Calgary Battles Alien Carp Invasion

Calgary is grappling with an influx of Prussian carp, an invasive fish species that has infiltrated local stormwater ponds, notably in the Evanston community. These fish possess the alarming ability to reproduce asexually, creating clone-like offspring and potentially overwhelming drainage systems.

Experts believe the initial introduction of Prussian carp into Alberta, the first North American location for the species, likely stemmed from illegal dumping of unwanted pet fish. The fish have since spread through river systems into Saskatchewan and various Alberta waterways, including the Bow and North Saskatchewan rivers.

Their resilience to poor water conditions, rapid breeding, and displacement of native species present significant ecological challenges. The City of Calgary is now formulating a comprehensive five-year plan to track and manage these invasive fish, emphasizing early intervention as crucial for control.

In a separate wildlife concern within Canadian national parks, elk have been identified as causing more aggressive encounters with humans than bears. Between 2010 and 2023, elk were involved in 62% of reported aggressive incidents, often due to people approaching too closely, especially when elk are protecting young or during mating season.

Parks Canada advises visitors to maintain a safe distance of at least 98 feet from elk and larger animals, employing various methods to deter elk from populated areas when necessary. Visitors are urged to be cautious and respectful of wildlife boundaries.