In Alberta, schools of invasive goldfish, some as large as dinner plates, are causing a major issue. The provincial government is raising concerns about the significant threats to native ecosystems resulting from the presence of goldfish in various water bodies in the province. Provincial Environment Minister Grant Hunter emphasized the need to keep goldfish in aquariums and not release them into Alberta’s waters.
More than 100 locations in Alberta have reported sightings of goldfish, with new locations being added annually, according to the province’s aquatic invasive species specialist, Nicole Kimmel. Contrary to popular belief, goldfish are not ending up in waterways by accident but are deliberately being introduced into them, where they are thriving and reproducing.
The “Don’t Let It Loose” campaign by the province aims to prevent the illegal release of species into waterways, which can lead to fines of up to $100,000 and/or a year in prison. Kimmel warns against releasing any species into water bodies, as it can introduce snails, fish diseases, and plant fragments that may disrupt the balance of Alberta’s water ecosystems.
Goldfish pose significant risks to native aquatic ecosystems due to their adaptability and voracious appetite, unlike many native fish species that have specific dietary and reproductive preferences. These invaders can survive harsh winters in Alberta and reproduce rapidly, with a single goldfish capable of producing 40,000 offspring in just three years.
The issue of invasive goldfish extends beyond Alberta, as they are considered global invaders. University of Toronto biology professor Nicholas Mandrak, an expert in invasive species, highlights the resilience of goldfish in extreme environments, making them a widespread problem not only in Canada but globally.
Mandrak’s research in Ontario focuses on controlling the spread of goldfish from storm-water management ponds into the wild. These ponds provide ideal conditions for goldfish to breed, as they are warm and close to residential areas, making them convenient dumping grounds for unwanted fish.
Efforts to manage goldfish populations in Alberta may involve chemical treatments or draining bodies of water once they have been established. Failure to prevent the illegal introduction of goldfish could lead to nationwide repercussions, impacting native species across the country. Reporting sightings of goldfish and other invasive fish to the Aquatic Invasive Species Hotline is encouraged, along with reporting any suspected intentional releases to the Report A Poacher hotline.