Final answer:
Cold-water fish such as trout find temperatures of 9 - 13 degrees Celsius stressful due to climate change affecting their required temperature ranges and decreasing oxygen levels in water, which is crucial for their survival.
Step-by-step explanation:
The temperature range of 9 - 13 degrees Celsius is stressful for cold-water fish species such as trout because their survival is closely linked to specific temperature ranges that are being altered due to climate change. In environments like the Chesapeake Bay, warmer temperatures decrease the water's oxygen-carrying capacity, which can lead to oxygen depletion and affect the survival of marine life that depend on certain temperatures and oxygen levels to thrive. Moreover, fish like salmon that migrate from saltwater to freshwater for spawning must undergo complex osmoregulation processes to deal with the different salt concentrations in these environments, and such temperature changes can disrupt these processes, causing additional stress to the fish.