alaska king crab research.ppt
TRANSCRIPT
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Alaska King Crab Research,
Rehabilitation & Biology Program
An Introduction
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The AKCRRAB Science Team
Ginny Eckert UAF/UAS
Brad Stevens U. Mass. Dartmouth
Brian Allee Alaska Sea GrantJeff Hetrick Alutiiq Pride Shellfish Hatchery
Sara Persselin NOAA NMFS
Celeste Leroux UAF/Alaska Sea GrantBen Daly Alaska Sea Grant
Jim Swingle Alaska Sea Grant
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Background Red King Crab Fishery
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Background Blue King Crab Fishery
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Early Enhancement Activities in Alaska
1992 International King CrabRehabilitation and EnhancementSymposium
1990s-2000s Extensive research
by Dr. Brad Stevens in Kodiakand Japan
2000s Continued research byNMFS Kodiak
2006 Alaska Crab StockEnhancement and RehabilitationWorkshop
Small scale experiment setup
S. Persselin and B. Stevens, Kodiak AK
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AKCRRAB - Structure
Steering Committee
Science Team
Partnerships
Research collaborators
Advisory Board
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Crab and Lobster Enhancement Initiatives-A Few Examples-
Swimming crab, Japan
Red King Crab, Japan
American Lobster, New England
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Crab and Lobster Enhancement Initiatives-A Few Examples-
Blue crab, Chesapeake Bay
Excellent model for
investigating feasibility of
enhancement
European lobster, Norway Commercial sea ranching
very successful
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Prezoea
Crab Instar 1Glaucothoe
Zoea 4Zoea 3Zoea 1 Zoea 2
Egg Day 1 Egg Day 395
King Crab Life Cycle
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King Crab Life Cycle
Female with extruded eggsMating behavior
Juvenile podding behavior Adult solitary behavior
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Broodstock Collection
St. Paul, Pribilof Islands
November 2006Alitak Bay, Kodiak
July 2006
Anchorage
Seward
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Hatchery Setup
Alutiiq Pride Shellfish HatcherySeward Marine Center
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Hatchery Setup Larval culture
Larval Rearing Modules at APSH
Flow-through system Conical bottom tanks
Circulation with air stones
Uniform lighting of tanks
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Larval Rearing Food Production
Algae production
24 hr. oldArtemia nauplius
Artemia sp. production
Isochrysis galbana algae
Artemia sp. (brine shrimp) Algae
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AKCRRAB 2007 Experiments
Red King Crab Larval diet study
Larval density
hatchery trials
Blue King Crab
Larval diet/handling
stress study
Larval density study
Juvenile trial rearing
Water quality
investigation P. Platypus ZIs swim in Petri dish
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RKC Larval Rearing Diet StudyMarch 7, 2007 May 3, 2007
Purpose:
To test effect of algae or diatom enrichmenton RKC larval survival and growth toglaucothoe stage.
Diet Treatments:
Isochrysis galbana Tahitian strian (T-ISO)
Pavlova lutheri(PAV)
Thalassiosira pseudonana (3H)No enrichment,Artemia sp. only (Art.)
P. camtschaticus ZI
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RKC Larval Rearing Survival
Percent Survival of RKC Larvae
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
Z1 Z2 Z3 Z4 early G late G
3H Art Iso Pav
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BKC Larval Handling Stress/Diet studyMay 14, 2007 June 12, 2007
Purpose:
To test effects of live algae vs. algae
concentrate as dietary enrichment
and effect of handling stress on
BKC larval survival and growth tothe glaucothoe stage.
Treatments:
Diet: Live T-ISOConcentrate T-ISO
Handling: Once per zoeal stage
No handling
P. platypus ZIs
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BKC Larval Rearing - Survival
Percent survival per diet treatment
-handling treatment only-
0
10
20
30
40
50
60
70
80
90
100
Z1 Z2 Z3 Z4 G
MEAN LIVE MEAN CONCENTRATE
Percent Survival of all BKC ZI to G
0
20
40
60
80
100
Z1 G
Handling, live algae No handling, live algae
Handling, algae concentrate No handling, algae concentrate
C & C G
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RKC & BKC Growth
Average dry weight of larvae
0.000
0.200
0.400
0.600
0.800
1.000
1.200
ZI ZII ZIII ZIV
Weightinmilligrams
RKC BKC
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Average Temp. of RKC Larval Rearing Tanks
3
4
5
6
7
8
9
10
Duration of experiment
DegreesCe
lcius
Average temperature of BKC larval rearing tanks
3
5
7
9
11
13
Duration of experiment
DegreesCelcius
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Larval Rearing Survival - Discussion
Concern Course of Action
Water Quality Monitor for hydrocarbons
Microbiological contamination Monitor forVibrio bacteria
Temperature fluctuation Improve water systemExcessive aeration Decrease aeration
Nutritional deprivation Fatty acid analysis &
Further diet investigations
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Other Hatchery Studies
Larval rearing density studies Water quality investigations
Juvenile trial rearing
Pathology & Genetics
Larval fatty acid analysis
Larval growth measurements
Ongoing Projects
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2007 Research Findings Summary
Hatchery scale red and blue king crab larval and juvenilerearing is possible.
Tremendous accomplishment in areas of technology
transfer, hatchery setup, preliminary research and
baseline data.
Need to refine setup in identified ways to improve
survival, as expected.
P. camtschaticus glaucothoe
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AKCRRAB Long-term vision
Artificial Propagation
Habitat Studies
Genetics & Pathology
Goal: Assess biological & economicfeasibility of red and blue king crab
population rehabilitation through ocean
ranching.
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Thanks
Alaska Sea Grant College Program
AKCRRAB Science Team & Steering Committee
NOAA Aquaculture Program
NOAA National Marine Fisheries Service UAF School of Fisheries and Ocean Sciences
Alutiiq Pride Shellfish Hatchery
Alaska Department of Fish and Game
United Fishermans Association Central Bering Sea Fishermans Association
United Fishermans Marketing Association
and all of our supporters nationwide
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Questions
R d ki b (P t h ti ) S d Al k