At the end of June I was guiding on 2 different Yorkshire Dales rivers when the trout reacted in a totally different manner to outbreaks of thunder and lightening.

On the first day the fish were active all morning and up until around 1.30 when things suddenly went dead, we fished two pools without an offer whereas up until then we had fish or at least a chance or two in every pool we fished, we then heard the first clap of thunder.  The storm took an hour and a half or more to pass and we sat it out in a safe place, after it had passed we fished for another hour with not a single offer before the river started to rise and we packed it in around 4.30.  Nothing unusual in that then, in my experience it’s just what I would have expected with a sudded drop in air pressure associated with thunder would be that the fish would stop feeding.  I had always wondered why this was until I fished one day I fished with a marine biologist, I asked him the question, “easy he said, a sudded drop in air pressure sucks the oxygen out of the water”.  He then went onto explain the process and I pretended to understand!

 

On the second day on another river exactly the opposite happened.

 

Second Day Before the Thunder.

We fished for two and a half hours in the morning with just one half hearted offer and then suddenly in the next pool Marcus had three fish in under ten minutes all on the Tenkara rod, moments later we heard the first clap of thunder, as before we sat it out but this time the storm passed over this time in just over half an hour.  We fished for the remainder of the day and the fish were active in every pool we fished.  Strange, why should they be turned off one day and on the other??

 

Answers on a postcard please……