Invasive goldfish populations, some reaching the size of dinner plates, are causing significant concerns in Alberta. The provincial government is warning about the detrimental impact these introduced goldfish are having on native ecosystems in various water bodies throughout the province.
Environment Minister Grant Hunter emphasized the unsuitability of goldfish in Alberta’s waters, urging people not to release them. Over 100 locations in Alberta have reported goldfish sightings, with new locations being identified annually, according to aquatic invasive species specialist Nicole Kimmel.
Contrary to popular belief, goldfish are not accidentally entering waterways through toilets but are deliberately being released into the wild, where they thrive and reproduce. The “Don’t Let It Loose” campaign by the province aims to deter the illegal dumping of species into water bodies, with fines reaching up to $100,000 and potential imprisonment.
Goldfish pose a significant threat to native aquatic ecosystems due to their adaptability and voracious appetite, unlike many native fish species that are more selective in their diet and breeding habits. The hardiness of goldfish allows them to survive harsh winters in Alberta, with a single goldfish potentially producing 40,000 offspring in just three years.
The issue of invasive goldfish is not confined to Alberta but extends globally, as these resilient fish can thrive in various environments. University of Toronto biology professor Nicholas Mandrak highlighted the prevalence of goldfish as “global invaders,” capable of withstanding extreme conditions and proliferating rapidly.
Storm-water management ponds are favored breeding grounds for goldfish due to their warmth and proximity to residential areas, facilitating intentional releases by individuals. Efforts are underway to study and control the spread of goldfish from these ponds into the wild, emphasizing the need for proactive measures to prevent further proliferation.
To address the escalating goldfish problem, the Alberta government urges residents to report sightings of goldfish and other invasive fish to the Aquatic Invasive Species Hotline and report intentional releases to the Report A Poacher hotline. Failure to curb the illegal introduction of goldfish could lead to nationwide implications, impacting native species across the country.