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According to the standard NCERT treatment, the minimum dissolved oxygen needed for good growth of fish in a water body is about:

  1. A15 ppm
  2. B1 ppm
  3. C6 ppm
  4. D0.5 ppm

Answer: C

Fish need dissolved oxygen of about 6 ppm or more for good growth. Much lower values stress or kill aquatic life.
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