Salmon is a type of cold-water fish and is a subset of salmon and is slightly larger than salmon. The maximum length of salmon is 140 cm and it weighs about 5 kg. Cold-water fish thrive in positive temperatures of 12 to 18 degrees Celsius, and temperatures above 24 degrees Celsius kill this type of fish. The high protein and omega-3 fatty acids in salmon are a good alternative to red meat and chicken.