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Welcome to the Colorado Aquarium Society's Home Page

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.
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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.

Random Tip #43 - Website
Did you know... You can view pictures of past competition winners and participants by selecting View Past Competitions under the Competitions Listing.       - Webmaster
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The Colorado Aquarium Society will have a picnic instead of a meeting for July. Our meeting date would normally be on the first Friday, which is the 4th, so a picnic is called for.  It will be on July 12, from 1 to 4 in Brighton.

CAS Sponsor - Visit all our Sponsors Here!

Platinum Sponsor
Platinum Sponsor
Zoo Med
    Zoo Med Laboratories, Inc.,    3650 Sacramento Dr.,    San Luis Obispo  CA  93401     1-888-496-6633     FAX 1-805-542-9295
Zoo Med manufactures and distributes products for, and maintains information on their website for, the care and keeping of reptiles, amphibians, fish, and birds....

Next General Meeting:

Tenative Event
Friday, August 1, 2014    7:30pm
August General Meeting

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

Event Open to Anyone

 7:30 p.m. To 9:00


Program:   TBA 

First Universalist Church:
4101 East Hampden Ave., Denver CO 80222
The church is located on the north east corner of Colorado and East Hampden, next to Magna Carta park. There are several churches in the neighborhood, ours is white and has a steeple in the front, with a distinctive round building to the north.
From I-25 and Exit 201 (Hampden Ave.) head west, toward the mountains. Drive 1.2 miles on Hampden Ave., the church is on the right.
From the west (Broadway, Santa Fe or University), go east on Hampden Ave. Turn left on Ash, which is one block east of Colorado. The parking lot is on the left.

If taking public transportation, take Bus 40 South on Colorado, or Bus 35 on Hampden

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

Bowl Show
August (Includes July Classes)

Competition Date: 8/1/2014

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

  • Marine Fish. Species that are exclusively marine.
  • Large Neotropical Cichlids. Shown in pairs. Except for the very large fish.
  • Open Class. (Includes July Open Class)

Bowl Show
July (Classes moved to August)

Competition Date: 8/1/2014

Because of our July picnic, we will move the July Bowl Show Categories to August. 

  • Livebearers. Shown in pairs.
  • Goldfish and Koi. Shown in singles.
  • Open Class.

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

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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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