Invasive goldfish schools, some as large as dinner plates, are causing problems in Alberta. The provincial government is warning about the significant threat these goldfish pose to native ecosystems when introduced into Alberta’s water bodies. Environment Minister Grant Hunter emphasized that goldfish should remain in aquariums and not be released into Alberta’s waters.
Over 100 locations in Alberta have reported goldfish sightings, with new locations added annually, according to aquatic invasive species specialist Nicole Kimmel. Contrary to popular belief, goldfish are intentionally dumped into waterways, where they thrive, overwinter, and reproduce.
The “Don’t Let It Loose” campaign by the province aims to prevent the illegal release of species into water bodies, with penalties of up to $100,000 and/or a year in prison. Kimmel advises against releasing any species into water bodies, as this practice can introduce snails, fish disease, and plant fragments that may harm Alberta’s water ecosystems.
Goldfish present a significant risk to native aquatic ecosystems due to their adaptability and voracious appetite. They can survive harsh winters in Alberta and reproduce rapidly, with a single goldfish capable of producing around 40,000 offspring in just three years. Goldfish’s ability to outcompete native species makes them a serious threat to Alberta’s water bodies.
University of Toronto biology professor Nicholas Mandrak highlights that goldfish are global invaders known for their resilience in extreme environments. Storm-water management ponds, common near residential areas, provide ideal breeding grounds for goldfish due to warmer temperatures, leading to rapid reproduction rates.
Efforts are underway to control the spread of goldfish from storm-water ponds into the wild, with the Alberta government monitoring goldfish populations closely. Once goldfish establish themselves, culling becomes necessary through chemical treatments or draining the affected water body. Failure to address the illegal introduction of goldfish could lead to nationwide repercussions, adversely impacting native species.
Albertans are encouraged to report goldfish sightings and other invasive fish to the Aquatic Invasive Species Hotline and report any suspected intentional releases to the Report A Poacher hotline. By taking proactive measures, the province aims to protect its native aquatic ecosystems from the detrimental effects of invasive goldfish.