Giant goldfish are taking over Canada's ecosystem

    Canadian scientists Nick Mandrak from the University of Toronto came to the conclusion that about 20,000 goldfish live in ponds outside Ontario.  In the extreme conditions of the ponds in this area, Goldfish, which were domesticated in Asia, thrive and grow up to 30 cm, crowding out other species.

 Despite the fact that these fish have been domesticated, they still remain a representative of the exuberant fauna of Asia.  Goldfish have the ability to release dew hormones into the environment that affect everyone.  This mechanism depends on the amount of resources available to them in a particular reservoir.  As a result, the fish become incredibly large and begin to crowd out other species.

 All this is also facilitated by several distinctive features of this species:

 1. They are well adapted to hypoxia (low oxygen consumption, which is low in Canadian waters)

 2. They multiply quickly

 3. Goldfish coexist and promote the reproduction of blue-green algae - cyanobacteria that cause water blooms and release dangerous toxins.

 4. This species eats a lot and raises silt from the bottom while searching for food.

 The combination of all these factors worries many scientists in Canada, especially many biologists, who fear a particularly unfortunate outcome in which the American Great Lakes could occupy the Goldfish.