Spring Auction 2020 cancelled till further notice.
CAS Auction Information

Spring & Fall Auctions:

Remember to visit our Business Supporters Page to view a full list of companies that donate for the auction and be sure to let those companies know you saw their link here!  Auctions are the club’s main source of revenue. CAS holds two auctions annually: one in the Spring and the other in the Fall. Auction dates and times are published on the web site home page, on Facebook, and posted in local aquarium shops. Auctions are open to the public and are a great opportunity to meet other fish enthusiasts and get great deals on new and used equipment, fish of all kinds and sizes, fish food, aquarium plants, and all sorts of accessories you might need.  NEW this year we have Youth Items just for our members under 18 yrs of age.  Our youth bidders need to register on the website below, just like the adults.  They will have purple bidder cards.  See auction rules for details below.  


At checkout, the sales revenue is split between the club and the seller in the following manner: The CAS receives the first $1 of every sale. The remainder is split between the CAS (20%) and the seller who receive 80%. All sellers must be members of CAS, which is free, just fill out the form on this website.  (Sellers may donate 100% to CAS if they want)  At the Spring and Fall Auction, the seller's split are calculated after the auction and checks will be available at the next general meeting and mailed to the seller after that.


The Mini-Auction: is where people can bring in aquarium related items to auction off during the monthly general meetings. The auction is held at the end of the meeting so that people can see and inspect the merchandise before bidding. There is a limit of 5 items per member and items to be auctioned must be registered with MyFishAuction.com before the meeting (See below). Seller split same as with the big auctions.  All sellers must be members of CAS, which is free, just fill out the form on this website.  100% donations in good condition are also accepted.  At Mini-Auctions, the seller split will be calculated at the end of the auction at checkout.  It is the sellers responsibility to pick up proceeds at the end of the meeting/auction. If seller is not going to stay then we ask that you notify the front desk before leaving and leave your address. If after two meetings the funds are not claimed they become a donation to the CAS.


If you wish to sell at our auctions, including the mini-auctions, please be sure to register and enter your items before the event using the website below. Sign up for live auction name “CAS September mini-auction” as an example. There are detailed instructions at the following link:


Seller forms are no longer necessary as long as you registered and entered your items in advance. If, after reading the link you still have problems you can contact Kevin Thurston at auctions@coloradoaquarium.org  or using the contact tab here on the website. 



Get Ready for the Auction!

Auction Rules: General / Seller / Bidder / QuickSale --- EVERYONE READ

Rules Updated Feb. 2019

Fish Selling Guidelines

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 - QuickSale Items

Printable Labels - Minimum Bid Items

If you would like to print these labels, you must attach them with clear packing tape that covers the label completely to protect it from getting wet. Also for Quicksale and Minimum Bid we are no longer using color codes on labels so just print in B/W.  


NOTE TO AUCTION SELLERS:  (PDF above - Fish Selling Guidelines)

CAS guidelines are very clear that no more than 5 bags of one species / color-morph may be sold by a member / person. We would like to clarify that this should be considered PER MEMBERSHIP / FAMILY. This means that even if you have 3 members in your family membership, it is not appropriate to bring 15 bags of a single species / color-morph. Too many of anything slow down the auction AND bring lower prices. If you have too many fish for one bag, please tape up to three bags together to form larger groups.


Additionally, the seller rules are also clear that dry goods, used equipment, common plants, and live foods, need to be labeled and placed for Quicksale. This means all duckweed, guppy grass, java moss, micro-worms, vinegar eels, gravel, used filters, dry fish food, hardscape, decorations, and most used tanks, etc. should be on the Quicksale table. Some exceptions to this are very good condition tanks that have stands, rare plants, or plants grown on rock or driftwood. When in doubt, please ask an auction staff member.  Please review our new updated auction rules! 


Please also review the “AUCTION FISH BAGGING GUIDE” below. Fish that are not bagged appropriately may be re-bagged without notice by auction staff at a cost of $1 per re-bagging.


Auction staff will be STRICTLY enforcing these rules to help speed up the flow and make the auction fun and successful for all sellers and buyers.


New Sellers: Please note that your auction proceeds will be made available by check at the next general meeting or if not picked up mailed to your listed address. Your funds will NOT be available at the auction for purchases.


AND REMEMBER: If any item of yours does not sell for any reason at the end of the auction and you are not there to pick it up, it will become the property of CAS and sold or disposed of as such.



NOTE: If you intend to bring fish to auction please follow these guidelines:

Stop feeding your fish 2 days before the auction. This prevents the bag water from becoming polluted with fish waste while the fish is at auction.

Avoid mixing males and females in the same bag if the species is aggressive and the fish are sexually mature. Instead, bag the males separately from other males and from the females. The females can usually be bagged as a group. Then, either tape the bags together or place together in a larger bag if they are to be auctioned as a group. Large fish bags can often be obtained from your local fish store.

Do not put too many fish in a bag. It is always better to use a larger bag or put fewer fish in a bag. Always.

Do not put too much water in the bag. Fish depend on oxygen dissolved in the water and need more air than water to survive. Fill the bag only 1/4 to 1/3 with clean tank water but use enough water to keep the fish submerged and in a normal upright position if the bag is laid on its side. Use a larger bag if these two conditions can not be met at the same time.

Double bag your fish with fish bags. NO ZIP-LOCK BAGS CONTAINING FISH WILL BE ACCEPTED. To double bag: First, bag the fish according to the above recommendations. Then, place the bag upside-down into another bag of the same size and seal it tight with a rubber band. This helps prevent punctures and keeps fish from getting trapped in the corners. Another method is to single bag the fish using the more expensive 3 mil thick fish bags. However, these bags can be difficult to seal tight because of the thicker plastic.

Use the proper size bag for the fish. Common sense applies here. Bags of different sizes are available at your local fish store for a nominal fee. We also have bags for sale at the auction: 10/$1.50. These are usually an 8 inch or 10 inch bag and may not be large enough for your needs.

Bag the fish the morning of the auction to ensure they have a clean, well oxygenated environment. If you have too many to bag in the morning use Jungle Labs ‘Bag Buddies’ and bag the fish the night before the auction. Jungle Labs ‘Bag Buddies’ are an inexpensive and really good solution to ensuring your fish not only survive the auction but look great and command a higher price. They are available at your local fish store.

Keep the fish as warm as you can, before auction and after, by using a styrofoam box or cooler. Styrofoam boxes are usually available at the auction for a nominal fee. Your local fish store may be able to supply you with one as well.


These guidelines are intended to help you provide your fish with the necessary environmental conditions to ensure healthy, vibrant animals are bought and sold at our auctions.


Following these guidelines ensures a win-win situation for both the seller and the buyer: The seller benefits as the bid price is generally higher for fish that appear healthy and active. The buyer benefits by knowing they are not wasting money on fish of questionable health.


If your fish are improperly bagged, they may be turned away, or you will be charged $1 for every re-bagging. REMEMBER, only 5 groups of the same fish/color morph can be sold per person. If you have several of the same fish/color, you can tape the bags together to sell them as a group.


We have made reference to your local fish store as a source of supplies and guidance in preparing your fish for auction. Please remember: they generously donate several hundreds of dollars in goods to our auctions on a regular basis. We encourage you to continue to support them by making purchases with them. The Colorado Aquarium Society hopes you have an enjoyable time at our auctions and that you are successful in purchasing/selling your aquarium related goods. We welcome any questions, suggestions, or comments you may have.

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