yellowfin tuna 1975-2005
DESCRIPTION
Yellowfin Tuna 1975-2005. Major Changes. Catch, effort, and length-frequency data for the surface fisheries have been updated to include new data for 2005 and revised data for 1975-2004. - PowerPoint PPT PresentationTRANSCRIPT
Yellowfin Tuna 1975-2005
Major Changes• Catch, effort, and length-frequency data for the surface
fisheries have been updated to include new data for 2005 and revised data for 1975-2004.
• Catch data for the Japanese longline fisheries have been updated for 2000-2003 and to include new data for 2004.
• Catch data for the longline fisheries of Chinese Taipei have been updated for 2002 and new data added for 2003.
• Catch data fore the longline fisheries of Korea have been updated to include new data for 2003
• Catch data for the longline fisheries of the Peoples Republic of China have been updated to include new data for 2003 and 2004.
• Longline catch-at-length data for 2002-2003 have been updated and new data for 2004 added.
• Longline catch per unit effort data have been standardized using a delta-lognormal model, updated to include 2004 data.
• Growth model has been changed to fix length-at-age at the prior distribution of a Richards growth curve based on otolith data
Sensitivity Analyses
• Stock recruitment relationship• Asymptotic length
Data
• Fishery definitions• Catch• Effort• Length frequency
Yellowfin Fishery Definitions
40
30
20
10
0
10
20
30
40
150 140 130 120 110 100 90 80 70
10
40
30
20
10
0
10
20
30
40
150 140 130 120 110 100 90 80 70
11
12
6
5
40
30
20
10
0
10
20
30
40
150 140 130 120 110 100 90 80 70
40
30
20
10
0
10
20
30
40
150 140 130 120 110 100 90 80 70
1, 13
2, 143, 15
4, 16 7
9
8
40
30
20
10
0
10
20
30
40
150 140 130 120 110 100 90 80 70
Baitboat Unassociated Longline
DolphinFloating Objects
0
10000
20000
30000
40000
50000
60000Fishery -- Pesqueria 1
75 80 85 90 95 00 05
Fishery -- Pesqueria 2
75 80 85 90 95 00 05
Fishery -- Pesqueria 3
75 80 85 90 95 00 05
Fishery -- Pesqueria 4
75 80 85 90 95 00 05
0
10000
20000
30000
40000
50000
60000Fishery -- Pesqueria 5 Fishery -- Pesqueria 6 Fishery -- Pesqueria 7 Fishery -- Pesqueria 8
0
10000
20000
30000
40000
50000
60000Fishery -- Pesqueria 9 Fishery -- Pesqueria 10 Fishery -- Pesqueria 11 Fishery -- Pesqueria 12
0
10000
20000
30000
40000
50000
60000Fishery -- Pesqueria 13 Fishery -- Pesqueria 14 Fishery -- Pesqueria 15 Fishery -- Pesqueria 16
Year -- Año
Tons
-- T
onel
adasCatch
FO south FO central FO coastal FO north
DOL south
DOL coastalDOL northNA southNA north
LL southLL northBB
DIS south DIS northDIS coastalDIS central
0.0
0.5
1.0
1.5
Fishery -- Pesqueria 1
75 80 85 90 95 00 05
0.0
0.5
1.0
1.5
2.0
2.5
Fishery -- Pesqueria 2
75 80 85 90 95 00 05
1
2
3
4
Fishery -- Pesqueria 3
75 80 85 90 95 00 05
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Fishery -- Pesqueria 4
75 80 85 90 95 00 05
0
1
2
3
4
Fishery -- Pesqueria 5
0
1
2
3
4
5Fishery -- Pesqueria 6
0
1
2
3
Fishery -- Pesqueria 7
0.5
1.0
1.5
2.0
2.5
Fishery -- Pesqueria 8
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4Fishery -- Pesqueria 9
0
1
2
3
4
Fishery -- Pesqueria 10
0
5
10
15
Fishery -- Pesqueria 11
100
200
300
400
Fishery -- Pesqueria 12
0.0
0.5
1.0
1.5
Fishery -- Pesqueria 13
0.0
0.5
1.0
1.5
2.0
2.5
Fishery -- Pesqueria 14
1
2
3
4
Fishery -- Pesqueria 15
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Fishery -- Pesqueria 16
Year -- Año
Thou
sand
s of
day
s an
d hu
ndre
ds o
f tho
usan
ds o
f hoo
ksM
iles
de d
ias
y ci
ento
s de
mile
s de
anz
uelo
s
Effort
FO south
FO central
FO coastal
FO north
DOL south
DOL coastal
DOL northNA southNA north
LL southLL northBB
DIS south
DIS north
DIS coastal
DIS central
CPUE
FO south
FO central
FO coastal FO north
DOL south
DOL coastalDOL north
NA southNA north
LL southLL northBB
DIS south
DIS north
DIS coastal
DIS central
0
1
2
3
4
5
6Fishery -- Pesqueria 1
75 80 85 90 95 00 05
0123456
Fishery -- Pesqueria 2
75 80 85 90 95 00 05
0
1
2
3
4
5Fishery -- Pesqueria 3
75 80 85 90 95 00 05
0
1
2
3
Fishery -- Pesqueria 4
75 80 85 90 95 00 05
0.5
1.0
1.5
2.0
2.5
3.0Fishery -- Pesqueria 5
0.00.5
1.0
1.52.0
2.5
3.0
Fishery -- Pesqueria 6
0.5
1.0
1.5
2.0
2.5
Fishery -- Pesqueria 7
0.5
1.0
1.5
2.0
2.5Fishery -- Pesqueria 8
0.0
0.5
1.0
1.5
2.0
2.5
3.0Fishery -- Pesqueria 9
0.0
0.5
1.0
1.5
2.0
2.5
Fishery -- Pesqueria 10
0
1
2
3
4Fishery -- Pesqueria 11
0.5
1.0
1.5
2.0
2.5
3.0Fishery -- Pesqueria 12
0
1
2
3
4
5
6 Fishery -- Pesqueria 13
0
2
4
6
8
10
12Fishery -- Pesqueria 14
0
1
2
3
4
Fishery -- Pesqueria 15
0
1
2
3
4
5Fishery -- Pesqueria 16
Year -- Año
Sca
led
CP
UE
-- C
PU
E e
scal
ado
Fixed Parameters
•Natural Mortality
•Fecundity at age
•Sex ratio at age
•Selectivity curves for the discard fisheries
•The steepness of the stock recruitment relationship = 1 (no relationship)
Natural Mortality
Age in quarters -- Edad en trimestres
Qua
rterly
M --
M T
rimes
tral
0.0
0.1
0.2
0.3
0.4
0.5
4 8 12 16 20 24 28
Sex Ratio
Age in quarters
Per
cent
fem
ale
0 5 10 15 20 25
0.0
0.1
0.2
0.3
0.4
0.5
Relative Fecundity
Age in quarters
Rel
ativ
e fe
cund
ity x
mat
urity
0 5 10 15 20 25
01
23
45
6
Estimated parameters•Recruitment
•Temporal anomalies, (no Seasonal component)
•Catchability•Temporal anomalies
•Selectivity
•Initial population size and age-structure
•Mean length at age
•Variation of length at age
Results
• Fit to the length frequency• Growth• Fishing mortality• Selectivity• Recruitment• Biomass• Catchability
Fit to the length-frequency
FO south FO central FO coastal FO north
DOL south
DOL coastalDOL northNA southNA north
LL southLL northBB
0.0
0.01
0.02
0.03
0.04
Fishery -- Pesqueria 1
50 100 150 200
Fishery -- Pesqueria 2 Fishery -- Pesqueria 3
50 100 150 200
Fishery -- Pesqueria 4
Fishery -- Pesqueria 5 Fishery -- Pesqueria 6 Fishery -- Pesqueria 7
0.0
0.01
0.02
0.03
0.04
Fishery -- Pesqueria 80.0
0.01
0.02
0.03
0.04
Fishery -- Pesqueria 9 Fishery -- Pesqueria 10
50 100 150 200
Fishery -- Pesqueria 11 Fishery -- Pesqueria 12
50 100 150 200
Length (cm) Talla
Pro
port
ion
of th
e ca
tch
-- P
ropo
rció
n de
la c
aptu
ra
Growth
Age in quarters -- Edad en trimestres
0
50
100
150
200
Mea
n le
ngth
(cm
) Tal
la m
edia
4 8 12 16 20 24 28
Current assessment -- Evaluacion actualPrior
Fishing mortality
0.0
0.2
0.4
0.6
0.8
1.0
1.2Ages 2-5 -- Edades 2-5 Ages 6-9 -- Edades 6-9
0.0
0.2
0.4
0.6
0.8
1.0
1.2Ages 10-13 -- Edades 10-13 Ages 14-17 -- Edades 14-17
0.0
0.2
0.4
0.6
0.8
1.0
1.2Ages 18-21 -- Edades 18-21 Ages 22-25 -- Edades 22-25
0.0
0.2
0.4
0.6
0.8
1.0
1.2Ages 26-29 -- Edades 26-29
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
Year -- Año
Ave
rage
tota
l F --
Pro
med
io d
e F
tota
l
Age Specific Fishing Mortality
Age in quarters -- Edad en trimestres
5 10 15 20 25 30
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Ave
rage
tota
l F --
Pro
med
io d
e F
tota
l 1975 - 19921993 - 2005
0
2
4
6
Fishery -- Pesqueria 1
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 2
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 3
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 4
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 5
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 6
4 8 12 16 20 24 28
0
2
4
6
8
Fishery -- Pesqueria 7
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 8
4 8 12 16 20 24 28
0
1
2
3
4
5
6Fishery -- Pesqueria 9
4 8 12 16 20 24 28
0
2
4
6
8
10
12
14Fishery -- Pesqueria 10
4 8 12 16 20 24 28
0
1
2
3
4
5
Fishery -- Pesqueria 11
4 8 12 16 20 24 28
0
1
2
3
4
5
6Fishery -- Pesqueria 12
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 13
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 14
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 15
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 16
4 8 12 16 20 24 28
Age in quarters -- Edad en trimestres
Sel
ectiv
ity --
Sel
ectiv
idad
Selectivity
FO south
FO central
FO coastal
FO north
DOL south
DOLcoastal
DOL northNA south
NA north
LL south
LL north
BB
DIS south DIS northDIS coastalDIS central
0
2
4
6
Fishery -- Pesqueria 1
75 80 85 90 95 00 05
Fishery -- Pesqueria 2
75 80 85 90 95 00 05
Fishery -- Pesqueria 3
75 80 85 90 95 00 05
0
2
4
6
Fishery -- Pesqueria 4 Fishery -- Pesqueria 5 Fishery -- Pesqueria 60
2
4
6
Fishery -- Pesqueria 7 Fishery -- Pesqueria 8 Fishery -- Pesqueria 90
2
4
6
Fishery -- Pesqueria 10 Fishery -- Pesqueria 11 Fishery -- Pesqueria 12
Year -- Año
Cat
chab
ility
and
its
com
pone
nts
Cap
tura
bilid
ad y
sus
com
pone
ntes
Catchability
FO south FO central FO coastal
FO north
DOL southDOL coastalDOL north
NA southNA north
LL southLL northBB
Recruitment
Year -- Año
Rel
ativ
e re
crui
tmen
t -- R
eclu
tam
ient
o re
lativ
o
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
1
2
3
4
5
Recent length-frequency data (FO)
0.0
0.01
0.02
0.03
0.042004 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.04 2004 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.042004 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.04 2004 Quarter -- Trimestre 4
0.0
0.01
0.02
0.03
0.042005 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.04 2005 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.042005 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.04 2005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Pro
port
ion
of th
e ca
tch
-- P
ropo
rció
n de
la c
aptu
ra
0.0
0.01
0.02
0.03
0.042004 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.042004 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.042004 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.042004 Quarter -- Trimestre 4
0.0
0.01
0.02
0.03
0.042005 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.042005 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.042005 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.042005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Pro
port
ion
of th
e ca
tch
-- P
ropo
rció
n de
la c
aptu
ra
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 4
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Pro
port
ion
of th
e ca
tch
-- P
ropo
rció
n de
la c
aptu
ra
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.04
2004 Quarter -- Trimestre 4
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 1
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 2
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 3
0.0
0.01
0.02
0.03
0.04
2005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Pro
port
ion
of th
e ca
tch
-- P
ropo
rció
n de
la c
aptu
raFO south FO central FO coastal FO north
2 3 41
0.00.0050.0100.0150.0200.0250.030
2004 Quarter -- Trimestre 1
0.00.0050.0100.0150.0200.0250.030
2004 Quarter -- Trimestre 2
0.00.0050.0100.0150.0200.0250.030
2004 Quarter -- Trimestre 3
0.00.0050.0100.0150.0200.0250.030
2004 Quarter -- Trimestre 4
0.00.0050.0100.0150.0200.0250.030
2005 Quarter -- Trimestre 1
0.00.0050.0100.0150.0200.0250.030
2005 Quarter -- Trimestre 2
0.00.0050.0100.0150.0200.0250.030
2005 Quarter -- Trimestre 3
0.00.0050.0100.0150.0200.0250.030
2005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
0.00.0050.0100.0150.0200.025
2004 Quarter -- Trimestre 1
0.00.0050.0100.0150.0200.025
2004 Quarter -- Trimestre 2
0.00.0050.0100.0150.0200.025
2004 Quarter -- Trimestre 3
0.00.0050.0100.0150.0200.025
2004 Quarter -- Trimestre 4
0.00.0050.0100.0150.0200.025
2005 Quarter -- Trimestre 1
0.00.0050.0100.0150.0200.025
2005 Quarter -- Trimestre 2
0.00.0050.0100.0150.0200.025
2005 Quarter -- Trimestre 3
0.00.0050.0100.0150.0200.025
2005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
Recent length-frequency data (Unassociated)
NA southNA north
Recent length-frequency data (Dolphin associated)
DOL southDOL coastalDOL north
0.0
0.005
0.010
0.0152004 Quarter -- Trimestre 1
0.0
0.005
0.010
0.0152004 Quarter -- Trimestre 2
0.0
0.005
0.010
0.0152004 Quarter -- Trimestre 3
0.0
0.005
0.010
0.0152004 Quarter -- Trimestre 4
0.0
0.005
0.010
0.0152005 Quarter -- Trimestre 1
0.0
0.005
0.010
0.0152005 Quarter -- Trimestre 2
0.0
0.005
0.010
0.0152005 Quarter -- Trimestre 3
0.0
0.005
0.010
0.0152005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 4
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
0.0202004 Quarter -- Trimestre 4
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
0.0202005 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
Recent length-frequency data (longline)
LL southLL north
0.0
0.005
0.010
0.015
2003 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
2003 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
2003 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
2003 Quarter -- Trimestre 4
0.0
0.005
0.010
0.015
2004 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
2004 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
2004 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
2004 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
0.0
0.005
0.010
0.015
0.020
0.0252003 Quarter -- Trimestre 1
0.0
0.0050.010
0.015
0.020
0.025 2003 Quarter -- Trimestre 2
0.0
0.0050.010
0.015
0.020
0.0252003 Quarter -- Trimestre 3
0.0
0.005
0.010
0.015
0.020
0.025 2003 Quarter -- Trimestre 4
0.0
0.005
0.010
0.015
0.020
0.0252004 Quarter -- Trimestre 1
0.0
0.005
0.010
0.015
0.020
0.025 2004 Quarter -- Trimestre 2
0.0
0.005
0.010
0.015
0.020
0.0252004 Quarter -- Trimestre 3
0.0
0.005
0.010
0.0150.020
0.025 2004 Quarter -- Trimestre 4
50 100 150 200
Length (cm) Talla
Proportion of the catch -- Proporción de la captura
Environmental index
Rel
ativ
e re
crui
tmen
tR
eclu
tam
ient
o re
lativ
o
-0.010 -0.005 0.0 0.005 0.010
0
1
2
3
Relative spawning biomassBiomasa relativa de reproductores
Rel
ativ
e re
crui
tmen
tR
eclu
tam
ient
o re
lativ
o
0.0 0.2 0.4 0.6 0.8 1.0
0
1
2
3
Stock - recruitment
Biomass
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
200000
400000
600000
800000
Tons
-- T
onel
adas
Biomass of fish 1.5+ years old -- Biomasa de peces de 1.5+ años de edad
Spawning Biomass
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
2000
4000
6000
8000
10000
Fec
undi
ty in
dex
Fec
undi
dad
indi
cePopulation fecundity -- Fecundidad de la poblacion
Average weight
FO south FO central FO coastal FO north
DOL south
DOL coastalDOL northNA south
NA north
LL southLL north
BB
Surface
Longline
0
10
20
30
40
50
Fishery -- Pesqueria 1
75 80 85 90 95 00 05
Fishery -- Pesqueria 2 Fishery -- Pesqueria 3
75 80 85 90 95 00 05
Fishery -- Pesqueria 4 Fishery -- Pesqueria 5
75 80 85 90 95 00 05
Fishery -- Pesqueria 6 Fishery -- Pesqueria 7 Fishery -- Pesqueria 8 Fishery -- Pesqueria 9
0
10
20
30
40
50
Fishery -- Pesqueria 100
10
20
30
40
50
Fishery -- Pesqueria 11 Fishery -- Pesqueria 12 Fishery -- Pesqueria 13 Fishery -- Pesqueria 14 Fishery -- Pesqueria 15
Fishery -- Pesqueria 16 Fisheries -- Pesquerias 1-10
75 80 85 90 95 00 05
0
10
20
30
40
50
Fisheries -- Pesquerias 11-12
Year -- Año
Kilo
gram
s --
Kilo
gram
os
No Fishing
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
500
1000
1500
Thou
sand
s of
tons
--
Mile
s de
tone
lada
s
No fishing -- Sin pescaFishing -- Con pesca
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0.0
0.2
0.4
0.6
0.8
1.0
Dyn
amic
rat
io o
f fis
hed
to u
nfis
hed
biom
ass
-- L
a pr
opor
ción
din
ámic
a de
pes
cado
a u
nfis
hed
biom
asa
Fishery impact
Year
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0.0
0.2
0.4
0.6
0.8
1.0
Fish
ery
impa
ct
LonglineDolphinUnassociatedFloating objectsSmall discards
No Fishing and Fishery Impact
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
500
1000
1500
Thou
sand
s of
tons
--
Mile
s de
tone
lada
s
LonglineDolphinUnassociatedFloating objectsSmall discardsBiomass with fishingBiomass with no fishing
Biomass Comparisons
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
200000
400000
600000
800000
Tons
- To
nela
das
Year - Año
2006200520042003
Reference points & projections
• Assumptions– For MSY calculations
• Average of 2002-2003 for fishing mortality– For forward projections
• Average of 2002-2003 for catchability• 2004 effort
SBR
Year -- Año
0.0
0.2
0.4
0.6
0.8
1.0
Spa
wni
ng b
iom
ass
ratio
Coc
ient
e de
bio
mas
a re
prod
ucto
ra
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
SBRS
panw
ing
biom
ass
ratio
Coc
ient
e de
bio
mas
sa re
prod
ucto
ra
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0.0
0.2
0.4
0.6
0.8 2006200520042003
AMSY by method
Fishery AMSY BAMSY SAMSY BAMSY/BF=0 SAMSY/SF=0 F multiplier
Pesquería RMSP BRMSP SRMSP BRMSP/BF=0 SRMSP/SF=0
Multiplicador de F
All—Todos 287 519 416 379 4 677 0.36 0.37 1.02
OBJ 214 243 316 331 3 520 0.27 0.28 11.06
NOA 259 574 385 228 4 392 0.33 0.34 4.20
DEL 304 745 406 369 4 335 0.35 0.34 2.11
LL 350 562 460 673 4 961 0.39 0.39 25.18
AMSY with method removed
Fishery AMSY BAMSY SAMSY BAMSY/BF=0 SAMSY/SF=0 F multiplier
Pesquería RMSP BRMSP SRMSP BRMSP/BF=0 SRMSP/SF=0
Multiplicador de F
All—Todos 287 519 416 379 4 677 0.36 0.37 1.02
No FLT 295 231 416 062 4 607 0.36 0.36 1.20
No UNA 296 439 421 719 4 687 0.36 0.37 1.39
No DOL 268 587 419 120 4 894 0.36 0.38 2.08
No LL 282 176 406 755 4 549 0.35 0.36 1.12
AMSY with effort adjusted
Allgears
Purse-seine only
Longlineonly
Purse-seinescaled
Longlinescaled
Base
AMSY—RMSP 287 519 282 176 373 759 287 625 306 171
BAMSY—BRMSP 416 379 406 755 577 040 433 243 327 698
SAMSY—SRMSP 4 677 4 549 6 755 4 920 3 204
BAMSY/B0—BRMSP/B0 0.36 0.35 0.41 0.37 0.28
SAMSY/S0—SRMSP/S0 0.37 0.36 0.44 0.39 0.25
F multiplier—Multiplicador de F 1.02 1.12 12.41 0.94 19.62
Yield
Fishing mortality relative to current fishing mortalityMortalidad por pesca relativa a la mortalidad por pesca actual
0.0 0.5 1.0 1.5 2.0
0.0
0.2
0.4
0.6
0.8
1.0
Rel
ativ
e yi
eld
Ren
dim
ient
o re
lativ
o
Fishing mortality relative to current fishing mortalityMortalidad por pesca relativa a la mortalidad por pesca actual
0.0 0.5 1.0 1.5 2.0
0.0
0.2
0.4
0.6
0.8
1.0
Rel
ativ
e po
pula
tion
fecu
ndity
Fecu
ndid
ad re
lativ
a de
la p
obla
cion
AMSY quantities using F(y)
Year
Sm
sy/S
0
1975 1980 1985 1990 1995 2000 2005
0.0
0.1
0.2
0.3
0.4
Year
MS
Y
1975 1980 1985 1990 1995 2000 2005
0
50000
100000
150000
200000
250000
300000
Year
Scu
r/Sm
sy
1975 1980 1985 1990 1995 2000 2005
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
Year
Fsca
le
1975 1980 1985 1990 1995 2000 2005
0.0
0.5
1.0
1.5
2.0
Sensitivity: h = 0.75
• When the spawning population is 20% of its unexploited level the recruitment is 75% of its unexploited level
• Biomass• Recruitment• SBR• Yield Curve• AMSY
Biomass Comparison
Year -- Año
Tons
-- T
onel
adas
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
200000
400000
600000
800000
Basecase -- Caso baseSteepness -- Inclinacion = 0.75
Recruitment
Year -- Año
Rec
ruitm
ent (
Mill
ions
of f
ish)
Rec
luta
mie
nto
(mill
ones
de
pece
s)
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
50
100
150Basecase -- Caso baseSteepness -- Inclinacion = 0.75
Recruitment
Environmental index
Rel
ativ
e re
crui
tmen
tR
eclu
tam
ient
o re
lativ
o
-0.010 -0.005 0.0 0.005 0.010
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Relative spawning biomassBiomasa relativa de reproductores
Rel
ativ
e re
crui
tmen
tR
eclu
tam
ient
o re
lativ
o
0.0 0.2 0.4 0.6 0.8 1.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
SBR
Year -- Año
S
paw
ning
bio
mas
s ra
tioC
ocie
nte
de b
iom
asa
repr
oduc
tora
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0.0
0.2
0.4
0.6
0.8Basecase -- Caso baseSteepness -- Inclinacion = 0.75
Yield Curve
Fishing mortality relative to current fishing mortalityMortalidad por pesca relativa a la mortalidad por pesca actual
0.0 0.5 1.0 1.5 2.0
0.0
0.2
0.4
0.6
0.8
1.0
Rel
ativ
e yi
eld
Ren
dim
ient
o re
lativ
o
Fishing mortality relative to current fishing mortalityMortalidad por pesca relativa a la mortalidad por pesca actual
0.0 0.5 1.0 1.5 2.0
0.0
0.2
0.4
0.6
0.8
1.0
Rel
ativ
e po
pula
tion
fecu
ndity
Fecu
ndid
ad re
lativ
a de
la p
obla
cion
Sensitivity to L∞:proportion YFT > given length
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
Year
Prop
ortio
n >
give
n le
ngth
150160170185
150
160
170
180
190
200
210
1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010
Year
Max
imum
leng
th (c
m)
Maximum length observed by yr
Sensitivity to assumed L∞: Biomass
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
200000
400000
600000
800000
Tons
- To
nela
das
Year - Año
BasecaseLinf=170Linf=200
Recruitment
Year -- Año
Rec
ruitm
ent (
Mill
ions
of f
ish)
Rec
luta
mie
nto
(mill
ones
de
pece
s)
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0
50
100
150BasecaseLinf=170Linf=200
Spawning biomass ratioS
panw
ing
biom
ass
ratio
Coc
ient
e de
bio
mas
sa re
prod
ucto
ra
Year -- Año
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05
0.0
0.2
0.4
0.6
0.8BasecaseLinf=170Linf=200
Selectivity
0
2
4
6
Fishery -- Pesqueria 1
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 2
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 3
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 4
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 5
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 6
4 8 12 16 20 24 28
0
2
4
6
8
Fishery -- Pesqueria 7
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 8
4 8 12 16 20 24 28
0
1
2
3
4
5
6Fishery -- Pesqueria 9
4 8 12 16 20 24 28
0
2
4
6
8
10
12
14Fishery -- Pesqueria 10
4 8 12 16 20 24 28
0
1
2
3
4
5
Fishery -- Pesqueria 11
4 8 12 16 20 24 28
0
1
2
3
4
5
6Fishery -- Pesqueria 12
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 13
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 14
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 15
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 16
4 8 12 16 20 24 28
Age in quarters -- Edad en trimestres
Sel
ectiv
ity --
Sel
ectiv
idad
0
1
2
3
4
5
6Fishery -- Pesqueria 1
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 2
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 3
4 8 12 16 20 24 28
0
1
2
3
4
5
6Fishery -- Pesqueria 4
4 8 12 16 20 24 28
0
2
4
6
8
Fishery -- Pesqueria 5
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 6
4 8 12 16 20 24 28
0
2
4
6
8
Fishery -- Pesqueria 7
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 8
4 8 12 16 20 24 28
0
1
2
3
Fishery -- Pesqueria 9
4 8 12 16 20 24 28
0
2
4
6
8
10
12
14Fishery -- Pesqueria 10
4 8 12 16 20 24 28
0
1
2
3
4
Fishery -- Pesqueria 11
4 8 12 16 20 24 28
0.0
0.5
1.0
1.5
Fishery -- Pesqueria 12
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 13
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 14
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 15
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 16
4 8 12 16 20 24 28
Age in quarters -- Edad en trimestres
Sel
ectiv
ity --
Sel
ectiv
idad
0
2
4
6
Fishery -- Pesqueria 1
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 2
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 3
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 4
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 5
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 6
4 8 12 16 20 24 28
0
2
4
6
8
Fishery -- Pesqueria 7
4 8 12 16 20 24 28
0
2
4
6
8Fishery -- Pesqueria 8
4 8 12 16 20 24 28
0
1
2
3
4
5 Fishery -- Pesqueria 9
4 8 12 16 20 24 28
0
2
4
6
8
10
12
Fishery -- Pesqueria 10
4 8 12 16 20 24 28
0
1
2
3
4
5
6Fishery -- Pesqueria 11
4 8 12 16 20 24 28
0
2
4
6
Fishery -- Pesqueria 12
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 13
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 14
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 15
4 8 12 16 20 24 28
0
2
4
6
8
10
Fishery -- Pesqueria 16
4 8 12 16 20 24 28
Age in quarters -- Edad en trimestres
Sel
ectiv
ity --
Sel
ectiv
idad
Base case
L∞ = 200
L∞ = 170
AMSY table
Base case h = 0.75 L∞ = 170 L∞ = 200
Caso base h = 0.75 L∞ = 170 L∞ = 200
AMSY–RMSP 287 377 301 706 296 085 292 675 BAMSY –Brm2 420 343 551 532 421 933 432 480 SAMSY —Srm2 4 775 6 555 4 708 4 958 CRECENT/AMSY—C2002/RMSP 1.06 1.01 1.03 1.04 BRECENT/BAMSY –B2003/BRMSP 0.99 0.76 1.01 0.99 SRECENT/SAMSY –S2003/SRMSP 1.11 0.82 1.14 1.10 SAMSY/SF=0 –SRMSP/SF=0 0.37 0.43 0.36 0.38 F multiplier—Multiplicador de F 0.98 0.67 1.05 1.00
Forward Simulations
• Depletion ratio• Surface fishery catch• Longline catch
SBR
Year -- Año
0.0
0.2
0.4
0.6
0.8
1.0
Spa
wni
ng b
iom
ass
ratio
Coc
ient
e de
bio
mas
a re
prod
ucto
ra
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11
Catch
Year -- Año
Predicted purse-seine catches
Tons
- To
nela
das
0
20000
40000
60000
80000
100000
120000
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11
Year -- Año
Predicted longline catches
Num
bers
of f
ish
Num
ero
de p
eces
0
100000
200000
300000
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11
Year -- Año
Predicted purse-seine catches
Tons
- To
nela
das
0
20000
40000
60000
80000
100000
120000
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11
Year -- Año
Predicted longline catches
Num
bers
of f
ish
Num
ero
de p
eces
0
200000
400000
600000
75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11
Catch with median catchability
Summary: Main Results
• The results are similar to the previous four assessments, except that SBR at SBRAMSY is lower than in the last assessment
• The biomass is estimated to have declined slightly in 2005
• There is uncertainty about recent and future recruitment and biomass levels
What is robust
• The trend in biomass• The regime shift in recruitment
Plausible Sensitivities and Uncertainties
• The stock recruitment relationship• Asymptotic length• Uncertainty in current biomass and
recruitment
Conclusions1. The biomass is estimated to have declined
slightly in 20052. The current SBR may be close to the SBR
required to produce AMSY3. The current fishing mortality rates are close
to those required to produce AMSY4. The average weight of a yellowfin in the
catch is much less than the critical weight and increasing the average weight could increase AMSY
5. There have been two different productivity regimes and the levels of AMSY and the biomass required to produce AMSY may differ between the regimes
The END