Herd of goldfish is as big as a disc, which is dangerous to the city of Canada

The goldfish grow to an unusually large, disc-sized size that rapidly and uncontrollably threatens the ecology of a lake in St Albert in Canada.

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From a pair of goldfish that were accidentally or deliberately released into employers by Edgewater a public pond in St Albert, they quickly developed into populations of up to thousands, up to 30cm length.

The size of invasive goldfish is growing.(Photo: IFL Science.)

Goldfish are considered as invasive species, because they compete for food sources with native animals in the area. Wildlife regulators worry that they can extend their living environment to other river and lake systems, where vulnerable fish species exist. At that time, native species are at risk of being unable to live there, leading to a reduction in biodiversity and natural ecosystems that will be permanently affected.

The city of St Albert in Canada used all measures but still could not destroy the goldfish.

In 2015, the city government decided to remove the water to ensure the lake was frozen completely to destroy the goldfish. But when spring comes, the water in the lake melts and the goldfish still survive.

In 2016, they used electric shocking to kill fish but still did not work.

Recently, the city government sprayed a special chemical to kill goldfish.