Better Control of Reproduction in Trout and Salmon May be in Aquaculture's Future

Fast-growing farm-raised salmon and trout that are sterile can now be produced using a method developed by Agricultural Research Service (ARS) scientists. Blocking reproduction can enhance growth, and is important for fish being reared in situations where reproduction is undesirable.

The method allows researchers to more efficiently and reliably produce fish that have three sets of chromosomes, instead of the usual two sets. Fish with the extra set of chromosomes can't reproduce, so the energy from the food they eat is shifted .... http://www.ars.usda.gov/is/pr/2010/100721.htm