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How is life of organisms living in water...

How is life of organisms living in water affected when water gets polluted?

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Water gets polluted from domestic wastes, fertilisers, pesticides (from fields) and industrial wastes.
(a) Fertilisers and domestic wastes cause eutrophication or excessive growth and increased organic loading. This reduces oxygen available to aquatic animals.
(b) Domestic waste carries pathogens of a number of diseases. Some of them can cause diseases in aquatic animals as well.
(c) Pesticides and industrial wastes carry toxins that directly harm the aquatic organisms.
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