How is chlorine toxic to fish and other aquatic life?

Chlorine burns the gills and fins of fish, destroys sensory organs, interferes with the ability of fish to find food and causes internal organ damage. If the receiving water contains decaying or organic matter (from decaying plants, algae and bacteria), chlorine can combine with the byproducts to form compounds called trihalomethanes, which are persistent in the aquatic environment and pose a health threat to living things for a long time.

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1. How is chlorine toxic to fish and other aquatic life?
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