Upper Avon invertebrate sample

On Friday we collected a standard three minute kick sample from the wide shallow riffle just upstream of Faindouran Bothy in the upper River Avon. This site was just below 600m (2000′) but the river was still over 30m wide at this point. The sample did not take long to sort and identify as there was very little present. There were 3 or 4 stoneflies, same for mayflies and caddis and a few worms and assorted others. The most numerous invertebrates present were small mites.

Very sparse incertebrate sample from Faindouran Bothy in the upper Avon. The fish up there were very small, the fry just over 30mm and the one year old parr just over 50mm.

Invertebrate sample from Faindouran Bothy in the upper Avon. The fish up there were very small, the salmon fry just over 30mm and the one year old parr just over 50mm. This was collected in late summer so some species would have already hatched but this is a very sparse sample; it is a hard living for a fish in such low productivity water and at such high altitude – extreme salmon live in the upper Avon.

For anyone wondering why the upper Avon supports less fish that the Livet have a look at the sample below, taken from the River Livet at Whitefolds a few weeks ago.

River Livet upper sample: clockwise from top left, caddis, stoneflies, mayflies and Diptera etc

River Livet upper sample: clockwise from top left, caddis, stoneflies, mayflies and Diptera etc

 

There are 2 comments for this article
  1. Bernard Hammick at 8:40 am

    Those samples from the Livet are unbelievable compared to the Avon!!! As you say, no wonder the Livet supports more fish.

    • Brian Shaw Author at 8:54 am

      Hi Bernard, thanks for the comment, we also have a sample taken from the lower Avon a couple weeks ago which was much richer than found the top end, I’ll post that result when I get a chance. A salmon parr doesn’t need that much food but there has to be something to eat!
      Best regards
      Brian

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