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The Colorado Aquarium Society, established in 1947,  is an open group for aquarists to share their interest in all facets of the aquarium hobby. Our members consist of advanced expert hobbyists as well as beginners and all levels between.  If you are interested in learning about the hobby, sharing your experience in the hobby, or would like to discuss any aspect of fish, invertebrates, plants, aquariums, ponds, and amphibians, The Colorado Aquarium Society General Meetings are open to the public and everyone is welcome!

The CAS was established in 1947 and incorporated under Colorado law as a non profit organization on November 6, 1962.

For a detailed review of our history go to our history page.


Due to a conflict with the church schedule, the May General Meeting will be on the 19th....  No meeting on May 5th.

NOTE:  Growth contest fish, Odessa barbs, and growth contest plants, Madagascar Lace Leafs, are due back in for judging.

CAS Sponsor - Visit all our Sponsors Here!

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Next General Meeting:

Tenative Event
Saturday, July 15, 2017    12:00pm
July General Meeting / Picnic Potluck!

Sorry, this location is only visible to members. Already a Member? Go to Member Area Event List

Event Open to Members and Their Guests

July picnic is scheduled for Saturday, July 15th, 2017.  Tentative location is (available to member's only) (Tory Brown's hide-a-way).   Food at 1:00.  RSVP requested so we can plan.   I suggest that you come up early, there are hiking trails, biking trails, horse trails, off-roading and scenic drives everywhere around the cabin.  Hike, come back to the cabin to eat, rest and go hike again.  Child and dog friendly, bring everyone.  Lots of entertainment for the younger set.   Elevation is about 8,800', it will be cool with lots of tall pines for shade.  Large deck for lounging and conversation.  If fire restrictions allow we will have a fire pit going for Samoas The drinking water is great! Only about 6 miles from Mt. Evans.  Nearby Public shooting range.   Only 1 hour drive from SouthEast Denver, mostly paved, last mile is good gravel road.  Make a day of it!  Fun in the Mountains!

Kelly Dawson Education Fund

Learn more here.

Sponsor a tank for a school!

It takes $50 for tank with fish to be maintained for a school year, however, any donation amount is appreciated.
Your Name (Optional):
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GENERAL MEETINGS: Everyone is Welcome!

First Friday of Each Month at 7:30pm

Bethany Lugheran Church
4500 E. Hampden Ave
Cherry Hills Village, CO 80113

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General Meetings are held on the first Friday of every month, and feature a cash promptness award, a detailed program on a specific aspect of the aquarium hobby, a bowl show, a mini-auction, and announcements of up-coming activities.

General meetings are open to the public. We welcome guests, so please feel free to attend if you are interested in aquariums and ornamental fishkeeping.

For more details on this month's meeting, see our Meetings And Events List


The CAS encourages its members to breed and show their fish through various programs such as Bowl Shows, Grow Competitions, Aquarist of the Year, and more.  Members who place in these competitions are awarded points that are accumulated towards a number of different awards.

Learn more about CAS Competitions, Bowl Shows, and Grow Contests.


Mini-Auctions are held at the end of each General Meeting and include fish, plants, supplies, and equipment. Please note that there is a 5 item per member limit on items to be auctioned at the Mini-Auction.

Mini Auction Information:

If you did not get your labels at the meeting, and would like to pre-print labels, you can print these.
Printable Labels - Normal Items
Printable Labels - Minimum Bid Items
If you would like to print these labels, you must attach them with packing tape that covers the label completely to protect it from getting wet. Also for Minimum Bid, if your printer doesn't print the pink for minimum bid, you will need to highlight in Pink / Red after printing.

For more information on Auctions, visit our Auction Information Page.


Board Meetings are held the last Friday of each month at a memberís residence.  They are the business meetings of the CAS and are open only to members.

Members are invited and encouraged to attend. Non-board members do not have voting rights but memberís input is recognized and appreciated. It is also a great way to see other memberís aquarium setups.


Throughout the year CAS hosts a variety of educational and fun activities for its members.  Annual events may include a fish show, auctions, a Summer picnic, and the Christmas Party / Annual Awards Banquet.

In addition, other special events are held and vary each year.  Past years events have included: field trips, collecting trips, workshops, making fish food, and home (fish room) tours.

View Coming Events List


CAS holds two auctions annually: a Spring Auction and a Fall Auction. The purpose of these auctions is to generate operating revenue. Auctions are open to the public and we invite everyone to attend. Items include: bagged fish, hardware such as tanks, heaters, filters, etc., and supplies such as food and water conditioner.
For more information on Auctions, visit our Auction Information Page.

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