silk snapper - analysis of size-frequency todd gedamke (sefsc) photo from:
TRANSCRIPT
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Silk Snapper - Analysis of size-frequency
Todd Gedamke (SEFSC)Photo from: www.incognitolighttackle.com/photos.htm
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Age
Freq
uenc
y
F = 0.2
F = 0.4
More Fishing Less Older/Larger Fish
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5 assumptions:
1. Asymptotic growth, K and L known & constant
over time.
2. No individual variability in growth.
3. Constant & continuous recruitment over time.
4. Mortality constant with age.
5. Mortality constant over time Population in
equilibrium (mean length reflects mortality)
Beverton-Holt mean length mortality estimator
cLL
LLKZ
)(
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Age
Freq
uenc
yMore Fishing Less Older/Larger Fish
Age 1
Age 2Age 3
Age 0
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Silk Snapper – Hook and Line – Code 610 – Puerto Rico
Silk Snapper – Traps – Code 345 – Puerto Rico
From SEDAR meeting
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Silk Snapper – Hook and Line – Code 610 – Puerto Rico
Silk Snapper – Traps – Code 345 – Puerto Rico
From SEDAR meeting
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1
3627
3390
243
42
194
1175 284342 112
1745
60
96
4044
39 16
973
26
35
150
200
250
300
350
400
1982 1985 1988 1991 1994 1997 2000 2003 2006 2009
Mea
n L
eng
th
BlackfinSilk
Vermillion
Multi-gear Analysis – Traps and Hook/Line
Silk
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1
3627
3390
243
42
194
1175 284342 112
1745
60
96
4044
39 16
973
26
35
150
200
250
300
350
400
1982 1985 1988 1991 1994 1997 2000 2003 2006 2009
Mea
n L
eng
th
BlackfinSilk
Vermillion
Multi-gear Analysis – Traps and Hook/Line
Silk
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Detailed inspection of size composition over
time(spawning period, minimum size regulation)
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All silk snapper measured in Puerto Rico trap fishery
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1983 - 1988
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1989 - 1993
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1994 - 1998
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1999 - 2003
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2004 - 2008
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Same signal found in all gear/area
scenarios
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1983-2003
2004-2008
Traps – All Island
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1983-2003
2004-2008
Hook and Line – No WNW
Note: dip before min size
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1983-2003
2004-2008
Hook and Line –WNW only
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Size-Composition relatively constant
1983-2004
Selection of Lc
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Silk Snapper - Traps and Hook and Line - All Puerto Rico
0
2
4
6
8
10
12
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520Length (mm; 10 cm bins)
% o
f obs
erva
tions
1983-1987
1988-1992
1993-1997
1998-2002
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Silk Snapper - Traps and Hook and Line - All Puerto Rico
0
2
4
6
8
10
12
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520Length (mm; 10 cm bins)
% o
f obs
erva
tions
1983-1987
1988-1992
1993-1997
1998-2002
1983 - 1987
1988 - 1992
1993 - 1997 1998 -
2002
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Silk Snapper - Traps and Hook and Line - All Puerto Rico
0
2
4
6
8
10
12
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520Length (mm; 10 cm bins)
% o
f ob
serv
atio
ns
1983-1987
1988-1992
1993-1997
1998-2002
2003-2008
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Silk Snapper - Traps and Hook and Line - All Puerto Rico
0
2
4
6
8
10
12
120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500 520Length (mm; 10 cm bins)
% o
f ob
serv
atio
ns
1983-1987
1988-1992
1993-1997
1998-2002
2003-2008
Lc = 420
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1983-2003
2004-2008
Hook and Line – WNW Only Minimum Size of 420 mm
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1983-2003
Hook and Line – WNW Only Minimum Size of 420 mm
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Hook and Line + TrapsAll Island
Minimum Size of 420 mm
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Applying Gedamke and Hoenig Method
(Detecting changes in Mortality)
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Traps and Hook and Line - Lc = 420 mm - All Puerto Rico
27
120
236
187
248
210127
55
31
31
2
1
1
1
16
31
6
41
18
3
1
3
300
350
400
450
500
550
600
1980 1985 1990 1995 2000 2005 2010Year
Mea
n L
eng
th (
mm
)
-120
0
120
240
360
Res
idu
als
Predicted
Observed
Residuals0.15 --> 0.49
K=0.09, Linf = 730
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Traps and Hook and Line - Lc = 420 mm - All Puerto Rico
27
120
236
187
248
210127
55
31
31
2
1
1
1
16
31
6
41
18
3
1
3
300
350
400
450
500
550
600
1980 1985 1990 1995 2000 2005 2010Year
Mea
n L
eng
th (
mm
)
-120
0
120
240
360
Res
idu
als
Predicted
Observed
Residuals0.15 --> 0.49
K=0.09, Linf = 730
Not Significant
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Traps – All Puerto Rico – Lc = 420
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Hook and Line – WNW Only – Lc = 420
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Hook and Line – No WNW – Lc= 420
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Hook and Line and Traps - All PR – Lc = 420
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Traps and Hook and Line - Lc = 420 mm - All Puerto Rico
27
120
236
187
248
210127
55
31
31
2
1
1
1
16
31
6
41
18
3
1
3
300
350
400
450
500
550
600
1980 1985 1990 1995 2000 2005 2010Year
Mea
n L
eng
th (
mm
)
-120
0
120
240
360
Res
idu
als
Predicted
Observed
Residuals0.15 --> 0.49
K=0.09, Linf = 730
Equilibrium Mortality EstimateLast 5 years – Lc = 420
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Beverton Holt Mortality RateLc of 420 mm
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
3.00
3.20
430 435 440 445 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550
Mean Length (mm)
To
tal M
ort
alit
y (
Z)
Linf = 730, K = 0.09
Linf = 757, K = 0.1
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Beverton Holt Mortality RateLc of 420 mm
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
3.00
3.20
430 435 440 445 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550
Mean Length (mm)
To
tal M
ort
alit
y (
Z)
Linf = 730, K = 0.09
Linf = 757, K = 0.1
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Pauly Chen & Jensen Jensen Ault 2008Hoenig (water temp) Watanabe (tmat) (K) (Age Max)
(max. age 20) (26.5 C) (adult M) (8 yrs) (0.1) (9 yrs)
0.21 0.16 0.16 0.21 0.15 0.33
Natural Mortality EstimatesResults similar for available growth parameters (Linf = 730, K= 0.09 and Linf = 757, K = 0.1)
Mean of 0.2 yr-1
M = K of 0.1 used as lower bound
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Beverton Holt Mortality RateLc of 420 mm
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
3.00
3.20
430 435 440 445 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550
Mean Length (mm)
To
tal M
ort
alit
y (
Z)
Linf = 730, K = 0.09
Linf = 757, K = 0.1
Assuming Fmsy = M
Overfishing Line if M = 0.33
Using M = 0.2
Using M = K = 0.1
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Beverton Holt Mortality RateLc of 420 mm
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
3.00
3.20
430 435 440 445 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550
Mean Length (mm)
To
tal M
ort
alit
y (
Z)
Linf = 730, K = 0.09
Linf = 757, K = 0.1
Mean Length Range indicating Overfishing
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Mean of M=0.2
Mean lengths over time - Lc = 420 – Hook/Line and Traps
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Range given estimates of M
Mean lengths over time - Lc = 420 – Hook/Line and Traps
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MeanGEAR1 GEAR2 AREA N lc Length uclm lclm K Linf BH - Z uclm bh-z lclm bhz
Hook and Line NO_WNW 308 420 465 472 458 0.09 730 0.53 0.45 0.65
Hook and Line NO_WNW 308 420 465 472 458 0.1 757 0.65 0.55 0.79
Hook and Line WNW 510 420 465 470 460 0.09 730 0.53 0.47 0.61
Hook and Line WNW 510 420 465 470 460 0.1 757 0.65 0.57 0.75
Hook and Line Traps ALL PR 904 420 464 468 460 0.09 730 0.54 0.49 0.60
Hook and Line Traps ALL PR 904 420 464 468 460 0.1 757 0.66 0.60 0.73
Traps ALL PR 86 420 460 471 449 0.09 730 0.61 0.46 0.89
Traps ALL PR 86 420 460 471 449 0.1 757 0.75 0.56 1.08
Hook and Line OnlyRange of Z estimates from Mean Length = 0.53 0.66
Range from Confidence intervals = 0.45 0.79
Results of Base Case Scenario (Lc = 420)Mean Lengths Generated from all measured fish >= 2004
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Sensitivity Analysis (selection of Lc, growth parameters, and
uncertainty in Mean Lengths (95% CI’s used)
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All Scenario's investigated - (Lc = 400, 410, 420, 430)
Trap- All Island; Hook and Line- WNW, Not-WNW; Hook and Line and Trap - all islandLinf=757, K=0.1
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
390 400 410 420 430 440
Length at First Capture (Lc)
Tot
al M
orta
lity
(Z)
d
mean values
UCLM's
LCLM's
Overfishing Z assuming M = K and Fmsy = M
Overfishing Z assuming M =
0.33
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All Scenario's investigated - (Lc = 400, 410, 420, 430)Trap- All Island; Hook and Line- WNW, Not-WNW; Hook and Line and Trap - all island
Linf=730, K=0.09
0.10
0.20
0.30
0.40
0.50
0.60
0.70
0.80
0.90
1.00
390 400 410 420 430 440
Length at First Capture (Lc)
To
tal M
ort
alit
y (Z
) d
mean values
UCLM's
LCLM's
Overfishing Z assuming M = K and Fmsy = M
Overfishing Z assuming M =
0.33
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Conclusions
• Change in size-composition of TIP data resulted from the minimum
size regulation. Most fish (>90%) were still below the 16” min size and
could not be used in length based time series analysis (i.e. lower
sample sizes for entire time series)
- Note: effect of management measures on fishery-dependent
data
- Minimum size regulation not appropriate for this fishery
- DNER move to a closed season is likely to be more effective
• The size-composition appears to have changed little from 1983 to 2002,
implying that this historic level of F might not had a significant impact
on the stock and may have been sustainable.
• The revised analyses suggests that the current F is higher than the
F=M proxy for Fmsy, however lower sample sizes results in considerable
uncertainty and inability to provide a defensible current status
determination or Fcur/Fmsy scalar.
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Conclusions
• Change in size-composition of TIP data resulted from the minimum
size regulation. Most fish (>90%) were still below the 16” min size and
could not be used in length based time series analysis (i.e. lower
sample sizes for entire time series)
- Note: effect of management measures on fishery-dependent
data
- Minimum size regulation not appropriate for this fishery
- DNER move to a closed season is likely to be more effective
• The size-composition appears to have changed little from 1983 to 2002,
implying that this historic level of F might not had a significant impact
on the stock and may have been sustainable.
• The revised analyses suggests that the current F is higher than the
F=M proxy for Fmsy, however lower sample sizes results in considerable
uncertainty and inability to provide a defensible current status
determination or Fcur/Fmsy scalar.
![Page 49: Silk Snapper - Analysis of size-frequency Todd Gedamke (SEFSC) Photo from:](https://reader033.vdocuments.us/reader033/viewer/2022061305/5513f3bd55034674748b5d62/html5/thumbnails/49.jpg)
Conclusions
• Change in size-composition of TIP data resulted from the minimum
size regulation. Most fish (>90%) were still below the 16” min size and
could not be used in length based time series analysis (i.e. lower
sample sizes for entire time series)
- Note: effect of management measures on fishery-dependent
data
- Minimum size regulation not appropriate for this fishery
- DNER move to a closed season is likely to be more effective
• The size-composition appears to have changed little from 1983 to 2002,
implying that this historic level of F might not had a significant impact
on the stock and may have been sustainable.
• The revised analyses suggests that the current F is higher than the
F=M proxy for Fmsy, however lower sample sizes results in considerable
uncertainty and inability to provide a defensible current status
determination or Fcur/Fmsy scalar.
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