Why Are Catfish And Carp Found At The Mouth Of A River, While Trout Are Found Nearer The Source?

(Correct Answer Below)

Why Are Catfish And Carp Found At The Mouth Of A River, While Trout Are Found Nearer The Source?

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Catfish and carp require lower levels of oxygen than trout. Since the mouth of a river typically has lower levels of oxygen and the area near the source has higher levels of oxygen, catfish and carp can thrive at the mouth and trout, which require higher levels of oxygen, thrive at the source.

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