In Montana you should talk to Steve at A.R.T. I am not sure what he offers but he should be able to steer you in the right direction. If you are looking outside Montana The Academy of Wildlife Art in Duncansville, Pa offers fish only instruction. You can look check the website
www.discovertaxidermy.com These are 2 of the 4 fish that I did as demo's. Each student completes a wall mount bass and rainbow as well as a commercial replica. They also mold and cast a bluegill replica and finish it two sided. As was previously posted there are numerous individuals and schools that offer fish only training. They are listed under learning taxidermy.

