Aquaculture
Aquaculture is the farming of aquatic organisms such as fish, shellfish, crustaceans, and seaweed. It can produce food, restore species, support coastal economies, and raise difficult questions about feed, water quality, disease, and ecosystems.
What aquaculture is
Aquaculture is often described as farming in water. It includes the breeding, rearing, and harvesting of aquatic organisms such as fish, mollusks, crustaceans, algae, and aquatic plants. Unlike capture fisheries, which harvest wild populations, aquaculture involves human management of growth, stocking, feeding, protection, or habitat.
Why it is growing
Demand for seafood has risen while many wild fisheries face limits from overfishing, habitat change, climate stress, or management restrictions. Aquaculture can add supply without increasing wild catch, but its benefits depend on species choice, farm design, feed sources, disease control, regulation, and local environmental conditions.
Freshwater and marine farming
Freshwater aquaculture may use ponds, tanks, rice fields, cages in reservoirs, or raceways. Marine aquaculture, also called mariculture, may grow salmon in net pens, oysters on racks or lines, mussels on ropes, seaweed on longlines, or shrimp in coastal ponds. Each system has different water, feed, and ecosystem interactions.
Fed and unfed species
Some farmed species need formulated feed, including many finfish and shrimp. Others, such as many bivalves and seaweeds, filter nutrients or grow from sunlight and dissolved nutrients in the water. Unfed aquaculture can provide food and habitat benefits, while fed systems must manage feed efficiency and ingredient sourcing.
Water quality and health
Farm managers track oxygen, temperature, salinity, pH, waste, stocking density, and disease risk. Poor water quality can stress animals and increase mortality. Biosecurity, vaccines for some species, careful movement of stock, and monitoring help reduce disease spread within farms and between farms and wild populations.
Environmental tradeoffs
Aquaculture can reduce pressure on some wild fisheries, but it can also create pollution, habitat loss, escaped farmed animals, disease transfer, chemical use, or conflicts with other coastal users if poorly managed. Good siting, lower-impact feeds, waste controls, species selection, and transparent regulation shape the outcome.
Restoration and ecosystem services
Not all aquaculture is only food production. Hatcheries can support restoration of oysters, clams, corals, and some fish where ecological goals are carefully defined. Shellfish can filter water, and seaweed can take up nutrients. These benefits are local and must be measured against farm density and ecosystem limits.
Technology and data
Modern farms may use sensors, automated feeders, cameras, genetics, vaccines, water recirculation, selective breeding, offshore cages, and environmental models. Recirculating aquaculture systems can reduce water exchange and move production closer to markets, but they require energy, engineering, and skilled operation.
Why it matters
Aquaculture is now a major part of global aquatic food production. Done well, it can support nutrition, livelihoods, seafood access, and restoration. Done poorly, it can shift environmental costs into waterways and coastal communities. The field is therefore both a food-system opportunity and a governance challenge.