2 of 7 Unloved domestic goldfish are considered one of the world's worst invasive aquatic species because of their negative environmental impact in 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. The State of Washington will soon have to rehab a lake that is overrun with an invasive species: Goldfish. Pet Goldfish Become Invasive, Soda Bottle-Sized Menaces When Released into the Wild In the wild, goldfish can grow to be the size of footballs and wreak havoc on the ecosystem 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 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.. The fish have filled West Medical Lake, along with Koi, … 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. This, obviously, exacerbates the problem of goldfish being introduced into the wild. They tend to start bullying or attacking other fish that show signs of weakness. Goldfish were originally introduced from Asia through the ornamental trade and have been selectively bred to produce the bright orange colouration. The almost 90,000 pounds of goldfish caught in Michigan in 2015 brought in nearly $70,000 in revenue. Invasive aquatic species such as goldfish disrupt the balance of natural communities, deplete native resources, and may have a negative effect on water quality. Goldfish were first selectively bred in China 2,000 years ago for food. Larimer writes: Like other species of carp, the domestic goldfish … Caulerpa is listed as an invasive species by the US Plant Protection Act. 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