Scientists tracked 19 adult goldfish in Lake Ontario’s Hamilton Harbour: 2 years later, survivors still overwintered in the same areas and returned each spring

Scientists who fitted acoustic tags onto adult goldfish living wild in Hamilton Harbour on Lake Ontario have found that the fish are creatures of habit. Tracked over two full years, the surviving goldfish returned to the same overwintering grounds and the same spawning sites every single season, a pattern that helps explain why this ornamental pet turned invasive species has become so difficult to remove from the Great Lakes.

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