We have updated the mainstem timed classification based on all the results from 2012 and 2103. The classification is produced by ranking the results, split in five bands, then identifying the breakpoints between each band. The results from the Avon mainstem surveys are shown in the table below. Each of the bands has been colour coded with dark green used for the top 20% or top fifth of the results, then light green, yellow, amber and red for the bottom 20% of results, just like a glorified traffic light system.
I commented last week on the small size of parr in the upper Avon. Subsequently I have had a quick look at the mean size of the one year old parr, although this was based only on an assessment of the sizes by eye. Scale reading will be required to establish the breakpoints between one and two, older parr.
For comparison the mean size of the one year old salmon parr in the lower Livet site was 94.1mm, 10mm larger than the highest mean of any site on the Avon. The Livet is a far richer river than the Avon and high densities of good size fry and parr can be supported there.