Over the last week or two we have completed surveys on the Knockando, Cally, Ringorm, Tommore and Corrie Burns to investigate survival of the fry and 0+ parr stocked in 2012.
Today it was the turn of the Tommore and Corrie Burns. I reported on the stocking and monitoring carried out in these burns last year – see here. We repeated the same sites today, a year and two weeks on from the date when they were stocked in 2012 with fed fry. We found good numbers of salmon parr in the lower Tommore Burn site. In a site about 30m long we found 10, 4 and five parr in the 1st, 2nd and 3rd runs down the site. The first run results were in the moderate category in the SFCC classification scheme but the minimum density found over all three runs was approximately 27.8 parr/100m2, not a bad result. The results from the upper Tommore site were lower at about 8.4/100m2 although this was from one run only (in the lower site we caught 52% of the parr in the 1st run).
The habitat in the Tommore Burn is exceptionally good with high coverage of long trailing moss on the rocks, to the extent that the fish were difficult to extract whilst electrofishing.
Salmon parr were found in all three Corrie Burn sites although in lower density than in the Tommore. Instream cover in the Corrie Burn is not of the same quality as that found in Tommore Burn, although in the middle site it was quite good. That is the site where we found the highest density, 11.4/100m2 for a single run only. The salmon parr in the Corrie Burn were noticeably larger than in the Tommore, up to 116mm – good for a 1+ parr. The Corrie Burn stocked fish maintained the size advantage noted over the Tommore Burn when we surveyed last September.
I haven’t had a chance to calculate the densities for the other burns surveyed but they were probably lower than found today. Salmon parr were found in all but one site, it being on the upper limit of stocking in the Knockando Burn.
Tomorrow we intend to survey the Mulben Burn; it was stocked last September with 0+ parr.