Smith D-Contact 50S Chartreuse Back Yamame
Most small trout do not become large trout. Most get eaten by large trout! The most noticeable feature of small trout, whether brown, brooks or rainbows, is their prominent parr marks. The Japanese Yamame also have prominent parr marks.
The Smith D-Contact 50S Yamame has prominent parr marks and looks a lot like a trout fingerling. The chartreuse back makes it just a bit more visible (to the fisherman as well as the fish).
The lure isn't cheap, but I am confident that it will prove to be very effective.