Salmon farming threatens the health of wild salmon stocks primarily because

Farmed salmon have the ability to transmit diseases and parasites to salmon in the wild. This can lead to depleted wild stocks, which do not have the resistance to the parasites. The salmon bred in the farms will be resistant to the diseases, but when they mix with the wild salmon, those in the wild will fall prey to many of these illnesses.

A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.