Fish farming, or raising fish in tanks or ponds, is called

Concept: Commercial breeding of fish, usually for food, in fish tanks or artificial enclosures such as fish ponds is known as fish farming or pisciculture. 

It  involves the regulated cultivation and harvesting of aquatic animals such as fish, crustaceans, molluscs, and other organisms in a natural or artificial environment.

Hence, option 3 is the correct answer.