Question

the artificial rearing of fish and prawns is called
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Answer 1

Answer:

Fish farming or pisciculture involves raising fish commercially in tanks or enclosures such as fish ponds, usually for food. It is the principal form of aquaculture, while other methods may fall under mariculture.

Explanation:

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Answer 2

Answer:

Fish farming or pisciculture involves raising fish commercially in tanks or enclosures such as fish ponds, usually for food. It is the principal form of aquaculture, while other methods may fall under mariculture.

Oxygen: 6 mg/l for coldwater fish; 4 mg/l for warmwater fish

Selenium: < 0.01 mg/l

Zinc: < 0.005 mg/l

Copper: < 0.0006 mg/l in soft water; <0.03 mg/l in hard water

Explanation:

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