Dead fish were found in a west-end Toronto pond. Authorities are trying to find out why | CBC News
Briefly

Investigation is ongoing after several dead fish were found in Toronto's Topham Pond, with no signs of chemical spills. Authorities suggest recent temperature variations may contribute to the die-off. A microbiologist indicated that the fish likely died from algae blooms, which consume oxygen when decaying. This situation is considered normal, occurring annually due to decaying algae. A family fishing event was canceled because of health concerns stemming from the fish die-off. The Toronto and Region Conservation Authority will collaborate with the city for cleanup if needed.
"TRCA is working with the city to address this situation and have shared that recent temperature fluctuations in the past few weeks may be a natural cause of the dead fish in the pond."
"Every year, we have some lack of oxygen and it's coming from the decaying algae [which means] fish are dying," said Pawlikowski. "The blooming algae and then lack of oxygen at the last stage when they are decaying underwater is normal around the world."
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