Dissolved Oxygen
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<fishfyi-glossary slug="dissolved-oxygen"></fishfyi-glossary>定义
The amount of oxygen gas dissolved in water, critical for fish survival. Warm water holds less oxygen than cold water, and low levels cause fish stress and mortality.
详细说明
Dissolved oxygen (DO) in water at saturation is 14.6 mg/L at 0 °C and only 7.6 mg/L at 30 °C — a near-halving that explains why warm-water fish kills are common in summer. Fish behavioral responses to hypoxia include surface skimming (aquatic surface respiration), reduced activity, and habitat abandonment. Obligate air-breathing fish (labyrinth fish, lungfish) tolerate near-zero DO. Oxygen requirements vary by species: cold-water salmonids require >7 mg/L while warm-water catfish tolerate <2 mg/L. Nighttime DO dips in heavily vegetated waters as plants switch from oxygen production to respiration can cause dawn fish kills even in otherwise healthy systems.