Fish Kills

Some of the most common calls fishery management agencies receive from the public are reports about dead or dying fish in a water body, or fish kills. A fish kill is a common but complex phenomenon. Contrary to popular belief, fish kills are seldom caused by pollution or other human activities. Instead, changes in environmental factors such as temperature, dissolved oxygen, salinity, and acidity are often to blame for fish kills. Changes in some of these factors might not be lethal by themselves, but when combined, can cause a fish kill. In many reported fish kills, it is not possible to determine the cause.

How do I report a fish kill?

How do we respond to a reported fish kill?

What typically causes fish kills in Louisiana?

What is dissolved oxygen?

When can dissolved oxygen levels drop and lead to a fish kill?

Understanding Fish Kills Brochure