Which type of fish typically requires higher dissolved oxygen levels?

Cold-water fish typically require higher dissolved oxygen levels because they are often found in environments where the water is cooler, which can absorb more oxygen. Species such as trout and salmon thrive in such conditions. These fish have physiological adaptations that make them more reliant on higher levels of dissolved oxygen to support their metabolic processes.

In contrast, bottom feeders often occupy environments where oxygen levels can be lower, as they tend to feed on organic matter that settles on the bottom where respiration rates can be reduced. Pond fish can vary greatly in their oxygen needs, but many can adapt to lower oxygen levels. Luxury seafood, which could include various species from both cold and warm waters, does not specifically denote a requirement for higher levels of dissolved oxygen. The categorization of luxury seafood is more related to economic and gastronomic value rather than biological oxygen requirements.