High water temperatures and trout

It is that time of year when, on some rivers and lakes, 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. 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.