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flag Spiny water fleas, invasive zooplankton from Eurasia, are spreading in five Algonquin Park lakes, threatening fish and ecosystems.

flag Ontario Parks warns of spiny water fleas in five Algonquin Park lakes—North Sea, Manitou, Kioshkokwi, Three Mile, and Rock Lakes—first detected in 2022. flag Native to Eurasia, these 1.5 cm zooplankton reproduce rapidly, survive winter in egg form, and spread via boats, gear, and equipment. flag They disrupt ecosystems by reducing native zooplankton, threatening fish like bass, walleye, and trout. flag Though harmless to humans and pets, they form visible clumps on ropes and hulls. flag Prevention is critical: visitors must clean, drain, and dry all gear and avoid moving between lakes, especially during portages. flag The species is now in all five Great Lakes and over 100 Ontario lakes.

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