Goldfish Released into Lake, Becomes a Giant!


Goldfish in some countries are considered a nuisance pest. This includes Canada where authorities have warned people not to release their pet goldfish into the wild, for example into lakes.

Recently, authorities in Ontario caught a jumbo-sized goldfish from Hamilton Bay. This is part of research in an effort to control goldfish populations in the wild.

"Ever wondered what happens to pet goldfish if they are in our waters?" wrote Fisheries and Oceans Canada, while showing the giant goldfish they caught on Twitter, as seen Thursday (16/12/2021).

"This is why it is important to never release them into the wild," the agency added. Goldfish become very large because open water is an ideal habitat for them to eat and breed.

Previously in the City of Lethbridge, Alberta, Canada, officials were worried about the increasing population of goldfish and koi in several of the region's lakes. Apparently a lot of people let their pet fish go there and cause problems.

This goldfish is able to survive in cold weather and has no natural enemies. So they can easily overtake the local fish population and disturb their habitat.

"This large population is caused by someone releasing these fish into the lake. They are not local fish, people put them there on purpose and created this very big problem," he continued.

Residents were also asked not to throw it carelessly and the authorities would try to suppress the fish population. In addition to disturbing local fish, goldfish can contribute to water quality degradation by ruffling sediments and uprooting plants.

On the one hand, goldfish are indeed attractive as pets, but are considered bad for the environment if released.

"All goldfish are basically invasive species all over the world. Across North America, Australia, parts of Europe, they're really widespread," said Przemek Bajer, an academic at the University of Minnesota.

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