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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.


Our June 5th speaker will be Gary Lange, the recognized authority on Rainbow fish. Extraordinary NEW Rainbowfish of Papua (Irianjaya)

CAS Sponsor - Visit all our Sponsors Here!


Next General Meeting:

Confirmed Event
Friday, June 5, 2015    7:30pm
June General Meeting

First Universalist Church of Denver
4101 E Hampden Ave
Denver, CO 80222

Event Open to Anyone


         Our speaker will be Gary Lange, the recognized authority on Rainbow fish. Extraordinary NEW Rainbowfish of Papua (Irianjaya) . Gary will speak about his adventures discovering 9 to 10 brand new rainbow fish species from this region; including the most exciting rainbowfish discovery the hobby has seen since the "Neon Rainbowfish"; the "Wapoga Red Lazer". This fish was just recently named "melanotaenia rubrivittata". Gary will share with you the punishment dished out by Mother Nature, how they were able to find their way back through the jungle after being abandoned by their boat captain, trecking hours through the bugs and the mud, and how it was worth every bit of it for these amazing fish! Gary will also bring egg kits with instructions for hatching and care to the auction after his talk. This way you can easily and safely raise these awesome fish in the safety of your own home and enjoy them for many years to come.

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

         Our Bowl Show categories for June will be: Characins and Tetras, Neons,, Serpaes, Black Tetra, Flame Tetra, Piranha, Silver Dollars, Anostomus, Leporinus, Metynnis, Headstanders, etc.  Hatchets, Headstanders and Pencil Fish are included in this class.  Shown in pairs with divider if necessary.   Barbs, al species of genera barbus, Barbodes, Capoeta and Puntius.  Shown in pairs or twos.   

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

Kelly Dawson Education Fund

Learn more here.

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It takes $50 for tank with fish to be maintained for a school year, however, any donation amount is appreciated.
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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 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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