I have caught a half dozen fish in the last couple of days by smacking the fly hard on the water right where the fish are lying in pocket water . They charge up from the bottom and smack the fly hard. I know Kelley Galloup advocates this tactic for streamer fishing to provoke a strike but I do not recall hearing or reading this for euro-nymphing. I was wondering if the strikes I was getting were from hatchery fish that have been conditioned to react to pellets hitting the water . I have listened to presentations by competitive fishermen who talk about making the fly bite, which I interpreted as striking the water hard so it would sink faster. Could anyone clear this up for me. I am in my first year of euro-nymphing so a lot of things are new to me.