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OTFA Electrofishing 2008
Summary of results
Burn |
Site |
Trout per m2 |
||||
2004 |
2005 |
2006 |
2007 |
2008 |
||
Netherbrough |
NB2 |
1.24 |
2.26 |
3.43 |
- |
2.43 |
Tormiston |
TM1(trout) |
4.29 |
2.93 |
1.62 |
- |
2.10 |
|
TM1(salmon) |
- |
- |
- |
- |
0.34 |
|
TM2 |
5.25 |
3.75 |
3.61 |
- |
0.97 |
Bigswell |
BG2 |
5.6 |
1.47 |
1.36 |
1.26 |
2.34 |
Voy |
VY1 |
1.36 |
2.43 |
1.18 |
2.11 |
0.58 |
Lyking |
LK1 |
- |
0.23 |
0.16 |
0.15 |
0.17 |
Burness |
BN1 |
- |
0.16 |
0.13 |
0.77 |
0.90 |
Kirbister |
KB1 |
1.70* |
2.16 |
1.12 |
0.54* |
- |
Ireland |
IR1 |
0.42 |
1.00 |
0.70 |
1.20 |
0.98 |
|
IR2 |
0.36 |
0.73 |
0.92 |
0.60 |
0.70 |
Rossmyre |
RM1 |
1.59 |
1.17 |
0.72 |
3.22 |
1.49 |
Wideford |
WF3 |
- |
0.29 |
0.04 |
2.11* |
2.34* |
Whaness |
WN1 |
0.38 |
0.37 |
0.47 |
0.55* |
0.26* |
Ore |
OR1 |
0.31 |
0.43 |
0.45 |
0.46* |
0.25* |
Sourin |
SN1 |
- |
0.63 |
1.08 |
0.96 |
- |
Desso |
DS2 |
0.07 |
0.03* |
0.40 |
0.21* |
- |
Quina |
QN1 |
0.07* |
0.03* |
0.13* |
- |
- |
- Salmon fry were found at a density of 0.34 m-2 at site TM1. Origin as yet unknown but samples to be collected for analysis.
- The relatively low density of trout fry at TM2 was almost certainly due to recent dredging of the burn at this site and further downstream to the end of the field boundary.
- Trout density at Voy was lowest recorded so far – the burn was not stocked in 2008.
- Trout density in sea trout burns varied. Increases were again noted at Wideford and Burness, where a pollution incident was reported in late June 2008 – no evidence was found and trout density at the site was healthy. The new sewage pipe has also been laid right through the site (buried under burn bed).
- Density at other sea burns was generally less, but in line with previous year’s results and indicative of healthy populations.