There is mass mortality of fishes in a pond. What may be the reasons?

CBSE Class 9 CBSE Class 9 Science
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#1

There is mass mortality of fishes in a pond. What may be the reasons?
Answer:

  • Addition of hot water.
  • Addition of poisonous (mercury) compounds in water.
  • Blockage of gills of fishes with any pollutant.