Intensive Aquaculture

Intensive aquaculture systems water flows in and out continuously (flow through). This allows higher stocking densities. The intensive aquaculture system  require supply of quality water. Not as much of land is required to produce the same quantity of fish as compared to extensive and semi intensive systems. In the EU, 80% of farmed fish production is the following four species that are intensively farmed: rainbow trout (reared both in freshwater and at sea) and marine fishes Atlantic salmon, gilthead sea beam and European sea bass In intensive farming, the fish are kept at too high a stocking density to obtain significant amounts of feed from their environment.
In Vietnam pengaius catfish half of the production is for export US and EU being leading importers and it is farmed intensively, in the last decade Vietnamese production of pangasius has increased 10-fold  to 1.1 million tonnes in 2010 (78% of global farmed pangasius production) of which 0.66 million tonnes was exported.
Extremely high stocking densities square measure created potential by a high rate of water exchange and by the power of pangasius to breathe atmospherically chemical element that makes them able to tolerate low levels of dissolved chemical element and extremely contaminated water. Small-scale Lake Polyculture systems square measure being replaced by intensive monocultures that rear pangasius in ponds (which exchange water with near watercourse tributaries by periodic.
Event exchange and pumping) and in web cages and web pens sited on Major watercourse tributaries of the Mekong River delta. Intensive monoculture ponds And web pens square measure sometimes stocked with at 40-60 fish per square metre,Ponds generally even higher. Stocking densities for web cages square measure usually 100-150 fish Per square metre.