Oncorhynchus mykiss, commonly known as the rainbow trout, is native to cold-water tributaries of the Pacific Ocean in Asia and North America. It features a distinct pink stripe along its side, black spots on its back and fins, and a silvery belly. This species is known for its adaptability, thriving in diverse aquatic environments, and is a popular subject in recreational fishing.

Oncorhynchus mykiss, commonly known as the rainbow trout, is native to the cold-water tributaries of the Pacific Ocean in Asia and North America. Specifically, it is indigenous to the western coast of North America from Alaska to Mexico, as well as parts of Asia including the Kamchatka Peninsula.

Rainbow trout typically inhabit freshwater environments with cold, clear, and well-oxygenated water. They are often found in streams, rivers, and lakes, preferring water temperatures between 12°C and 20°C. These environments usually have gravel bottoms and ample cover such as rocks or submerged vegetation.

Rainbow trout occupy an ecological niche as both predator and prey. They primarily feed on aquatic and terrestrial insects, crustaceans, and smaller fish, playing a crucial role in the aquatic food web. The species is adapted to a variety of water conditions but thrives in environments where the water is clean and supports a diverse range of aquatic life.