US EditionHundreds of dead fish wash up along shores of Lake Ontario
- During May and June 2025, numerous deceased alewife, a herring species, have been found along the shores of Lake Ontario, including areas such as Humber Bay Park West and Burlington.
- The die-off results from spawning stress, rapid temperature changes, and weakened conditions after a cold winter, compounded by a recent significant wind storm.
- Alewife are a non-native herring species that migrate from deep cold waters to shallow warmer areas to spawn but are sensitive to abrupt cold upwellings and weather shifts.
- A representative from the local conservation authority noted that last week’s storm stirred up cold water from deeper areas, leading to fish becoming disoriented, swimming erratically, and experiencing higher mortality rates this season.
- Officials and experts state these events are natural, recurring phenomena that cause no wider environmental crisis and predict that such mortality events may increase with climate-driven extreme weather.
16 Articles
16 Articles
Collingwood Today
What's with all the dead fish showing up in Lake Ontario?
Residents around Oakville's Bronte Harbour have been alarmed by the sight of thousands of dead fish washing ashore since yesterday — where did they come from? And who's going to clean it up?
Hundreds of dead fish wash up along shores of Lake Ontario
Videos and images of scores of dead fish near the shores of Lake Ontario have been making the rounds on social media and alarming some residents but experts say that the “die off” is a natural phenomenon which happens periodically in the Greater Toronto Area.
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