A certain lake in the arid west contains an endangered species of fish. The legal status of this fish required water diversions out of the river feeding the lake to be decreased substantially. About 10 years following this decree, the declining cottonwood forest and canopy along the riverbanks was noted to be recovering. Resurgence of the cottonwood forest along the riverbank led to cooler water in certain areas of the river. Cool water contains more oxygen than warm water. How would this cooler water affect the native fish populations in the river