Larger rainbow trout

Rainbow trout. Image from www.ars.usda.govUS Government researchers at the ARS (Agricultural Research Service – the research arm of the US Department of Agriculture) National Center for Cool and Cold Water Aquaculture have developed an effective way of producing triple set chromosome rainbow trout.

The fish grow larger because they have three sets of chromosones instead of the usual two sets. The third set renders the fish sterile and so the energy from the food they eat is redirected from reproduction to growth.

Consumer desire for an 8 (228g) to 10 (283g) ounce fillet has increased the marketable trout size from one pound (.5 kg) to almost two pounds (1 kg) and the size is continuing to increase.


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