Aquarium Owners
Water gardeners, pond and aquarium owners have a number of responsibilities, including:
taking good care of the species that they keep
ensuring their artificial water environment stays isolated from the outside environment
when necessary, disposing of the fish or plants from that environment in a safe and humane manner
Do not dispose of plants and fish from aquariums and ponds into an Alberta stream, lake or river system. Releasing them disrupts the natural balance of Albertaís ecosystems, and ultimately results in biodiversity loss.
For example, koi and goldfish released from ponds and aquariums can survive Albertaís climate and grow to be very large. They have no natural predators in Alberta and will out-compete native species for resources.
It is illegal to release live fish into Albertaís lakes or rivers. Fines can be up to $100,000.
If you are no longer able to care for a fish from your pond or aquarium, do not release it into a lake or river. Try:
Contacting the retailer for advice, or for a possible return
Giving it to another aquarium or pond owner
Donating it to a local aquarium society or school
Talking to a veterinarian about humane disposal
Goldfish leave the bowl, get huge
01:00 - Source: CNN
CNN  — 

We’re gonna need a bigger boat.

Officials in Alberta, Canada, say dumping of live goldfish into the ecosystem has resulted in freakishly large fish. The invasive species has no natural predator and is thriving in poor water conditions, according to Kate Wilson, aquatic invasive species specialist with Alberta Environment and Parks.

“The biggest one we’ve caught is the size of a dinner plate,” Wilson said.

“That’s the crazy thing about domestic aquatic pets, you have them in your aquarium and they are this cute little thing and then you release it into the wild and that constraint of size and food is gone and because of that some of these species can get really big,” Wilson said.

The fish are reproducing in cold, harsh, low-oxygenated areas like Fort McMurray, which is 275 miles north of Edmonton in Alberta. That is where they caught the four generations of fish pictured above.

Officials in Alberta, Canada, say dumping of live goldfish into the ecosystem has resulted in freakishly large fish.

Wilson warns, “We are estimating hundreds of thousands are in flowing rivers and water. My biggest concern is people are doing this because they think it’s the humanitarian thing to do. We really need to correct misinformation.”

It is illegal to dump or transfer live fish from one body of water to another. Aquarium owners who no longer want their finned friends have a few options: Contact a retailer for a possible return, give the fish away, donate it to a school or talk to a veterinarian about humane disposal.