Salmon and trout are both belong to the same family, and some species that are often called salmon, are actually trout! 

Trout are found in many rivers and lakes around the world. They are typically brown with orange spots on their scales. Unlike trout, salmon are native in the Northern Hemisphere, but have been introduced to other environments. They are often pinkish-red or orange because they feed on shrimp, plankton, and other small crustaceans while they grow up in freshwater before heading to the ocean as adults. 

Read: Trout vs. Salmon: All You Need to Know