How does presence of algae reduce oxygen content in water?

If the concentration of algae increases in the water body, then it causes depletion of oxygen in the water. This algal bloom covers the water surface, secrete toxins and reduce oxygen content of water. Oxygen deficiency may cause the death of aquatic animals.
 

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The primary source of oxygen for a pond is from microscopic algae (phytoplankton) or submerged plants. In the presence of sunlight, these produce oxygen through photosynthesis and release this oxygen into the pond water. At night and on very cloudy days, algae and submerged plants remove oxygen from the water for respiration
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