I just ran across this on FWP's site. A $2 Aquatic Invasive Species Pass is now required for all anglers. If you bought your license before May 19th it wasn't included but is required. Thought I would pass this on in case anyone missed it. Don't want anyone getting a fine since they couldn't have this in place in time for the 2017 license year. As they point out on their site "To be very clear: The new AIS prevention pass will be required for all anglers, including those who have purchased a license prior to May 19". Check FWP's site for more info.

Here's the link from FWP (it's buried, and took me five minutes to find). I think you should be able to purchase this online.

http://fwp.mt.gov/news/newsReleases/ais/nr_0019.html