Salmonids are a family of fish known as Salmonidae, which includes species like salmon, trout, and char. They are primarily found in cold-water environments, such as rivers and lakes, and are known for their importance in both ecosystems and human economies. Salmonids are characterized by their streamlined bodies, forked tails, and a range of colors that can change depending on their habitat and life stage. These fish are also notable for their life cycles, which often involve migrating from freshwater to saltwater and back again. This unique behavior is especially prominent in salmon, which are famous for their upstream journeys to spawn. Salmonids play a crucial role in their habitats, serving as both predators and prey, and are popular targets for recreational fishing.