missouri's aquatic hobby and conservation organization
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!
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
JUL 16 - Mantis Shrimp
W/ Calder Burton
Calder Burton, of the Watercolors Podcast, will visit MASI in July to talk about breeding the mantis shrimp, a fascinating and famously hard-hitting marine invertebrates.
Bowl Show
Coolest Pond
Send us a video of your coolest tub pond, or regular pond for a chance to win a prize.
Mail to: bowlshow@missouriaquariumsociety.com
Next Special Event
Fall Swap
Our Swaps are Held at Jost Chemical!
Located at 8150 Lackland Rd.
Sep 12, 2026
All MASI Events Hosted @ Jost Chemical Company
Meetings are held on the 3rd Thursday, staring @ 7:30
Entry is Free!
All Ages Welcome!
Swaps start at 11:00 A.M. and go until 2:00
Refreshments will be sold!
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!