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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.


Saturday, October 29, 2016    
CAS Fall Auction! - New Location -
4500 E Hampden Ave
Cherry Hills Village, CO 80113

CAS Sponsor - Visit all our Sponsors Here!

Platinum Sponsor2000 Web Design     (Colorado Local)
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Next General Meeting:

Tenative Event
Friday, November 4, 2016    7:30pm
November General Meeting

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

Event Open to Anyone

Friday, November 4th, 2016 @ 7:30 at the Bethany Lutheran Church, 4500 E. Hampden Ave, Cherry Hills Village, CO 80113 

If you enjoy the aquarium hobby, want to learn more about your fish and you want to have access to new species and new varieties, join us once a month for a very fishy experience. 

Non-members, visitors and guests are always welcome. No cost to attend. Come fish with us!

         Presentation:  TBA.

         We will have a mini-auction of fish, plants and other fish related items.

Become a Colorado Aquarium Society member for only $16 per year for the whole family. Visit us and see what you have been missing.   


Promptness Award: Make sure that you are at the general meeting by 7:30 for your chance to win the Promptness Award.

Bowl Show

Competition Date: 11/4/2016

Each Bowl Show has two pre-determined classes and one open class.

Remember:  Only Flat Sided Containers will be accepted.

For More Information on Bowl Show Rules, Click Here

  • Catfish. Shown as singles, smaller species better shown as pairs.† (Excludes Catfish that have their own class.)
  • Anabantoids, Gouramis, Paradise Fish, Climbing Perch, and Bettas other than male Betta Splendens. Shown in pairs, except for female Betta splendens. Use dividers if needed.
  • Open Class.

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):
Donation Amount:

Random Tip #28 - Sponsors
Remember to let the local stores know you are with the Colorado Aquarium Society everytime you shop. It lets them know we are supporting their store and encourages them to support our auctions and events.       - C. Fells, VP 2009
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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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