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Report on Sea Lice Epidemiology and Management in Ireland with Particular Reference to Potential Interactions with Wild Salmon (Salmo salar) and Freshwater Pearl Mussel (Margaritifera margaritifera) Populations
Dave Jackson
Pauline O’Donohoe
Tom McDermott
Frank Kane
Suzanne Kelly
Alan Drumm
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Surplus available for exploitation Bundorragha
1 SW Surplus available for exploitation Newport
Surplus available for exploitation Ballynahinch
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0.0
0.5
1.0
1.5
2.0
2.5
3.0
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Mean Ovigerous sea lice levels nationally (May)
Treatment trigger Level
Mean ovigerous sea lice (SE)
0
2
4
6
8
10
12
14
16
1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
Mean Mobile sea lice levels nationally (May) Mean mobile sea lice (SE)
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0
200
400
600
800
1000
1200
Burr01
Burr02
Burr03
Burr04
Burr05
Burr06 i
Burr06 ii
Burr07
Burr08 i
Burr08 ii
Batch / year
Ret
urns
(n)
SLICE Treatment Returns Control Returns X̂ 2 Signifcant difference
0
2
4
6
8
10
12
2001
2002
2003
2004
2005
2006i
2006ii
2007
2008i
2008ii
% S
urvi
val
Year
SLICE Treatment
Control
0
2
4
6
8
10
12
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
Year
% S
urvi
val
Control
SLICE Treatment
Control mean
SLICE Treatmentmean
Linear (Control)
Linear (SLICETreatment)
0
2
4
6
8
10
12
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
Year
% S
urvi
val
PredicetdControl
PredicetdSLICETreatment
Linear(PredicetdSLICETreatment)
Linear(PredicetdControl)
0
2
4
6
8
10
12
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
Year
% S
urvi
val
Common
Linear(Common)
0
10
20
30
40
50
60
70
80
90
100
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
% M
arin
e M
ort
ality
Year
Control
Slice
80
85
90
95
100
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
% M
arin
e M
orta
lity
YearControl SliceRegression y = -19.131 + 0.003 * x r2 = 0.3198 Regression y = -34.522 + 0.003 * x r2 = 0.3754
+95% CL -95% CL+95% CL -95% CL
• • •
•
• • • • •
• •
•
Group Code Release Date MicroTag Code
Control / Treated Stock Hatchery Release River Estimated Number
ReleasedUnraised Raised
28/04/2003 24780 Control Cong Cong Gowla 4822 3 20 28/04/2003 24779 Slice Cong Cong Gowla 4955 35 226 07/04/2004 34793 Control Cong Cong Gowla 4699 22 91 07/04/2004 34792 Slice Cong Cong Gowla 4655 51 165 07/04/2005 44789 Control Cong Cong Gowla 4735 53 318 07/04/2005 44788 Slice Cong Cong Gowla 4583 54 306 29/04/2003 24782 Control Cong Cong Invermore 4594 9 38 29/04/2003 24781 Slice Cong Cong Invermore 4589 17 89 08/04/2003 34795 Control Cong Cong Invermore 4671 26 96 08/04/2004 34794 Slice Cong Cong Invermore 4653 37 105 08/04/2005 44787 Control Cong Cong Invermore 4750 17 111 08/04/2005 44786 Slice Cong Cong Invermore 4716 31 196 12/04/2004 34796 Control Cong Cong Erriff 4229 34 108 12/04/2004 34797 Slice Cong Cong Erriff 4325 44 102 04/04/2005 44784 Control Cong Cong Erriff 4689 2 8 04/04/2005 44785 Slice Cong Cong Erriff 4659 37 172
Total Tags Recovered
Group Code Release Date MicroTag Code
Control / Treated Stock Hatchery Release River Estimated Number
ReleasedUnraised Raised
02/05/2001 44713 Control Burrishoole Delphi Bundorragha 6385 372 985 02/05/2001 44714 Slice Burrishoole Delphi Bundorragha 6392 423 1217 02/05/2001 44723 Control Delphi grilse Delphi Bundorragha 6395 303 892 02/05/2001 44724 Slice Delphi grilse Delphi Bundorragha 6368 285 836 26/04/2005 44790 Control Burrishoole Delphi Bundorragha 8893 543 26/04/2005 44791 Slice Burrishoole Delphi Bundorragha 8471 609 29/04/2006 54708 Control Burrishoole Delphi Bundorragha 8788 142 29/04/2006 54713 Slice Burrishoole Delphi Bundorragha 10560 414 26/04/2007 54721 Control Burrishoole Delphi Bundorragha 9719 534 27/04/2007 54722 Slice Burrishoole Delphi Bundorragha 9451 526 Delphi 08 DEL 28/04/2008 54740 Control Delphi grilse Delphi Bundorragha 10811 175 183Delphi 08 DEL 28/04/2008 54749 Slice Delphi grilse Delphi Bundorragha 10551 160 167Delphi 08 DEL 28/04/2008 54750 Slice Delphi grilse Delphi Bundorragha 5795 119 126 03/05/2001 204713 A Control Burrishoole Burrishoole Burrishoole 10039 416 03/05/2001 204701 A Slice Burrishoole Burrishoole Burrishoole 5496 259 565 01/05/2002 34705 A Control Burrishoole Burrishoole Burrishoole 3079 160 287 01/05/2002 34706 A Control Burrishoole Burrishoole Burrishoole 1596 77 138 01/05/2002 184747 B control Burrishoole Burrishoole Burrishoole 1314 58 117 01/05/2002 184761 B Slice Burrishoole Burrishoole Burrishoole 4748 248 456 01/05/2002 34707 A Slice Burrishoole Burrishoole Burrishoole 1212 55 89 01/05/2003 24774 Control Burrishoole Burrishoole Burrishoole 4587 126 374 01/05/2003 24777 Slice Burrishoole Burrishoole Burrishoole 4745 145 471 29/04/2004 44764 Control Burrishoole Burrishoole Burrishoole 4369 151 398 29/04/2004 34788 Slice Burrishoole Burrishoole Burrishoole 4437 162 403 28/04/2005 54702 A Control Burrishoole Burrishoole Burrishoole 3867 96 183 28/04/2005 44724 A Slice Burrishoole Burrishoole Burrishoole 3793 114 253 26/04/2006 14782 A Control Burrishoole Burrishoole Burrishoole 4299 180 180 26/04/2006 14764 A Control Burrishoole Burrishoole Burrishoole 480 31 31 26/04/2006 24782 A Slice Burrishoole Burrishoole Burrishoole 4809 326 326 04/05/2006 24791 A Control Burrishoole Burrishoole Burrishoole 8000 334 334 04/05/2006 24783 A Slice Burrishoole Burrishoole Burrishoole 3907 180 180 24/04/2007 44764a Control Burrishoole Burrishoole Burrishoole 3391 229 229 24/04/2007 34792a Control Burrishoole Burrishoole Burrishoole 3393 211 211 24/04/2007 34798a Slice Burrishoole Burrishoole Burrishoole 6746 491 491 29/04/2008 34777a Control Burrishoole Burrishoole Burrishoole 6832 76 76 29/04/2008 54741 Slice Burrishoole Burrishoole Burrishoole 6719 97 97 06/05/2008 14781a Control Burrishoole Burrishoole Burrishoole 3392 54 54 06/05/2008 24767a Slice Burrishoole Burrishoole Burrishoole 3413 72 72Burr 09 28/04/2009 54754 Control Burrishoole Burrishoole Burrishoole 6640 300 300Burr 09 28/04/2009 54755 Slice Burrishoole Burrishoole Burrishoole 6881 267 267 04/04/2006 24779 A Control Lee Carrigadrohid Lee 5131 10 10 04/04/2006 24780 A Slice Lee Carrigadrohid Lee 5207 10 10 28/04/2006 54707 Control Screebe Screebe Screebe 9618 121 121 28/04/2006 54716 Slice Screebe Screebe Screebe 10990 157 157 04/05/2006 54715 Control Erne Ballyshannon Erne 10357 68 68 04/05/2006 54714 Slice Erne Ballyshannon Erne 5752 70 70
Total Tags Recovered
Rel
ease
Dat
eM
icro
Tag
Cod
eC
ontr
ol /
Trea
ted
Sto
ckH
atch
ery
Rel
ease
Riv
erE
stim
ated
N
umbe
r R
elea
sed
Don
egal
May
oG
al /
Lim
Ker
ryW
Cor
kS
Coa
stS
E C
oast
Oth
erN
Irl
Trap
Rod
sD
raft
Bro
odS
tray
Tota
l tag
s R
ecov
ered
un
rais
ed
28/0
4/20
0324
780
Con
trol
Con
gC
ong
Gow
la48
220
12
00
00
00
00
00
03
28/0
4/20
0324
779
Slic
eC
ong
Con
gG
owla
4955
36
241
00
00
00
00
01
3507
/04/
2004
3479
3C
ontro
lC
ong
Con
gG
owla
4699
04
100
00
00
00
30
32
2207
/04/
2004
3479
2S
lice
Con
gC
ong
Gow
la46
554
815
00
00
00
010
011
351
07/0
4/20
0544
789
Con
trol
Con
gC
ong
Gow
la47
352
530
00
00
00
110
00
553
07/0
4/20
0544
788
Slic
eC
ong
Con
gG
owla
4583
26
260
00
00
08
00
012
5429
/04/
2003
2478
2C
ontro
lC
ong
Con
gIn
verm
ore
4594
41
30
00
00
00
00
10
929
/04/
2003
2478
1S
lice
Con
gC
ong
Inve
rmor
e45
892
48
00
00
00
00
00
317
08/0
4/20
0334
795
Con
trol
Con
gC
ong
Inve
rmor
e46
712
78
00
00
00
00
06
326
08/0
4/20
0434
794
Slic
eC
ong
Con
gIn
verm
ore
4653
65
71
00
00
00
00
144
3708
/04/
2005
4478
7C
ontro
lC
ong
Con
gIn
verm
ore
4750
12
100
00
00
01
00
03
1708
/04/
2005
4478
6S
lice
Con
gC
ong
Inve
rmor
e47
160
218
21
00
00
00
00
831
12/0
4/20
0434
796
Con
trol
Con
gC
ong
Err
iff42
294
57
01
00
00
02
012
334
12/0
4/20
0434
797
Slic
eC
ong
Con
gE
rriff
4325
1610
20
00
00
00
10
123
4404
/04/
2005
4478
4C
ontro
lC
ong
Con
gE
rriff
4689
00
10
00
00
01
00
00
204
/04/
2005
4478
5S
lice
Con
gC
ong
Err
iff46
590
412
11
00
00
135
00
137
02/0
5/20
0144
713
Con
trol
Bur
risho
ole
Del
phi
Bun
dorr
agha
6385
1185
109
12
00
00
037
012
52
372
02/0
5/20
0144
714
Slic
eB
urris
hool
eD
elph
iB
undo
rrag
ha63
9215
103
146
13
00
10
047
010
61
423
02/0
5/20
0144
723
Con
trol
Del
phi g
rilse
Del
phi
Bun
dorr
agha
6395
1370
120
30
00
10
09
087
030
302
/05/
2001
4472
4S
lice
Del
phi g
rilse
Del
phi
Bun
dorr
agha
6368
1171
104
31
00
00
010
084
128
526
/04/
2005
4479
0C
ontro
lB
urris
hool
eD
elph
iB
undo
rrag
ha88
931
249
00
00
00
015
80
296
3754
326
/04/
2005
4479
1S
lice
Bur
risho
ole
Del
phi
Bun
dorr
agha
8471
34
680
00
00
00
171
031
845
609
29/0
4/20
0654
708
Con
trol
Bur
risho
ole
Del
phi
Bun
dorr
agha
8788
00
110
00
00
00
420
863
142
29/0
4/20
0654
713
Slic
eB
urris
hool
eD
elph
iB
undo
rrag
ha10
560
00
250
00
00
00
114
026
510
414
26/0
4/20
0754
721
Con
trol
Bur
risho
ole
Del
phi
Bun
dorr
agha
9719
00
560
00
00
00
113
036
14
534
27/0
4/2
007
5472
2S
lice
Bur
risho
ole
Del
phi
Bun
dorr
agha
9451
00
410
00
00
00
137
034
17
526
28/0
4/20
0854
740
Con
trol
Del
phi g
rilse
Del
phi
Bun
dorr
agha
1081
10
06
00
00
00
138
290
02
175
28/0
4/20
0854
749
Slic
eD
elph
i gril
seD
elph
iB
undo
rrag
ha10
551
00
60
00
00
013
89
00
716
028
/04/
2008
5475
0S
lice
Del
phi g
rilse
Del
phi
Bun
dorr
agha
5795
00
80
00
00
093
150
03
119
03/0
5/20
0120
4713
AC
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e10
039
1182
6210
112
01
015
02
080
541
603
/05/
2001
2047
01 A
Slic
eB
urris
hool
eB
urris
hool
eB
urris
hool
e54
969
4729
46
10
10
983
061
025
901
/05/
2002
3470
5 A
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
3079
932
231
00
00
123
00
692
160
01/0
5/20
0234
706
AC
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e15
964
106
11
00
00
171
037
077
01/0
5/20
0218
4747
Bco
ntro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e13
141
164
01
00
00
80
028
058
01/0
5/20
0218
4761
BS
lice
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
4748
1166
321
00
00
033
00
105
024
801
/05/
2002
3470
7 A
Slic
eB
urris
hool
eB
urris
hool
eB
urris
hool
e12
123
105
00
00
00
70
030
055
01/0
5/20
0324
774
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
4587
1011
241
20
00
011
120
550
126
01/0
5/20
0324
777
Slic
eB
urris
hool
eB
urris
hool
eB
urris
hool
e47
4513
1826
34
00
10
1811
051
014
529
/04/
2004
4476
4C
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e43
6912
2716
18
00
00
482
037
015
129
/04/
2004
3478
8S
lice
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
4437
1432
113
60
01
143
80
421
162
28/0
4/20
0554
702
AC
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e38
672
60
00
00
00
3810
039
196
28/0
4/20
0544
724
AS
lice
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
3793
07
50
10
00
041
80
520
114
26/0
4/20
0614
782
AC
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e42
990
00
00
00
00
7513
092
018
026
/04/
2006
1476
4 A
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
480
00
00
00
00
013
30
150
3126
/04/
2006
2478
2 A
Slic
eB
urris
hool
eB
urris
hool
eB
urris
hool
e48
090
00
00
00
00
137
340
155
032
604
/05/
2006
2479
1 A
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
8000
00
00
00
00
014
220
017
11
334
04/0
5/20
0624
783
AS
lice
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
3907
00
00
00
00
068
130
990
180
24/0
4/20
0744
764a
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
3391
00
10
00
00
022
70
00
122
924
/04/
2007
3479
2aC
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e33
930
00
00
00
00
209
00
02
211
24/0
4/20
0734
798a
Slic
eB
urris
hool
eB
urris
hool
eB
urris
hool
e67
460
00
00
00
00
491
00
00
491
29/0
4/20
0834
777a
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
6832
00
00
00
00
076
00
00
7629
/04/
2008
5474
1S
lice
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
6719
00
00
00
00
097
00
00
9706
/05/
2008
1478
1aC
ontro
lB
urris
hool
eB
urris
hool
eB
urris
hool
e33
920
00
00
00
00
540
00
054
06/0
5/20
0824
767a
Slic
eB
urris
hool
eB
urris
hool
eB
urris
hool
e34
130
00
00
00
00
720
00
072
28/0
4/20
0954
754
Con
trol
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
6640
00
10
00
00
029
80
00
130
028
/04/
2009
5475
5S
lice
Bur
risho
ole
Bur
risho
ole
Bur
risho
ole
6881
00
10
00
00
026
60
00
026
704
/04/
2006
2477
9 A
Con
trol
Lee
Car
rigad
rohi
dLe
e 51
310
00
00
00
00
00
010
010
04/0
4/20
0624
780
AS
lice
Lee
Car
rigad
rohi
dLe
e 52
070
00
00
00
00
00
010
010
28/0
4/20
0654
707
Con
trol
Scr
eebe
Scr
eebe
Scr
eebe
9618
00
00
00
00
03
180
100
012
128
/04/
2006
5471
6S
lice
Scr
eebe
Scr
eebe
Scr
eebe
1099
00
00
00
00
01
020
013
60
157
04/0
5/20
0654
715
Con
trol
Ern
eB
ally
shan
non
Ern
e10
357
00
00
00
00
10
00
670
6804
/05/
2006
5471
4S
lice
Ern
eB
ally
shan
non
Ern
e57
520
00
00
00
00
00
070
070
�
Year Mean ovigerous L. salmonis per
fish
Standard Error
Mean mobile L. salmonis
per fish
Standard Error
1991 1.21 0.44 10.19 2.741992 2.34 0.34 12.15 1.781993 1.50 0.23 9.87 1.311994 0.53 0.10 4.61 0.661995 0.53 0.11 4.39 0.721996 1.01 0.24 11.56 1.841997 1.17 0.21 7.27 1.211998 1.30 0.23 8.97 1.551999 0.89 0.14 7.86 1.182000 0.68 0.13 3.91 0.712001 0.21 0.04 1.10 0.212002 0.73 0.12 4.26 0.742003 0.73 0.13 4.84 0.942004 0.58 0.13 2.28 0.512005 1.07 0.25 5.12 1.342006 1.39 0.29 8.65 1.932007 1.74 0.32 12.35 2.212008 0.68 0.16 8.81 2.992009 0.77 0.12 7.42 1.492010 0.72 0.16 5.11 0.982011 0.35 0.10 1.51 0.372012 0.45 0.08 2.84 0.582013 0.19 0.04 0.89 0.17
43 3
Report on Sea Lice Epidemiology and Management in Ireland with Particular Reference to Potential Interactions with Wild Salmon (Salmo salar) and Freshwater Pearl Mussel (Margaritifera margaritifera) Populations
Dave Jackson
Pauline O’Donohoe
Tom McDermott
Frank Kane
Suzanne Kelly
Alan Drumm
