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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.


CAS Holiday Party and Awards

Saturday, December 6, 2014    

More information will be sent to member's soon.

CAS Sponsor - Visit all our Sponsors Here!

Platinum SponsorTodd’s Tropical Fish     (Colorado Local)
    10015 E. Hampden Ave.,    Denver  CO    303-338-1331

Next General Meeting:

Confirmed Event
Saturday, December 6, 2014    6:00pm
December General Meeting - Holiday Party and Awards

Cinzettis Restaurant

Event Open to Members and Their Guests

CAS Holiday Party and Awards


December Meeting: Holiday Party, Awards, and Gift Exchange

The Holiday Party is open to members and their guests.

Our Holiday Party for December will be held:

December 6, 2014      Time:  TBA
Cinzettis Restaurant


Reservations are required!
Reservation information will be sent to members soon.

Anyone who would like to participate in our ‘White Shark’ gift exchange should bring an un-wrapped fish related gift in a paper bag (preferably brown paper bag). These gifts are very fun and while there is not any limits on price range, they usually value between $5 and $20 and are in some way fish related, though they do not need to be aquarium supplies. The unlabeled and un-wrapped gifts are placed on a table and numbers are drawn to participate. When your number is called, you have the option to pick a new gift from the table or “steal” a gift from someone else. Once a gift has been held by the same person three times, they keep the gift and it can no longer be stolen. When all the gifts are taken from the table, each participating person will have a gift and the game is over. (It may sound complicated, but it is really easy when you see it in action, and is a really fun time.)

Also, CAS awards will be announced and given out during the party.

For More Information Contact CAS.

Bowl Show:
The Championship Bowl Show will be held in January.

DO NOT BRING FISH to the December Holiday Party.

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 #9 - Website
Our Member’s Area contains a list of our available books. Members can check-out these books at a meeting and return them at the next meeting. To search through the CAS Library, sign in to the member’s area and select ‘Library’ in the upper right.       - Webmaster
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GENERAL MEETINGS: Everyone is Welcome!

First Friday of Each Month at 7:30pm

First Universalist Church of Denver

4101 E Hampden Ave, Denver CO 80222

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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 member’s 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 member’s input is recognized and appreciated. It is also a great way to see other member’s 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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