He has seen the pristine river of his childhood become polluted and fish populations disappear.

他亲历了儿童时代的河流一步步被污染，鱼类一点点的消失。

youdao

He said that environmental personnel who visited the disaster areas found that the three rivers are highly polluted by dead fish, and he warned locals not to use those waters.

他说考察过灾区的环保人员发现，这三条河都已经被死鱼严重污染。他还呼吁当地居民不要使用那些河水。

youdao

Polluted water kills fish and other Marine life. Pollution of soil reduces the amount of land available for growing food.

被污染的水源会引起鱼类以及其他海洋生物的死亡，被污染的土壤会减少种植农作物的面积。

youdao

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