Growing number of 'invasive' goldfish in Kitchener pond sparks concern from locals, advocates

In a May 2026 CBC News feature, food web ecologist Dr. Kevin McCann breaks down how released pet goldfish act as a highly reproductive, competitive invasive species that undergoes runaway population growth. This surge degrades local freshwater ecosystems by driving up water turbidity, outcompeting native biodiversity, and threatening local fish stocks with foreign pathogens. The McCann Lab's contribution to the article underscores the vital importance of public ecological awareness and the preservation of urban aquatic food webs.

https://www.cbc.ca/news/canada/kitchener-waterloo/invasive-goldfish-pond-seen-kitchener-waterloo-1.7547457