aquarium.mn The Minnesota Aquarium Society (MAS) is an incorporated, non-profit organization of tropical fish enthusiasts that was established in the 1931. From beginner to advanced hobbyists, store owners and breeders, there are roughly 200 current members - making it one of the largest societies in the country. Nonmembers are welcome to attend MAS meetings. MAS is a member of: Federation American Aquarium Societies General membership meetings are held on the first Thursday of every month at: King of Kings Lutheran Church; 2330 Dale Street North; Roseville, MN 55113-4599; (Just north of the intersection of Hwy 36 and Dale Street) We encourage members and visitors to arrive between 6:50pm and 7:00pm to network and socialize. We call the meeting to order at 7:15pm.