As water temperature increases, the amount of oxygen it can hold decreases. This is because oxygen is less soluble in warm water than in cold water. The relationship between water temperature and oxygen solubility is inverse, meaning that as one increases, the other decreases. This relationship is important for aquatic life, as oxygen is essential for the survival of most aquatic organisms. When water temperatures are too high, oxygen levels can become too low for fish and other aquatic organisms to survive.