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What do the presence of fish and a wide diversity of invertebrates in a river indicate regarding water quality?

What do the presence of fish and a wide diversity of invertebrates in a river indicate regarding water quality?
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what do the presence of fish and a wide diversity of invertebrates in a river indicate regarding water quality?

User FAX
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It indicates that the river water is very good quality with nutrients and minerals to support an ecosystem.
User RWC
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