Summary:

- The article discusses the impact of post-wildfire runoff on freshwater fish in rivers. It explains that the ash and debris carried by runoff can have significant consequences for aquatic ecosystems.

- Wildfires can increase the amount of sediment, nutrients, and contaminants in rivers, which can negatively affect fish populations. This can lead to reduced oxygen levels, impaired gill function, and even fish kills.

- The article emphasizes the need for further research to understand the long-term effects of post-wildfire runoff on freshwater fish and to develop strategies to mitigate the impacts on these important aquatic species.