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!

a pair of fish swimming in water
a pair of fish swimming in water

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

OCTOBER 16 -

TALKING TANKS

Scientific Language
w/ Micah Issitt

Darter Editor Micah Issitt will give us a presentation on how to understand and use scientific nomenclature when discussing fish and plants.

Bowl Show

Cutest Fry

Send us your cutest, most adorable videos of your baby fish, it's time for the inagural "Cutest Fry" competition. Winner will receive a prize! Videos max length 20 seconds.
Mail to: bowlshow@missouriaquariumsociety.com

Next Special Event

Fall Auction

Saturday, Nov 8, 2025

Thousands of fish. Plants. Tanks. Miscellaneous Supplies. What could this mean? Time for the MASI Auction. Bring your friends, and your wallet, and get ready to have fun and bid big.

Questions?
auction@missouriaquariumsociety.com

a bunch of fish in plastic bags hanging on a wall
a bunch of fish in plastic bags hanging on a wall

Doors open @ 11

All Events Hosted at Jost Chemical Company

red Siamese fighting fish
red Siamese fighting fish

Contact Us Today

Reach out to Missouri Aquarium Society for inquiries about aquariums, fish, and our conservation efforts. We look forward to connecting with you!

Inquire