alaska king crab research, rehabilitation
TRANSCRIPT
Alaska King Crab Research, Rehabilitation & Biology Program
An Introduction
Presented by Celeste LerouxUniversity of Alaska Fairbanks
School of Fisheries and Ocean Sciences
Alaska Sea Grant College Program
The AKCRRAB Science Team
Ginny Eckert UAF/UAS
Brad StevensU. Mass. Dartmouth
Brian Allee Alaska Sea Grant
Jeff Hetrick Alutiiq Pride Shellfish Hatchery
Sara Persselin NOAA NMFS
Celeste Leroux UAF/Alaska Sea Grant
Ben Daly Alaska Sea Grant
Jim Swingle Alaska Sea Grant
Background – Red King Crab Fishery
Background – Blue King Crab Fishery
Early Enhancement Activities in Alaska
• 1992 International King Crab Rehabilitation and Enhancement Symposium
• 1990s-2000s Extensive research by Dr. Brad Stevens in Kodiak and Japan
• 2000s Continued research by NMFS Kodiak
• 2006 Alaska Crab Stock Enhancement and Rehabilitation Workshop
Small scale experiment setup
S. Persselin and B. Stevens, Kodiak AK
AKCRRAB - Structure
• Steering Committee
• Science Team
• Partnerships
• Research collaborators
• Advisory Board
Crab and Lobster Enhancement Initiatives-A Few Examples-
• Swimming crab, Japan
• Red King Crab, Japan
• American Lobster, New England
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
Prezoea
Crab Instar 1Glaucothoe
Zoea 4Zoea 3Zoea 1 Zoea 2
Egg –Day 1 Egg – Day 395
King Crab Life Cycle
King Crab Life Cycle
Female with extruded eggsMating behavior
Juvenile ‘podding’ behavior Adult solitary behavior
Broodstock Collection
St. Paul, Pribilof Islands
November 2006 Alitak Bay, Kodiak
July 2006
Anchorage
Seward
Hatchery Setup
Alutiiq Pride Shellfish HatcherySeward Marine Center
Hatchery Setup – Larval culture
Larval Rearing Modules at APSH
• Flow-through system• Conical bottom tanks• Circulation with air stones• Uniform lighting of tanks
Larval Rearing – Food Production
Algae production
24 hr. old Artemia nauplius
Artemia sp. production
Isochrysis galbana algae
Artemia sp. (brine shrimp) Algae
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
RKC Larval Rearing Diet StudyMarch 7, 2007 – May 3, 2007
Purpose:To test effect of algae or diatom enrichment
on RKC larval survival and growth to glaucothoe stage.
Diet Treatments:Isochrysis galbana Tahitian strian (T-ISO)Pavlova lutheri (PAV)Thalassiosira pseudonana (3H)No enrichment, Artemia sp. only (Art.)
P. camtschaticus ZI
RKC Larval Rearing – Survival
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 to the glaucothoe stage.
Treatments:
Diet: Live T-ISO
Concentrate T-ISO
Handling: Once per zoeal stage
No handling
P. platypus ZIs
BKC Larval Rearing - Survival
RKC & BKC – GrowthAverage dry weight of larvae
0.000
0.200
0.400
0.600
0.800
1.000
1.200
ZI ZII ZIII ZIV
Wei
gh
t in
mill
igra
ms
RKC BKC
Average Temp. of RKC Larval Rearing Tanks
3
4
5
6
7
8
9
10
Duration of experiment
De
gre
es
Ce
lciu
s
Larval Rearing Survival - Discussion
Concern Course of Action
Water Quality Monitor for hydrocarbons
Microbiological contamination Monitor for Vibrio bacteria
Temperature fluctuation Improve water system
Excessive aeration Decrease aeration
Nutritional deprivation Fatty acid analysis &
Further diet investigations
Other Hatchery Studies• Larval rearing density studies
• Water quality investigations
• Juvenile trial rearing
• Pathology & Genetics
• Larval fatty acid analysis
• Larval growth measurements
Ongoing Projects
2007 Research Findings Summary
• Hatchery scale red and blue king crab larval and juvenile rearing 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
AKCRRAB Long-term vision
Artificial Propagation
Habitat Studies
Genetics & Pathology
Goal: Assess biological & economic feasibility of red and blue king crab population rehabilitation through ocean ranching.
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 Fisherman’s Association• Central Bering Sea Fisherman’s Association• United Fisherman’s Marketing Association…and all of our supporters nationwide
Questions
Red king crab (P. camtschaticus) eggs, Seward, Alaska