Fish-Eating Birds and Salmonids in Scotland :A9

Fish-Eating Birds and Salmonids in Scotland

APPENDIX 5.1.

The stomach contents of goosanders, 1990-96.

(1) RIVER ANNAN

a) "spring" 1992.

3 carcases, 3 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	6	79
minnow	24	39
salmon	5	28
stone loach	2	8
3-sp.stickleback	4	2
totals	41	155

b) (no date) 1993.

2 carcases contained:

17 minnows (21g), 5 trout (19g), 9 3-sp. stickleback (7g) and 3 stone loach (6g).

c) March/April 1994.

13 carcases, 8 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	5	291	66
eel	4	96	22
grayling	1	8	2
minnow	53	19	4
stone loach	5	18	4
salmon	1	4	<1
gudgeon	1	4	<1
invertebrates	6	2	<1
3-sp. stickleback	1	1	<1
totals	77	443

d) March/April 1995.

13 carcases, 12 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	21	478	43
salmon	24	162	15
stone loach	28	137	12
eel	3	94	9
grayling	2	91	8
minnow	44	74	7
3-sp. stickleback	41	31	3
gudgeon	1	27	2
flounder	1	4	<1
totals	14	1102

(2) RIVER AWE, INVERAWE

a) March/April 1991.

4 carcases contained:

3 salmon (61g) and 1 trout (2.4g).

(3) RIVER BEAULY

a) March/April 1991.

9 carcases, 6 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	15	123	37
minnow	2	2	<1
salmon	25	212	63
totals	42	336

b) March/April 1992.

3 carcases contained:

9 salmon (83g) and 4 trout (64g).

c) "spring" 1995.

5 carcases, 5 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
salmon	20	181	58
trout	6	124	42
totals	26	305

(4) RIVER BERVIE

a) March 1992.

1 carcase contained:

5 trout (236g) and 1 minnow (1.4g).

b) February 1995.

1 carcase contained:

5 trout (118g) and 2 salmon (25g).

(5) RIVER BLACKWATER

a) February/March 1995.

5 carcases, 5 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
pike	4	202	62
salmon	5	57	17
carrion*	2	40	12
trout	2	24	7
minnow	2	5	2
totals	15	328

* head of large salmonid.

(6) RIVER BORDERS ESK

a) March 1992 (upstream of Canonbie).

13 carcases, 12 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	48	658	51
salmon	22	140	11
frog	5	185	15
minnow	57	87	7
stone loach	4	70	6
eel	2	66	5
river lamprey	2	67	5
invertebrates	2	<1	<1
totals	142	1274

b) April 1992 (upstream of Canonbie).

19 carcases, 17 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
river lamprey	14	368	30
trout	37	279	23
salmon	40	271	23
stone loach	13	123	10
minnow	53	83	7
frog	1	42	3
dace	1	39	3
3-sp. stickleback	3	2	<1
invertebrates	4	<1	<1
totals	166	1210

c) March 1993.

12 carcases, 12 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	29	501	82
eel	2	55	9
minnow	36	41	7
salmon	4	9	1
3-sp. stickleback	7	4	1
stone loach	1	2	<1
totals	79	612

d) April 1993.

11 carcases, 11 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	56	385	53
river lamprey	6	198	27
salmon	19	76	10
carrion*	2	40	6
stone loach	8	17	2
eel	1	9	1
minnow	3	5	1
totals	95	733

*salmon head and vole.

e) April 1994.

28 carcases, 25 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	60	589	39
river lamprey	18	576	38
minnow	86	134	9
eel	2	59	4
salmon	10	61	4
stone loach	14	64	4
frog	1	37	2
invertebrates	4	1	<1
3-sp. stickleback	2	<1	<1
totals	197	1523

f) April 1995.

27 carcases, 25 with stomach contents.

fish species	No fish	estimated wt (g)	% by mass
trout	47	709	50
salmon	40	390	27
eel	6	123	9
stone loach	16	80	6
river lamprey	2	68	5
minnow	24	48	3
chub	1	8	<1
3-sp. stickleback	5	2	<1
totals	141	1428