 |
 |
 |
 |
|
|
|
|
| Fish Eating Birds and Salmonids in Scotland |
| Table 4.2. The calculated intake rates (fish/bird/day) of fish-eating birds at six times of year on 13 rivers and 2 lochs in Scotland. The categories of fish consumed are all salmon (all S), only salmon greater than 89mm (S>89mm), all brown trout (all T) and only brown trout greater than 199mm (T>199mm). ‘n’ is the number of stomachs on which the calculation is based. |
Bird species |
Location |
Month |
n |
All S |
S>89mm |
All T |
T>199mm |
| Goosander | Beauly | Mar/Apr | 14 |
25.36 |
19.00 |
11.53 |
0.00 |
| Conon | Mar/Apr | 10 |
4.64 |
1.87 |
5.70 |
0.21 |
|
| B. Esk | Mar/Apr | 102 |
6.40 |
2.84 |
16.48 |
0.38 |
|
| Dee | Mar/Apr | 31 |
18.36 |
8.86 |
10.50 |
0.40 |
|
| Nov/Dec | 53 |
16.90 |
11.26 |
13.75 |
0.27 |
||
| Deveron | Mar/Apr | 24 |
19.22 |
12.04 |
9.62 |
0.16 |
|
| Jan/Feb | 40 |
7.33 |
4.97 |
11.15 |
0.39 |
||
| Nov/Dec | 19 |
8.34 |
7.03 |
10.49 |
0.35 |
||
| N. Esk | Mar/Apr | 20 |
8.75 |
6.69 |
16.05 |
0.13 |
|
| S. Esk | Mar/Apr | 12 |
11.78 |
6.62 |
23.58 |
0.00 |
|
| Spey | Mar/Apr | 26 |
17.43 |
9.20 |
10.63 |
0.00 |
|
| Tay | Mar/Apr | 19 |
6.43 |
2.32 |
19.55 |
0.16 |
|
| Annan | Mar/Apr | 25 |
3.48 |
1.31 |
15.28 |
0.25 |
|
| Nith | Mar/Apr | 59 |
6.88 |
1.76 |
7.43 |
0.00 |
|
| Tweed | Mar/Apr | 340 |
7.97 |
4.79 |
8.32 |
0.26 |
|
| Jan/Feb | 91 |
2.81 |
1.83 |
3.98 |
0.29 |
||
| Nov/Dec | 44 |
5.65 |
2.84 |
12.11 |
0.22 |
||
| May/Jun | 24 |
2.58 |
1.80 |
8.87 |
0.00 |
||
| G ducklings | Tweed | July | 11 |
4.50 |
0.00 |
4.50 |
0.00 |
| G ducklings | Dee | July | 25 |
23.75 |
2.50 |
3.24 |
0.00 |
| G juveniles | Dee | August | 13 |
60.59 |
12.42 |
5.01 |
0.00 |
| R-b merganser | Conon | Mar/Apr | 14 |
6.96 |
4.25 |
9.65 |
0.00 |
| B. Esk | Mar/Apr | 15 |
7.76 |
1.48 |
15.00 |
0.00 |
|
| Laggan | Mar/Apr | 21 |
27.21 |
3.33 |
23.95 |
0.00 |
|
| N. Esk | Mar/Apr | 30 |
19.92 |
9.65 |
14.41 |
0.00 |
|
| S. Esk | Mar/Apr | 30 |
15.85 |
6.14 |
29.28 |
0.00 |
|
| Spey | Mar/Apr | 13 |
19.56 |
8.47 |
11.54 |
0.00 |
|
| Tay | Mar/Apr | 12 |
21.66 |
4.40 |
13.67 |
0.00 |
|
| Rbm ducklings | N. Esk | Jul/Aug | 18 |
23.66 |
0.60 |
5.39 |
0.00 |
| Cormorant | B. Esk | Nov/Dec | 10 |
0.46 |
0.23 |
2.44 |
1.33 |
| Deveron | Jan/Feb | 14 |
1.01 |
1.01 |
14.89 |
1.92 |
|
| Nov/Dec | 46 |
3.02 |
2.40 |
8.24 |
1.14 |
||
| Laggan | Mar/Apr | 14 |
7.75 |
4.42 |
22.86 |
2.56 |
|
| Annan | Mar/Apr | 10 |
1.32 |
1.32 |
13.93 |
0.20 |
|
| Nith | Mar/Apr | 19 |
0.39 |
0.31 |
5.55 |
1.25 |
|
| Tweed | Mar/Apr | 74 |
3.10 |
2.56 |
6.20 |
0.53 |
|
| Cobbinshaw | Mar/Apr | 10 |
0.00 |
0.00 |
2.29 |
1.85 |
|
| Loch Fad | Jan/Feb | 22 |
0.00 |
0.00 |
0.47 |
0.16 |
|
| Nov/Dec | 11 |
0.00 |
0.00 |
0.29 |
0.29 |
||
|
|
|