Parks Canada says it received calls on Jan. 7 after a large number of deceased or dying fish was found in the lakes.
Parks Canada says a phenomenon called"winterkill" is behind the death of thousands of fish in Vermilion Lakes, near Banff.
According to officials, the fish died due to a extremely low level of dissolved oxygen levels, a naturally occurring condition called"winterkill." The drop in the amount of oxygen available for aquatic life below the ice can then cause"mass fish die-offs," Parks Canada said."Larger lakes hold more oxygen and are more resilient to winterkill," Parks Canada explained."Both of these species are common in Canada and are not species at risk," said Parks Canada.
Parks Canada says it will be monitoring Vermilion Lakes and may consider further intervention methods if needed.
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