Cold-water fish are species that thrive in cooler temperatures, typically found in oceans, lakes, and rivers. They prefer water temperatures below 70°F (21°C) and are often found in northern regions. Common examples include salmon, trout, and cod. These fish have adapted to survive in colder environments, often developing unique physiological traits. These fish are important for both ecological balance and human consumption. They play a vital role in aquatic ecosystems, serving as both predators and prey. Additionally, cold-water fish are popular in the fishing industry and are often sought after for their flavor and nutritional value, rich in omega-3 fatty acids.