What are the differences between salmon living in freshwater versus saltwater environments?

Salmon living in freshwater environments typically have a more streamlined body shape and brighter colors compared to those in saltwater. They also have different behaviors and diets, with freshwater salmon often feeding on insects and other small organisms, while saltwater salmon feed on larger prey like fish. Additionally, freshwater salmon must navigate obstacles like dams and predators, while saltwater salmon face challenges such as predators and changing ocean conditions.