Threats from the invasive Quagga mussel species are growing in deeper parts of the Great Lakes, just as zebra mussels have altered ecosystems in shallower water closer to shore. Quagga mussels compete for food with a number of young fish species, putting commercial and recreational fishing at risk, and also threaten historic wrecks. A look at how widespread the problem is, and efforts to control the invasive species, with the team behind documentary All Too Clear.
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The Agenda with Steve Paikin (Audio)