Dissolved oxygen is the amount of oxygen in water and is needed for cellular respiration. Rapidly moving water contains more dissolved oxygen than stagnant water, and cold water has more dissolved oxygen than warm water. A large river would probably contain higher amounts of dissolved oxygen than a small pond since the pond water is still.
Though the minimum oxygen concentrations required for different fish vary, water with less than 3 mg/l will typically not support fish. At 3-4 mg/l, fish start gasping for air at the surface, and bacteria may die off. In order for fish to survive indefinitely, the water must have an oxygen concentration of above 5 mg/l.
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