High water temperatures and trout

It’s hot! Very hot in some places. 

A combination low water levels plus hot sunshine means high water temperatures and low oxygen levels. Once the water temperature reaches 20 – 21C, our native brown trout start to struggle and even best practice catch and release can result in unintended mortality. 

Bear in mind that the air temperature in the evenings is cooler, but the water temperature may not be. Take the temperature of the water before you fish and if it is at or around 20C, it is better not to fish.

If you would like to know more about the effect of temperature on trout and salmon, click here. 
Thank you Wynn Davies (aka Torgoch) for reminding us about this paper.