Salmon .. Transfer the responsible antifreeze gene to Atlantic salmon to increase its resistance to cold and prevent ice crystals from forming in the serum

Many cold-water marine fish produce "freeze-blocking" proteins and protect them from preventing the formation of ice crystals in the serum, but Atlantic salmon does not have genes to produce these proteins and therefore can not live in ice water.
The responsible antifreeze genes have therefore been transferred to Atlantic salmon to increase their resistance to cold, thus expanding the area of the environment in which the species can be raised.