Commercial breeding of fish, generally for food, in fish tanks or artificial enclosures such as fish ponds are known as fish farming or pisciculture. It is a form of aquaculture that involves the regulated growing and harvesting of aquatic species such as fish, crustaceans, mollusks, and other organisms in a natural or artificial environment. A fish hatchery is a facility that releases juvenile fish into the wild for recreational fishing or to augment a species' natural population. Carp, catfish, salmon, and tilapia are the most significant fish species produced in fish farming across the world. Global demand for dietary fish protein is increasing, which results in widespread overfishing in wild fisheries, which has resulted in significant reductions in fish populations and, in some cases, complete depletion in some regions. Fish farming allows the development of artificial fish colonies with adequate feeding, protection from natural predators and competitive threats, access to veterinarian services, and easier harvesting when necessary. All while remaining separate from wild fish populations and thus having little impact on their long-term yields. Fish farming is performed all around the world, but China accounts for 62 percent of all farmed fish. In 2016, aquaculture accounted for more than half of the total seafood output.
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