environmental effects on recruitment of northern shrimp in the gulf of maine
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Environmental Effects on Recruitment of Northern Shrimp in the Gulf of Maine. Anne Richards Michael Fogarty David Mountain NOAA National Marine Fisheries Service Woods Hole, MA. Outline. stock-recruit-environment relations mechanisms for recruit-env’t relation.

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environmental effects on recruitment of northern shrimp in the gulf of maine

Environmental Effects on Recruitment of Northern Shrimp in the Gulf of Maine

Anne Richards

Michael Fogarty

David Mountain

NOAA National Marine Fisheries Service

Woods Hole, MA

slide2
Outline
  • stock-recruit-environment relations
  • mechanisms for recruit-env’t relation
northern shrimp pandalus borealis
Northern ShrimpPandalus borealis
  • Boreal distribution
  • Gulf of Maine=southern limit
  • Locally important fishery

from Shumway et al. 1985

Life history

Fishery

impetus
Impetus
  • Conventional wisdom: temperature = primary regulating factor
  • will “…not respond well to attempts to control exploitation”

(Apollonio et al. 1986)

environmental variables
Environmental Variables
  • Temperature anomalies (W Gulf of Maine)
    • fall bottom: developmental rates, egg parasitism
    • spring bottom: developmental rates, hatch timing
    • spring surface: larval development
  • NAO winter index
analysis
Analysis
  • Box-Jenkins TSA to ID factors affecting recruitment
  • S-R with environmental inputs
results tsa significant crosscorrelations with recruitment
SSB

2

+

Spring Surface TA

-

Spring Bottom TA

4

-

NAO

1

-

Results – TSASignificant crosscorrelations with recruitment

Lag

Sign

1

Planktonic larvae

Male maturation, gender transition

without 2002

conclusion
Conclusion
  • Shrimp recruitment dependent on SSB and spring temperatures (surface and bottom)
mechanisms spring sst
Mechanisms: Spring SST
  • Spring surface temperature effect (larvae):
    • Appears intuitively correct
    • But counters laboratory studies: better growth and survival at warmer temperatures.
    • Indirect effect, e.g. match-mismatch?
match mismatch hypothesis
Match-Mismatch Hypothesis
  • Coastal Gulf of Maine: Bloom timing determined by solar insolation (Townsend and coauthors)
  • Shrimp development: temperature-dependent
match mismatch hypothesis1
Match-Mismatch Hypothesis
  • Bloom timing
  • Hatch timing
  • Survival rates
bloom timing
Bloom Timing
  • Townsend and Cammen (1988): 1971-1980
  • CZCS and SeaWifs

’78-’86, ’98-’03

hatch dates
Hatch Dates
  • Maine DMR fishery sampling, 1980-1983 and 1989-1993
  • Probit analysis: 50% hatch, duration of hatch
shrimp development
Shrimp Development
  • temperature-dependent
larval shrimp diet
Larval Shrimp Diet
  • Zooplankton bloom ~ one month later (Townsend 1984)

Stage I larvae

Stickney and Perkins (1980)

application
Application
  • Management:

Adjust fishing effort to allow higher egg deposition in warmer years

stephen h clark
SummaryStephen H. Clark

1) SSB and spring temperatures affect GoM shrimp rcrt

2) Spring SST effect may be mediated through match-mismatch

ongoing work
Ongoing Work
  • Bloom timing
    • Solar insolation, 1982-1999
    • CZCS / SeaWiFS, ‘83-’91, ‘97-’03
  • Hatch timing
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