Contact the Wisconsin Aquaculture Association:
Wisconsin Aquaculture I am sure some of these nwebies
could point you in the right direction.
Jim Held and Ron Johnson are your Extension Aquaculture Outreach Specialist's, depending on farm location.
You should really consider joining the WAA if you are a fish farmer, or planning on becoming a fish farmer.
Like Rex said, Aquaculture has been around for a very, very, very long time in Wisconsin.