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Why are rivers important for fisheries?

Answer and explanation

Correct answer: They provide aquatic habitat and nutrients

The direct answer is A: rivers provide aquatic habitat and nutrients. Fish need water, shelter, suitable temperature, oxygen, food, and places for breeding. A river channel, pools, plants, and nearby wetlands can provide these conditions. Flowing water also carries nutrients and supports small organisms that become food for fish. Clean water is especially important because pollution can injure or kill aquatic life and reduce fish resources. Option A is correct because it states the real ecological reason for the importance of rivers in fisheries. Option B is wrong because fish grow in water, not on land. Option C is wrong because rivers do not always close or block the sea; many rivers flow into it. Option D is wrong because river water is not permanently changed into ice under normal conditions, and frozen water cannot serve as an ordinary fish habitat. Memory cue: fisheries need habitat plus food, and rivers provide both.

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DrainageRiversFisheries

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