what causes mass fish kills?
Landslides loaded with toxic heavy metals pour into waterways, causing mass fish kills; experts blame fracking. Tuesday, June 14, 2016 by: Daniel Barker. Tags: fracking, toxins, heavy metals.
The most common cause is reduced oxygen in the water, which in turn may be due to factors such as drought, algae bloom, overpopulation, or a sustained increase in water temperature. Infectious diseases and parasites can also lead to fish kill. Toxicity is a real but far less common cause of fish kill.