At least once per year, the Water Resources Management Team must spend time and funding resources to remove a population of an aquatic invasive species that someone has released. The fish have filled West Medical Lake, along with Koi, … The goldfish (Carassius auratus) is a freshwater fish in the family Cyprinidae of order Cypriniformes.It is commonly kept as a pet in indoor aquariums, and is one of the most popular aquarium fish.. Commercial fishermen on the Great Lakes have started making a profit from the invasive species. Hundreds of goldfish are swarming Pinecrest Lake in B.C., with some now as large as 13 centimetres, according to the Sea to Sky Invasive Species Council. The Alberta government has just issued a plea asking goldfish owners not to release their discarded pets into the wild. Goldfish were first selectively bred in China 2,000 years ago for food. This, obviously, exacerbates the problem of goldfish being introduced into the wild. The species is so prevalent in the warm, shallow waters of western Lake Erie that it's now a commercial catch with over 113,800 pounds of goldfish netted in 2015. Caulerpa is listed as an invasive species by the US Plant Protection Act. Unloved domestic goldfish are considered one of the world's worst invasive aquatic species because of their negative environmental impact in the wild… According to Pure Goldfish, goldfish are among the more aggressive species of pet fish. The State of Washington will soon have to rehab a lake that is overrun with an invasive species: Goldfish. They tend to start bullying or attacking other fish that show signs of weakness. Under the surface of Big Woods Lake in Chaska, crews were at it again Monday after netting a truckload of wild goldfish from the water last week. Goldfish were originally introduced from Asia through the ornamental trade and have been selectively bred to produce the bright orange colouration. 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