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Clock is ticking on new rules targeting invasive species

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Ocean-going ships on the St Lawrence River must start using new treatments that will clear invasive species from their ballast tanks. They have three years - starting today - to buy and install equipment preventing foreign marine life from reaching the St Lawrence and Great Lakes. Invasives - like zebra mussels and round gobies - have no natural enemy here to limit their numbers. They've hurt local aquatic ecosystems. And Jennifer Caddick with Save the River tells Jonathan Brown that current regulations aren't stopping them.

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