Coldwater fish require coldwater rivers, streams, and lakes. These habitats are very sensitive to changes in temperature and so are their associated fish ¹. If a stream is too warm, a coldwater fish could take a much longer time to grow, have greater susceptability to poisons and parasites in the water (resulting in disease), and is likely to experience more anaerobic (low oxygen) conditions ¹. This could result in mortality if a coldwater fish can not move to a colder stream. Common coldwater fish include Brook Trout in aquatic freshwater systems, and Atlantic Cod in marine systems.