Invasive Prussian Carp Infest Calgary Stormwater Pond, Threatening Local Ecosystems

A stormwater pond in Calgary's Evanston community appears to be teeming with Prussian carp, sparking alarm among residents about the potential spread of this invasive species. The discovery highlights how easily unwanted aquarium pets can establish themselves in local waterways, posing a threat to native ecosystems.

Experts believe the proliferation of Prussian carp, which are native to central Europe and Asia, may have originated from the illegal dumping of pet fish. These fish are particularly problematic due to their resilience, ability to thrive in poor water quality, and rapid reproduction through parthenogenesis, where a single female can produce all-female, clone-like offspring. This means a single fish can initiate a new population.

The presence of Prussian carp in storm ponds poses a direct threat to urban infrastructure and environmental health. Storm ponds are designed to manage flood risks and filter water before it enters the Bow River. An infestation of invasive fish can complicate these functions, potentially leading to increased costs for mitigation and making it harder to protect the local environment. Invasive species disrupt native food chains and can degrade natural water systems over time.

Recognizing the broader issue, the City of Calgary is implementing a city-wide plan to track and manage invasive species. Councillor Jennifer Wyness stated that the city is working on a comprehensive five-year strategy. Officials emphasize that early detection and prevention are key, as removing established populations is extremely difficult. Dumping live fish into city storm ponds is illegal and can result in fines of up to $3,000. Residents are urged to report sightings of fish in storm ponds to 311 immediately.

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Evanston is not facing this alone. I will keep you updated as the City releases their 5-year plan for invasive species in our waterways later this year.