status of ne fishery resources & related science issues

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Status of NE Fishery Resources & Related Science Issues

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Status of NE Fishery Resources & Related Science Issues. Overview. Status of major stocks (esp. GB & GOM) Scientific Basis for Biomass Goals (a case of shifting baselines?) Spatial Patterns of Effort & Distribution & effectiveness of MPAs - PowerPoint PPT Presentation

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Page 1: Status of NE Fishery Resources & Related Science Issues

Status of NE Fishery Resources& Related Science Issues

Page 2: Status of NE Fishery Resources & Related Science Issues

OverviewStatus of major stocks (esp. GB & GOM)

Scientific Basis for Biomass Goals (a case of shifting baselines?)

Spatial Patterns of Effort & Distribution & effectiveness of MPAs

Ecosystem-level issues, adaptive management, and knowledge gaps

Page 3: Status of NE Fishery Resources & Related Science Issues

Status of NE Finfish Species Groups (1963-2003)

Year

1965 1970 1975 1980 1985 1990 1995 2000

Aut

umn

Bio

mas

s In

dex

(kg/

tow

)

0

20

40

60

80

100

120

140

Sp

rin

g B

iom

ass

Ind

ex

(kg

/tow

- H

err

ing

& M

ack

ere

l)

0

2

4

6

8

10

12

Elasmobranchs Groundfish_Flounders Other FinfishHerring & Mackerel

Numerous ecosystem considerations : Predator/prey, competition

Page 4: Status of NE Fishery Resources & Related Science Issues

Current Year Stock Status - Status Determination

Biomass / B-MSY0.00 0.25 0.50 0.75 1.00

F /

F-M

SY

0.0

0.5

1.0

1.5

2.0

overfishingnot overfished

no overfishingoverfished

no overfishingnot overfished

overfishingoverfished

F-MSY

1/2 B-MSY

Page 5: Status of NE Fishery Resources & Related Science Issues

Groundfish Stock Status - 1996

Biomass 1996 / B-MSY0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00

F 1

99

6 /

F-M

SY

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

overfishingnot overfished

no overfishingoverfished

no overfishingnot overfished

overfishingoverfished

F-MSY

1/2 B-MSYSNE/MA YTF

Witch

GM Cod

CC/GM YTFSNE WinGB Cod

GB YTFPlaice

W Hake

N WindowPol GB Win

RedfishPout

S WindGM WinGM

HadGBHad

Page 6: Status of NE Fishery Resources & Related Science Issues

Groundfish Stock Status - 2002

Biomass 2002 / B-MSY0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00

F 2

00

2 /

F-M

SY

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

overfishingnot overfished

no overfishingoverfished

no overfishingnot overfished

overfishingoverfished

F-MSY

1/2 B-MSY

GM WinGB Win

N Window

Witch

CC/GM YTF

SNE/MA YTF

GB Cod

Plaice

W HakeSNE/MAWin

GB YTFPol

Redfish

Pout

SWind

GB Had

GM Had

GM Cod

Page 7: Status of NE Fishery Resources & Related Science Issues

Alaskan Groundfish Stock Status 2002

B2001/BMSY

0.0 0.5 1.0 1.5 2.0 2.5 3.05.0

F20

01/F

MS

Y

0.0

0.5

1.0

1.5

2.0

GA P-CodEBSP-Cod

GA Sable

GAPOP

AI POPEBS Pol

GA ThornyEBS YF Sole

GA Pol

EBSTurbot

EBS ArrowEBS F SoleGA Arrow

EBSO Flats

AMack EBS

R Sole

no overfishingnot overfished

overover

overfishingnot overfished

noover

FMSY

1/2 BMSY

Page 8: Status of NE Fishery Resources & Related Science Issues

Georges Bank Haddock

Year or Year Class1962 1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001

Fis

hin

g M

ort

alit

y R

ate

(F

)

0.0

0.2

0.4

0.6

0.8

Sp

awn

ing

Bio

mas

s ('

000

mt)

, Rec

ruit

men

t (m

illio

ns)

0

50

100

150

200

FSSBrecruitment F-MSY

F40% = 0.26

B-MSY=250 kmt

Page 9: Status of NE Fishery Resources & Related Science Issues

Juvenile Haddock in Scallop Dredge Survey TowsSummer, 2003

Page 10: Status of NE Fishery Resources & Related Science Issues
Page 11: Status of NE Fishery Resources & Related Science Issues

Year

1960 1965 1970 1975 1980 1985 1990 1995 2000 2005

Age

0 F

ish

Per

Hau

l

0

20

40

60

80

140160

Fall Trawl Survey-Haddock Recruitment Indices, 1963-2003

Page 12: Status of NE Fishery Resources & Related Science Issues
Page 13: Status of NE Fishery Resources & Related Science Issues

Georges Bank Haddock

Age 0 Number per Tow (Autumn)0.1 1 10 100

Age

1 R

ecru

itmen

t (m

illio

ns)

0.1

1

10

100

1000

2003

Page 14: Status of NE Fishery Resources & Related Science Issues

-0.03 -0.02 -0.01 0.00 0.01 0.02 0.03-0.03

-0.02

-0.01

0.00

0.01

0.02

0.03

1995 1999

2002

2003

off bank transport

on bank transport

mean wind stress vectors (mid-March to mid-May)1995, 1999, 2002 and 2003. (NOAA Buoy 44008)

by D. Mountain

Page 15: Status of NE Fishery Resources & Related Science Issues

Gulf of Maine Haddock

Year1962 1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001

Fis

hin

g M

ort

alit

y R

ate

(F

)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Sto

ck B

iom

ass

('00

0 m

t)

0

5

10

15

20

FSurvey Biomass (3-yr avg.)F-MSY

Page 16: Status of NE Fishery Resources & Related Science Issues

Georges Bank Cod

Year or Year Class1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002

Fis

hin

g M

ort

alit

y R

ate

(F

)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Sp

awn

ing

Bio

mas

s ('

000

mt)

, R

ecru

itm

ent

(mil

lio

ns)

0

20

40

60

80

100FSSBrecruitment F-MSY

Fmsy=0.18

Bmsy=217 k

Page 17: Status of NE Fishery Resources & Related Science Issues

Gulf of Maine Cod

Year or Year Class1982 1984 1986 1988 1990 1992 1994 1996 1998 2000 2002

Fis

hin

g M

ort

alit

y R

ate

(F)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Sp

awn

ing

Bio

mas

s ('

000

mt)

, R

ecru

itm

ent

(mil

lion

s)

0

5

10

15

20

25

30Exploitation RateSSBrecruitment F-MSY

Bmsy = 83 k

Fmsy=0.23

Page 18: Status of NE Fishery Resources & Related Science Issues

Bmsy = 59 k

Fmsy=0.25

Page 19: Status of NE Fishery Resources & Related Science Issues

Southern New England Yellowtail

Year or Year Class1974 1977 1980 1983 1986 1989 1992 1995 1998 2001

Fis

hin

g M

ort

alit

y R

ate

(F

)

0.0

0.5

1.0

1.5

2.0

2.5

Sp

awn

ing

Bio

mas

s ('

000

mt)

, R

ecru

itm

ent

(mil

lion

s)

0

20

40

60

80

FSSBrecruitment F-MSY Bmsy = 45 k

Fmsy = 0.27

Page 20: Status of NE Fishery Resources & Related Science Issues

White Hake (>/= 60 cm)

Year1965 1968 1971 1974 1977 1980 1983 1986 1989 1992 1995 1998 2001

Exp

loit

atio

n In

dex

(L

and

ing

s / S

urv

ey k

g/t

ow

)

0.0

0.5

1.0

1.5

2.0

Su

rvey

Ind

ex (

kg /

tow

, > 6

0 cm

)

0

2

4

6

8

10

12Expl. Index3-year avgF-MSY ProxySurvey Index

Page 21: Status of NE Fishery Resources & Related Science Issues

Survey Documents Recovery of Depleted Fishery Stocks

Page 22: Status of NE Fishery Resources & Related Science Issues
Page 23: Status of NE Fishery Resources & Related Science Issues

Year

1960 1965 1970 1975 1980 1985 1990 1995 2000 2005

Str

atifi

ed M

ean

Num

ber

per

Tow

0

1

2

3

Goal

Barndoor Skate – back from the dead…

Page 24: Status of NE Fishery Resources & Related Science Issues

Georges Bank Haddock – Defining a biomass target outside the historic baseline

2003 = 125 kmt!

Page 25: Status of NE Fishery Resources & Related Science Issues

Fishing Mortality Rate

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Ag

e at

En

try

to F

ish

ery

(Tc)

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

3.0

3.0

2.0

2.0

1.0

1.0

4.0

4.0

5.0

5.0

6.0

6.0

7.0

7

.0

9. 0

9

.0

8.0

8

.0

19311995-2000

1994

19651954

1945

1947

1980

1977

GB Haddock – SSB / R using modern growth data

Page 26: Status of NE Fishery Resources & Related Science Issues

Spawning Stock Biomass ('000 t)

0 25 50 75 100 125 150 175 200

Ag

e 1

Rec

ruit

s (m

illio

ns)

0

25

50

75

100

125

150

175

200

1931-1963 YCs1964-2000 YCs

'62 YC

'75 YC

'00 YC

(486)'63 YC

Page 27: Status of NE Fishery Resources & Related Science Issues

How was the New Biomass target forGeorges Bank Haddock Computed?

Bmsy = mean recruitment when SSB > 75,000 mt = 68.9 milliontimes spawning biomass per animal at F = 0.263 = 3.63 kg= 250 thousand metric tons

Fishing Mortality Rate (F)

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

Sp

awn

ing

Bio

ma

ss p

er

An

imal

(lif

eti

me,

kg

)

0

2

4

6

8

10

Page 28: Status of NE Fishery Resources & Related Science Issues

Sea Scallop Landings by Stock Area

0

5000

10000

15000

20000

25000

1960 1970 1980 1990 2000

Year

Land

ings

(MT

of m

eat)

Georges BankMid-AtlanticTOTAL

Proportion from Closed Areas

1999 --27%2000 --16%2001 --18%2002 --3%

Can this be Done in Reality?

Page 29: Status of NE Fishery Resources & Related Science Issues

1983 1986 1989 1992 1995 1998 2001

Sca

llop

Den

sity

(kg

/to

w, m

eats

)

0

2

4

6

8

10

12

14

16

18

20

22

Overall DensityClosed AreasOpen Areas

Atlantic Sea Scallop

Page 30: Status of NE Fishery Resources & Related Science Issues

1994

Density (number per tow)

-5 0 5 10 15

Sh

ell

He

igh

t (m

m)

40

60

80

100

120

140

160

ClosedOpen

2001

Density (number per tow)

Sh

ell

He

igh

t (m

m)

40

60

80

100

120

140

160

OpenClosed

Page 31: Status of NE Fishery Resources & Related Science Issues

Georges Bank Scallop Recruitment

Year

1980 1985 1990 1995 2000

Ag

e 2

Rec

ruit

s p

er S

urv

ey T

ow

0

100

200

300

400

500

Median Recruitment = 100 per Tow

Page 32: Status of NE Fishery Resources & Related Science Issues

X Data

2 4 6 8 10 12 14 16 18 20

Num

bers

& M

eat

Wei

ght

(gra

ms)

0

20

40

60

80

100

Average meat weight (g)Numbers at Age (M=0.1)

Age (years)

2 4 6 8 10 12 14 16 18 20

Num

bers

X M

eat W

eigh

t

0

500

1000

1500

2000

2500

3000

Biomass Curve

Page 33: Status of NE Fishery Resources & Related Science Issues

X Data

2 4 6 8 10 12 14 16 18 20

Num

bers

& M

eat

Wei

ght

(gra

ms)

0

20

40

60

80

100

Average meat weight (g)Numbers at Age (M=0.1)Numbers at Age (Ages 2+ F=0.9)

Age (years)

2 4 6 8 10 12 14 16 18 20

Nu

mb

ers

X M

eat W

eigh

t

0

500

1000

1500

2000

2500

3000

Biomass M=0.1Biomass Z=1.0

Page 34: Status of NE Fishery Resources & Related Science Issues

ScallopFishermenGB Survey

SessileSuccess!

Page 35: Status of NE Fishery Resources & Related Science Issues

Three Main Biological Effects of MPAs

“Reserve Effects” = higher density in closed areas, demographic shifts, reproductive output increased, potentially resulting in:

“Spill Over” = net movement out of adults (apart from ontogenetic or other non-density related movements)

A Really Big Question: Is there a “Fatal Attraction” of fishing effort to reserve boundaries, seeking spillover?

“ Export” = net export of larvae or juveniles to open areas

Fisheries benefit from permanently closed areas via Spillover, Export, or overall reductions in fishing rate

Page 36: Status of NE Fishery Resources & Related Science Issues

Spatial Management & MPAs• New England fishery closed areas: a 9 year + casestudy in temperate waters (5 pseudo-replicates)

• Previous work (2000) demonstrated “reserve effects” especially for sea scallop and other benthics

• Seasonal movements and depth distributions of manytarget species means that cross-boundary excursions are frequent

• Are the MPAs providing benefits to conservationof groundfish resources, & the fishery, and what can we learn about movement & dispersion? approaches:

• Differential densities (in/out)• Potential for “spillover”

Page 37: Status of NE Fishery Resources & Related Science Issues

“Rolling Closures”

In addition toYear-roundclosures

May

June

May

March

AprilOct-Nov.

Page 38: Status of NE Fishery Resources & Related Science Issues

Are habitat gradientsconfounding theinterpretation?

Page 39: Status of NE Fishery Resources & Related Science Issues

2003 Revised

2003VMS PositionsFor speed </= 3.5 knMos. 1-12

Multispecies(groundfish)

Trawlers

pixel is1’ lat by1’ long

movie…

Page 40: Status of NE Fishery Resources & Related Science Issues

2003

VMS Positions

For speed

> 3.5 kn

Mos. 1-10

Page 41: Status of NE Fishery Resources & Related Science Issues

-73 -72 -71 -70 -69 -68 -67 -6640

41

42

43

44

45

012345

DF_GP

-73 -72 -71 -70 -69 -68 -67 -6640

41

42

43

44

45

40

41

42

43

44

45-73 -72 -71 -70 -69 -68 -67 -66

1991-1993

Trawler Effort Patterns

10’ squaresw/1/4 degreeProration of somedata

Page 42: Status of NE Fishery Resources & Related Science Issues

Requirements for “Spillover”

• Pressure Head (differential densities in/out)

• High Velocity at “Spillway” (velocity and volume dissipate w/distance)

• Test for Spillover is 2-part:

•First, is there a densitydifferential (in/out)? then:

•Density vs. distance from edge

Page 43: Status of NE Fishery Resources & Related Science Issues

“Footprint Analyses”

Page 44: Status of NE Fishery Resources & Related Science Issues

Closed Area I

Ratio In:Out

0 2 4 6 8 10 12 14 16 18 20 30

monkfish cod

winter flwitch

yellowtailplaice

haddockpollockdogfishsculpin

little skatewinter skatewindowpane

herringtotal weight

total number

2001-2003

Autumn

Spring

Page 45: Status of NE Fishery Resources & Related Science Issues

Closed Area II

Ratio In:Out

0 1 2 3 4 5 6 14

monkfishcod

winter fl witch

yellowtailplaice

haddockpollocksculpin

little skatewinter skatewindowpane

herringlobster

total weighttotal number

2001-2003

Autumn

Spring

Page 46: Status of NE Fishery Resources & Related Science Issues

Haddock, Closed Area I, Fall

Year

1960 1965 1970 1975 1980 1985 1990 1995 2000 2005

Mea

n W

eigh

t per

Tow

(ln

kg

+ 1

)

0

1

2

3

4

5

Inside

Outside

Page 47: Status of NE Fishery Resources & Related Science Issues

Haddock, Closed Area I

year

1960 1965 1970 1975 1980 1985 1990 1995 2000 2005

Rat

io o

f cat

ches

Insi

de/O

utsi

de (

ln k

g/to

w +

1)

0

2

4

6

8

10

12

14

1620

24

28

Area closed

Page 48: Status of NE Fishery Resources & Related Science Issues

“Proximity Analyses”

R/V Data too sparse for tests of “spill over”

Fortunately, fishermen have been conducting this experiment for us

adjust commercial trawler catches for effort species targeting, etc. & Calibrate

Sea Sampling in New England increased in recent years because of court order (7,000+ tows in 2003)

Page 49: Status of NE Fishery Resources & Related Science Issues

Effects of Closures on Groundfishes

Otter Trawl fleet

Page 50: Status of NE Fishery Resources & Related Science Issues

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Monkfish CPUE

Page 59: Status of NE Fishery Resources & Related Science Issues

Closed Area I

0 100 200 300 400

1000

2000

3000

4000

Closed Area II

0 100 200 300 400

1000

2000

3000

4000

NantucketLight Ship

0 100 200 300 400

1000

2000

3000

4000

W. Gulf of Maine

0 100 200 300 400

1000

2000

3000

4000

Haddock CPUE (kg/hr) - positive tows

Distance from Closed Area (km)

Page 60: Status of NE Fishery Resources & Related Science Issues

Haddock kg/haul

0 lbs.0.1-500 lbs.501-1000 lbs1001-3000 lbs.3001-7500 lbs

Page 61: Status of NE Fishery Resources & Related Science Issues

0 10 20 30 40 50

distance (km)

-202468

10

ln T

ota

l cpue

-202468

10

ln H

addock

cpue

0 10 20 30 40 50

-202468

10

200

400

600

800

1000hours

fis

hed

Effort and Catch Rates Near Closed Area I 2001-2002

Page 62: Status of NE Fishery Resources & Related Science Issues

Haddock - CPUE vs. Distance to CA-I

Kilometers from Closed Area I0.01 0.1 1 10

Had

do

ck k

g p

er h

aul

0.1

1

10

100

1000

Page 63: Status of NE Fishery Resources & Related Science Issues

cod - CPUE vs. Distance to CA-I

Kilometers from Closed Area I0.01 0.1 1 10

kg

pe

r h

ou

r

0.1

1

10

100

1000

Page 64: Status of NE Fishery Resources & Related Science Issues

Joint CDFs of Catch & Effort by Distance from CA-I

CDF Total Hours Fished

0.05 0.10 0.15 0.20 0.25 0.30 0.35

CD

F o

f C

atch

0.0

0.2

0.4

0.6

0.8

1.0

Haddock Total Catch

1 km

2

15

3

Page 65: Status of NE Fishery Resources & Related Science Issues

-1.0 -0.5 0.0 0.5 1.0Slope

0

10

20

30

Fre

qu

en

cy

0.0

0.1

0.2

0.3

0.4

0.5

Pro

po

rtion

pe

r Ba

r

ln (CPUE(i)) = a + b * ln (X(i)) + ε(i)

51 species/Area CombinationsTested

13 sig.

5 sig. neg.Slope

Haddock CA-IYT, Win CA-IIYT NLSWitch WGOM

N=51

0-50 km

Page 66: Status of NE Fishery Resources & Related Science Issues

Nu

mb

er p

er 1

0 m

^2

0

20

40

60

80

100

0 2 4 6 8 10 12 14 16MONTH

1.0

10.0

100.0

1000.0

Spawning-Related Movements?

Nearest20 km

Page 67: Status of NE Fishery Resources & Related Science Issues

MetBuoyLocations

EnvironmentallyDrivenMovements?

Page 68: Status of NE Fishery Resources & Related Science Issues

January, 2003Buoy 44018

0 2 4 6 8 10 12 14 160

2

4

6

8

10

12

14

16

02468101214160

2

4

6

8

10

12

14

16

Hourly Speed &Direction

Page 69: Status of NE Fishery Resources & Related Science Issues

Buoy 44018 - 2003

Month

1 2 3 4 5 6 7 8 9 10 11 12

Deg

rees

C

0

5

10

15

20

25

airH20

Monthly - Median Direction - Mean Speed

Page 70: Status of NE Fishery Resources & Related Science Issues

conclusions so far……• Closed areas integral to species recoveries in some

areas• Reserve effects demonstrated on the “sessile spectrum”• Unequivocal evidence of fishing effects• Displaced effort important for some species – there

may be a “fatal attraction”• Spillover is a complicated issue in gradients• Visualization Project is our next Step (account for various movement patterns, density-driven

dispersion, spawning, random, environmentally forced)• Export is an ongoing challenge (GLOBEC?)

Page 71: Status of NE Fishery Resources & Related Science Issues

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Haddock DistributionsGLOBEC

Page 72: Status of NE Fishery Resources & Related Science Issues

Some Ecosystem Issues of Interest…

• indirect effects of harvesting:- trophic cascades and feedbacks to & from lower trophic levels

- effects of fishing on bottom habitats

• Consequences of environmental variability- trend and amplitude

- harvesting strategies to increase resiliency?

• adaptive management in stock rebuilding scenarios- density dependence in vital rates?

- is there enough primary production?

Page 73: Status of NE Fishery Resources & Related Science Issues

Feedback

HabitatEffects

Environmental Variation(trend, variance)

Fishery Effects

Resource Species(intermediate consumer)

Apex Predator

Intermediate PelagicTrophic Level

Lower PelagicTrophic Levels

Ecosystem Processes Relevant toAquatic Resource Management

Density Dependence

Benthostrophic cascade

yield

yield

trophic cascade

sinkprey

prey

prey

sink

fishing gearimpacts

yield

yield

Regime Shiftso environmentally driveno fishery driven ?

Flow

Indirect Effects

?

prey

Page 74: Status of NE Fishery Resources & Related Science Issues

Atlantic Herring - Atlantic Mackerel - Zooplankton

Year

1965 1970 1975 1980 1985 1990 1995 2000 2005

Spr

ing

Sur

vey

Bio

mas

s In

dex

(kg/

tow

)

0

2

4

6

8

10

12

14

16

18

Zoo

plan

kton

Vol

ume

(cc/

100

m3)

10

20

30

40

50

Herring Mackerel Zooplankton

Monitoring Lower Trophic levels and prey Stocks

Page 75: Status of NE Fishery Resources & Related Science Issues

Georges Bank Haddock Growth & Density

Year

1960 1965 1970 1975 1980 1985 1990 1995 2000

Mea

n W

eigh

t (kg

)

0

1

2

3

4

5

6

Spaw

ning

Sto

ck B

iom

ass

(met

ric to

ns, '

000s

)

0

25

50

75

100

125

150

175

200

Age 2Age 3Age 4Age 5SSB

Georges Bank Haddock

Stock Biomass ('000 tons)

0 20 40 60 80 100 120 140 160 180 200

Mea

n W

eigh

t at A

ge (k

g)

0

1

2

3

4

5

1

2

3

4

5

6

Are Stationarity Assumptions of SSB/R Valid?

Page 76: Status of NE Fishery Resources & Related Science Issues

Georges Bank Yellowtail Flounder

Stock Biomass ('000 tons)

0 10 20 30 40 50 60

Mea

n W

eigh

t at

Age

(kg

)

0.2

0.4

0.6

0.8

1.0

1.2

2

3

4

5

6

Yellowtail Flounder - Growth & Density

Year

1970 1975 1980 1985 1990 1995 2000

Mea

n W

eigh

t (kg

)

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Stoc

k Bi

omas

s (m

etric

tons

, 000

's)

0

10

20

30

40

50

60

Age 2Age 3Age 4Age 5Age 6Biomass

Changes in Populations Due to Fishing and Environment

Page 77: Status of NE Fishery Resources & Related Science Issues

Georges Bank Cod Growth & Density

Year

1970 1975 1980 1985 1990 1995 2000

Mea

n W

eig

ht

(kg

)

0

1

2

3

4

5

6

7

Su

rvey

Ab

un

dan

ce (

kg/t

ow

, sm

oo

thed

)

0

2

4

6

8

10

12

14

16

18

20

Age 1Age 2Age 3Age 4Biomass Index

Page 78: Status of NE Fishery Resources & Related Science Issues

Georges Bank - Autumn

Groundfish Complex minus Species (kg/tow)

1 10 100

Sp

ecie

s A

bu

nd

ance

(kg

/to

w)

0.1

1

10

100 yellowtail fl.

cod

haddock

winter fl.

windowpane

Can these BiomassTargets be achievedFor all stocksSimultaneously?

Each Stock Plottedvs. sum of all others

38 Year TimeSeries of TrawlSurveys

Page 79: Status of NE Fishery Resources & Related Science Issues

 "The picture's pretty bleak, gentlemen ... the world's climates are changing, the mammals are taking over,and we all have a brain about the size of a walnut."

We Need an Adaptive Approach!

Page 80: Status of NE Fishery Resources & Related Science Issues

Proposal for Periodic Re-Consideration of BiomassReference Points for Rebuilding Stocks

• Monitor the pace of rebuilding relative to stock production• Examine population Dynamics parameters for signs of density dependence or species interaction, especially:

• length/weight at age• condition factor (weight per length)• maturity at age• stomach contents• relative abundance• recruitment• spawning biomass• environmental conditions• geographic distributions

Revise if density dependence or interactions dictate!

Page 81: Status of NE Fishery Resources & Related Science Issues

Current State of the Artin NE Habitat typing

What HabitatsAre trawledthe most?

(GIS Problem)

USGSCompilation

Page 82: Status of NE Fishery Resources & Related Science Issues

1960 1965 1970 1975 1980 1985 1990 1995 2000

Aut

umn

Bot

tom

Ano

mal

y EC

-3-2-10123

Gulf of MaineGeorges Bank

Spr

ing

Bot

tom

Ano

mal

y EC

-2-1012

trends in environmental conditions?