Question

What way be the reason for mass mortality of fish in a pond

Answer 1

The most common causes of fish kills are oxygen depletion, algal blooms (could deplete oxygen or be toxic), pesticide toxicity and disease. By far, the most common cause of fish kills is oxygen depletion in lakes or ponds. ... There are two types of summer fish kill related to lack of oxygen in your lake or pond

Answer 2

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