How Much Dissolved Oxygen In Water Is Needed For Fish

The amount of dissolved oxygen needed varies from creature to creature. Bottom feeders, crabs, oysters and worms need minimal amounts of oxygen (1-6 mg/L), while shallow water fish need higher levels (4-15 mg/L)⁵. Microbes such as bacteria and fungi also require dissolved oxygen. How much dissolved oxygen do fish need to survive? Warm-water fish usually…