Canada has a big problem with supersized goldfish, which have grown within the abundant environments of the country's waterways.
and might seem like harmless fish, but they can wreak havoc on the natural world if they’re released in the wrong places. While they remain small in the tanks we use to house them in captivity, goldfish are actually known as “intermediate growers”. That means they continue to grow throughout their entire lifetime. And, if the conditions are right, they can grow to be massive bulging creatures.
This is a problem because people often dump goldfish into the wild in waterways and environments that typically house other species of fish. That’s what has happened in Canada, Fisheries and Oceans Canada says. The goldfish, which have access to an abundant source of food, have started to take over key spawning sites for fish like Northern Pike.
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