistic than a chennile "egg" and it helps the fly sink. Another trick is a mouse brown or dark olive mottled barbell eyed bunny leech, stripped, zigged, zagged, pulled, darted, dropped etc through a run. Make it look like a living critter. If they hit it they crush it....nothing subtle. Even anorexic silvers will whack these at times. Cherry bomb bucks DETEST anything trying to eat their kids, but those are for entertainment only and must be released......no smokehouse !!