Status of Lake Trout ( Salvelinus namaycush )
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Status of Lake Trout(Salvelinus namaycush)
in Georgian Bay and North Channel
Lloyd C. Mohr
Upper Great Lakes Management Unit,
Lake Huron Office, OMNR
Owen Sound, ON
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Background
Statistical Districts in Cdn Waters
Data Sources: - Commercial Harvest - Commercial Catch Sampling - Index Assessment Surveys - Recreational Surveys
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LakeTrout Rehabilitation
1996 Rehab Plan
7 Active Rehab Zones
2 Proposed Sanctuaries
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LakeTrout Rehabilitation
Objectives
Spawning Populations 2005
Natural Reproduction 2010
Self-Reproducing in Former Range 2020Annual sustained yield 1.12 million kg
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LakeTrout Sources
• Iroquois Bay• Parry Sound
Remnant Stocks
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Lake Trout Sources
11 sites• Average 850K G.Bay• 110K N. Channel• 1991 30% Backcross G. Bay• 1996 Pure Lake Trout
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
1979 1982 1985 1988 1991 1994 1997Year
Nu
mb
er S
tock
ed x
10
6 North ChannelGeorgian BayLake Huron
Stocking
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Lake Trout SourcesMovement (CWT)
GB09 97.6GB08 2.4
GB10 56.5GB11 14.5GB08 14.2GB09 9.5
GB03 40.4LH03 20.1LH04 27.4GB10 8.8
%
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LakeTrout Exploitation - Commercial
0
500
1000
1500
2000
2500
3000
3500
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
Year
Ha
rve
st
(kg
x 1
00
0)
U.S. HURON GEO BAY N.CHAN
Prior to 1922, Canadian Harvest combined for all 3 Basins
Annual Harvest
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0
20
40
60
80
100
120
140
160
180
200
1970 1974 1978 1982 1986 1990 1994 1998 Year
Har
vest
(kg
x 1
000)
0
500
1000
1500
2000
2500
Fis
h S
tock
ed (
# x1
000)
N.CHAN
GEO BAY
HURON
Number Stocked
LakeTrout Exploitation - CommercialAnnual Harvest
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0
20,000
40,000
60,000
80,000
100,000
120,000
1979 1983 1987 1991 1995 1999
Year
Ha
rve
st
(kg
)
NC3
NC2
NC1
GB4
GB3
GB2
GB1
LakeTrout Exploitation - CommercialStatistical Districts
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LakeTrout Exploitation - CommercialIncidental Catch
0
20
40
60
80
100
120
140
160
180
Georgian Bay North Channel Main Basin
Nu
mb
er F
ish
/ F
ish
ing
Eve
nt 1975-1979
1980-1990
1991-1999
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LakeTrout Exploitation - Commercial
95.7 92.1 87.8
2.9 <0.1 3.6
0.7 6.5 6.6
0.7 1.3 2.1
GB NC MBIncidental Catch (%)
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0.0
0.4
0.8
1.2
1.6
2.0
1 2 3 4 5 6 7 8 9 10 11 12Month
kg
Lt
/ k
g L
wf1990 1991 1992 1993
1994 1995 1996 1997
LakeTrout Exploitation - CommercialIncidental Catch (Seasonal)
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LakeTrout Exploitation - CommercialIncidental Catch (Spatial)
> 1,000 kg
250 - 1000
100 - 250
10 - 100
< 10
1979 1989
1999
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LakeTrout Exploitation - CommercialIncidental Catch (Spatial)
1999
> 1,000 kg
250 - 1000
100 - 250
10 - 100
< 10
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0
0.1
0.2
0.3
0.4
0.5
0.6
4.25 4.5 4.75 5 5.25 5.5Mesh size (in.)
Lak
e tr
ou
t /
Lak
e W
hit
efis
h 1992
1993
1994
1995
1996
1997
1998
1999
LakeTrout Exploitation - CommercialIncidental Catch (mesh size)
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LakeTrout Exploitation - SportSW Georgian Bay
0
5000
10000
15000
20000
25000
30000
1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
Year
Bio
mas
s (k
g) Georgian Bay
Main Basin
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LakeTrout Biological Data
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LakeTrout - (Mean Size)Mean Size of Lake Trout Harvested
Georgian Bay
0
500
1000
1500
2000
2500
3000
1989 1991 1993 1995 1997 1999Year
RW
T (
g)
0
100
200
300
400
500
600
FL
EN
(m
m)
RWT
FLEN
Mean Size of Lake Trout HarvestedNorth Channel
0
500
1000
1500
2000
2500
3000
1989 1991 1993 1995 1997 1999Year
RW
T (
g)
0
100
200
300
400
500
600
700
FL
EN
(m
m)
RWT
FLEN
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0
1
2
3
4
5
6
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
Year
Ag
e (y
r)
GB
NC
LakeTrout - (Mean Age)Known Age Fish only
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0.0
0.1
0.2
0.3
0.4
0.5
1 2 3 4 5 6 7 8 9 10
1989
1999
0.00.1
0.20.3
0.40.5
0.60.7
1 2 3 4 5 6 7 8 9 10 11 12 13
1989
1999Georgian Bay
North Channel
LakeTrout - (Age Distributions)
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0
100
200
300
400
500
600
700
800
1988 1990 1992 1994 1996 1998 2000
Year
Ave
rag
e F
LE
N (
mm
)
10
9
8
7
6
5
4
3
2
1
LakeTrout - (Size at Age)Known Age Fish only
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North Channel Lake Trout Maturity (Female) 1998-1999
y=exp(-13.80725+(2.628768)*x)/(1+exp(-13.80725+(2.628768)*x))
AGE
M
AT
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
0 1 2 3 4 5 6 7 8 9 10
North Channel50% - 5.3yr
Georgian Bay50% - 4.6 yr
Georgian Bay Lake Trout Maturity (Female) 1998-1999
y=exp(-11.21678+(2.455271)*x)/(1+exp(-11.21678+(2.455271)*x))
AGE
M
AT
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
0 1 2 3 4 5 6 7 8 9 10
LakeTrout - (Maturity Schedule)Females
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0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
3 4 5 6 7 8 9Age
Pro
po
rtio
n M
atu
re
1991
1992
1993
1994
1995
1996
1997
1998
SW Georgian Bay (females)
LakeTrout - (Maturity Schedule)
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0
20
40
60
80
100
1992 1994 1996 1998 2000Year
To
tal A
nn
ual
Mo
rtal
ity
(A)
LakeTrout - (Mortality)
SW Georgian Bay (Age 4+)
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LakeTrout - (Sea Lamprey Wounds)
0
10
20
30
40
50
1984 1986 1988 1990 1992 1994 1996 1998
Year
# W
ou
nd
s /
10
0 F
ish
NC
GB
MB
All Data Sources
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LakeTrout RehabilitationObjectives
Spawning Populations 2005
Self-Reproducing in Former Range 2020Annual sustained yield 1.12 million kg
Natural Reproduction 2010
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Evaluation
• Lake Trout Survival highly variable
• Spawning Stock Size• Egg Deposition• Natural Reproduction• Age Structure• Range• Abundance• Yield
under investigation
unknown
present 2-4 locations
constricted
expansion in P. Sound
CPUE variable
???
LakeTrout Rehabilitation
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LakeTrout Management
Exploitation Review •Commercial Quota and Recreational Limits
• Incidental Catch Rates
• Reporting / Assessment Issues
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LakeTrout Management
Lake Trout Rehabilitation Plan Review •summarize/evaluate data
• model results
• LTRP Benchmarks
• re-evaluate assessment protocol/requirements
• where are we?
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LakeTrout Management