Aquaculture

Aquaculture - the raising and harvesting of fresh- and saltwater plants and animals. The most economically important form of aquaculture is fish farming, an industry that accounts for nearly 20% of world fisheries production, and is steadily increasing its share. Formerly a business for small farms, it is increasingly pursued by large agribusinesses. Successful aquaculture takes into consideration the biology of the aquatic species (feeding, water flow and temperature needs, disease prevention) and engineering design (water source and water quality study, pond and tank containment systems, water filtration and aeration) as well as issues pertinent to any business. Common products of aquaculture are catfish, tilapia (St. Peter's fish), trout, crawfish, oysters, shrimp, and salmon, and tropical fish for aquariums. Some are raised in huge freshwater tanks or ponds; others require the running water of rivers or streams. Saltwater species are often raised in saltwater ponds, in enclosed bays, or in pens placed in coastal or deeper sea waters.

There are potential environmental problems associated with aquaculture. Most of the fish that are raised are genetically altered or hybridized for quick growth. If they escape into the wild, they compete against and can crowd out smaller or less voracious native fish. In addition, the large amounts of water that are used in aquaculture become laden with fish feces and unconsumed food that, if not removed through treatment, can add injurious amounts of nitrogen and phosphorus to a river or stream when the water is returned to it. Development of improved recirculating-tank technologies, however, may lead to a reduction in such pollution threats, as well as the spread of aquaculture to areas where large volumes of water are not available in the environment.

The practice of aquaculture dates back to 1000 b.c. in China. It is growing worldwide, in part in response to overfishing and the deterioration of the world's fisheries and concerns about the effects of pollution on seafood. In the United States, aquaculture is also a response to the increased demand for fish and shellfish as a result of changes in the nation's eating habits.

See M. Landau, Introduction to Aquaculture (1992).

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