Oncorhynchus nerka, commonly known as sockeye salmon, is a species of fish found in the northern Pacific Ocean and rivers that flow into it. They are known for their vibrant red flesh and distinctive green heads during spawning. Sockeye salmon typically migrate from the ocean to freshwater rivers to reproduce, a journey that can cover hundreds of miles. This species plays a crucial role in its ecosystem, serving as a food source for various predators, including bears and eagles. Sockeye salmon are also important for commercial fishing and are often sought after for their rich flavor and nutritional value.