Just like large salmon under a herring ball Large Rainbow trout will do the same . When ever we see a lot of small fish rising in a concentrated area on Okanagan lake we deep troll bucktails thru them. It works a surprising amount of times. I have cotten trout in excess of 15lbs doing that.

Another good tip, when you get that large fish on and are bringing it near the boat or the shore, have your fishing partner make a cast just to the side of where your fish is taking care not to tangle with your line. This works an amazing percentage of the time. Big Fish follow fish that are hooked.