There is an increased threat of infection and disease from polluted waste, and from eating fish that swallowed waste.

VOA: special.2009.09.22

Every year volunteers of the fish conservation group, Trout Unlimited, donate 500, 000 hours to clean up polluted rivers, restore fish habitat and fish populations.

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Every year those volunteers donate 500, 000 hours to clean up polluted rivers, restore fish habitat and fish populations.

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That could mean that fish distributions are being affected, as fish avoid places polluted by man-made noise.

BBC: Earth News - 'Noise pollution' threatens fish