Aquaculture of salmonids.

http://en.wikipedia.org/wiki/Aquaculture_of_salmonids

The aquaculture of salmonids is the farming and harvesting of salmonids under controlled conditions. Salmonids (particularly salmon and steelhead), along with carp, are the two most important fish groups in aquaculture.The most commonly farmed salmonid is the Atlantic salmon. Other commonly farmed fish groups include tilapia, catfish, sea bass and bream.

In 2007 the aquaculture of salmonids was worth US$10.7 billion. Salmonid aquaculture production grew over ten-fold during the 25 years from 1982 to 2007. Leading producers of farmed salmonids are Norway with 33 percent, Chile with 31 percent, and other European producers with 19 percent.

There is currently much controversy about the ecological and health impacts of intensive salmonids aquaculture. There are particular concerns about the impacts on wild salmon and other marine life. Some of this controversy is part of a major commercial competitive fight for market share and price between Alaska commercial salmonid fishermen and the rapidly evolving salmonid aquaculture industry.

                                               Salmon egg hatching. In about 24hrs it will be a fry without the yolk sac.

Male ocean phase Coho salmon

male ocean phase Chinook

male freshwater phase Chinook