missouri's aquatic hobby and conservation organization

The sun shines through the water in the ocean

Join us in preserving aquatic ecosystems and enhancing your aquarium hobby experience.

Welcome to

The Missouri Aquarium Society Inc, (MASI) is a nonprofit hobbyist organization focused on aquariums and aquaculture. We welcome anyone with an interest in aquatic life to come to our meetings or events as our guest. We would love to meet you. Our members include beginners and experts, children and adults, casual hobbyists and professional aquascapers, and all are welcome here!

Join or Renew

the Missouri Aquarium Society

Membership in MASI helps us bring expert speakers for our speaker series and streamed YouTube programming, funds Darter Magazine, one of the best aquarium magazines in the nation, and supports our efforts in the community and to support aquatic conservation around the world.

Coming up Next from MASI

Next General Meeting

MAY 21 - Fishy Bucks Auction

Awards and Fishy Bucks

We are once again hosting our member's only fishy bucks event, where work done for the club (including meeting attendance) has earned you points, which become "bucks," which can be used to bid on fish.

Bowl Show

NO BOWL SHOW IN MAY

There is no bowl show in May, as we save all the time we have for our member's only meeting, where awards will be given out.
Mail to: bowlshow@missouriaquariumsociety.com

Next Special Event

Spring Swap

Saturday, May 9, 2026

Thousands of fish. Plants. Tanks. Miscellaneous Supplies. What could this mean? Time for the MASI Swap. Bring your friends, and your wallet, and get ready to find your next fish, plant, invertebrate, or maybe a lifelong friend.

Want to sell? Questions?
swap@missouriaquariumsociety.com