Environmental compartment | Farming method | Species farmed (examples) | Main features |
---|---|---|---|
Freshwater | Extensive (ponds) | Freshwater whitefish (Coregonidae), zander, pike, carp, catfish and crayfish | Natural or artificial ponds adapted to foster the development of the cultivated species |
Intensive (tanks, raceways, earth ponds, recirculating aquaculture systems) | Rainbow trout, catfish and eel | Open-air concrete tanks, raceways (a cluster of consecutively connected tanks) or earth ponds of various sizes and depths adapted to the different developmental stages of the cultivated fish In a raceway, river water is collected upstream and fed back to the river downstream after it has passed through all tanks Recirculating aquaculture systems are closed systems in which effluents from the vessel containing the farmed species are subjected to quality-improving treatments (e.g. filtration and oxygenation) before being fed back to that same container | |
Marine | Extensive (lagoons and coastal ponds) | Sea bass, sea bream (Sparus aurata), eels and different species of mullets, crayfish and shellfish | Lagoons adapted to foster the development of the cultivated species |
Intensive (sea cages) | Finfish (e.g. salmon), sea bass, sea bream and trout (to a lesser extent) | Fish are held captive in large pocket-shaped nets anchored to the seabed |