alaska king crab rehab and research program · •final goal: transition hatchery techniques and...
TRANSCRIPT
Alaska King Crab Rehab and Research Program
Robert Foy
Alaska Fisheries Science Center
Crab Science Symposium
September 16, 2013
The Problem: Where did the king crab go?
Why have they not rebounded without fishing?
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 2
If larvae are being swept away by
currents (changes in oceanography
or acidification), or overfishing
threshold reached
Enhancement could help stock crab
AFTER the larval stage
If habitat has changed or predators
have increased… Enhancement may not be effective
Control 7.8 pH 7.5 pH
Crab Culturing: some History
1990s Field studies on post-larval supply by ADF&G
1992 International King Crab Rehabilitation and Enhancement Symposium
1996 Kodiak Lab culturing research
2000-2005 blue king crab diet and habitat studies
2004 formation of AKCRRAB
2006 Alaska Crab Stock Enhancement and Rehabilitation Workshop
Blue King Crab
Paralithodes
platypus
Red King Crab
Paralithodes
camtschaticus
What is AKCRRAB….
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 4
• Formed in 2004
• Coalition of university, federal and stakeholder groups.
• Goals: adding to the scientific understanding of crab life history
and ecology, and rehabilitating depressed king crab stocks in
Alaska.
• Initial focus: red king crab in the Kodiak Island region and blue
king crab near the Pribilof Islands.
• Belief: Important for regional long-term economic development
and sustainability.
• Final Goal: transition hatchery techniques and outplanting
technologies to communities and industry as part of statewide
efforts to help rehabilitate depleted king crab stocks.
Strategic Plan
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 5
PRODUCTION
I. Broodstock Collection
II. Broodstock Holding
POPULATION AND STOCK DIFFERENTIATION
I. Genetics
II. Marking
PRE_RELEASE STUDIES
I. Hatchery-Wild Interactions
II. Nursery Habitat
OUTPLANTING AND FEASIBILITY STUDIES
2011-2012 mass rearing in Kodiak
Production
Does water filtration affect survival?
Do hatchery water sources affect survival in the lab?
Do different diets affect survival in the lab?
Diet treatments
Conducted in Kodiak and Seward
1) newly-hatched Artemia nauplii
2) newly-hatched Artemia nauplii
and the diatom Thalassiosira
nordenskioeldii
Water source treatments
1) seawater from Resurrection Bay
2) seawater made with artificial
sea salt (Instant Ocean®)
Thallasiosira
nordenskioeldii
Artemia nauplius
Enhancement Science:
What do we need to know first?
Production
Can we separate them?
Enhancement Science:
Just when you thought it was safe…the crab
ate each other!!
YES AND NO
Day
0 50 100 150 200 250
% S
urviv
al
20
40
60
80
100
Small
Medium
Large
Production
Can we separate them?
Enhancement Science:
Just when you thought it was safe…the crab
ate each other!!
YES AND NO
Prey Density
0 5 10 15 20 25 30
Pro
po
rtio
n E
ate
n
0.0
0.2
0.4
0.6
0.8
1.0
Sand
Shell Hash
Shell
Sand/Shell Hash
Shell
Red king crab inter-cohort cannibalism
in red king crab
Stock at HIGH DENSITY
Stock every 2 years
Strategic Plan
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 13
PRODUCTION
I. Broodstock Collection
II. Broodstock Holding
POPULATION AND STOCK DIFFERENTIATION
I. Genetics
II. Marking
PRE_RELEASE STUDIES
I. Hatchery-Wild Interactions
II. Nursery Habitat
OUTPLANTING AND FEASIBILITY STUDIES
2010
• Hatchery-reared king crabs show weak habitat preference
• RKC ‘smarter’ than BKC
• Predator presence increases preference for complex
habitat
• Some evidence for density dependence
• Predation by year-1 RKC on BKC is lower in complex
habitat
• RKC have a competitive advantage over BKC when
reared together
Pribilof Islands: will they get along?
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 14
15
Hatchery crab: will they fit in?
Strategic Plan
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 16
PRODUCTION
I. Broodstock Collection
II. Broodstock Holding
POPULATION AND STOCK DIFFERENTIATION
I. Genetics
II. Marking
PRE_RELEASE STUDIES
I. Hatchery-Wild Interactions
II. Nursery Habitat
OUTPLANTING AND FEASIBILITY STUDIES
Habitat characterization and utilization of early
benthic phase red king crab on Kodiak Island
2008 project goals: •Identify areas of larval supply •Characterize initial settlement habitat •Assess relationship between areas of supply and settlement
2009 project goals:
•Identify larval supply in historically known red king crab habitat
•Quantify settlement density
•Habitat use by early benthic and juvenile phase
•Annual progression of biogenic habitat in 2009-2010
Habitat characterization and utilization of early benthic phase red king
crab on Kodiak Island
OUTPLANTING AND FEASIBILITY STUDIES
Where to stock crab?
Are crab already there?
How many crab can an area hold?
What is the genetic variability?
What habitat is necessary and available?
What competitors and predators might be there?
Enhancement Science:
So lets put some in the ocean…the Kodiak
experiment
2009 project goals: •Assess habitat in Sitkalidak Straits near Old Harbor, Kodiak •Use HSI models to quantify habitat and develop an index •Habitat types: inter/sub tidal, slope, deep soft, deep firm
2010 project goals:
•Expand understanding of habitat
availability
•Assess predator densities and
relationship to substrate
Old Harbor: experimental outstocking
2011 project goals:
•Compare Old Harbor to Alitak
Juvenile RKC density m-2
Habitat Old Harbor Alitak
Hard 0.00 0.34
Hard Macroalgae 0.00 0.07
Soft 0.00 0.00
Soft Macroalgae 0.00 0.00
Hard: > 50% rock, shell, or gravel
Soft: ≥ 50 % sand or mud
Macroalgae: > 50% macroalgae cover
Substrate is more important than
structure forming biota
Old Harbor: experimental outstocking
Old Harbor: experimental outstocking
• When?
• Now
• How many?
• 13,000 (but don’t worry, they are small)
• What is the most effective density?
• Assess daily, weekly, monthly
• Stay tuned!
Pribilof Islands: available habitat?
• Has habitat changed in the past 40 year?
• Where could we work on experiments?
• What habitat is available in the Pribilofs?
• Stay tuned!
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0crab
bio
mas
s (l
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* 1
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)
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 25
Community/Industry
Alaskan Shellfish Growers Association
Aleutian Pribilof Island Community Development Association
Alutiiq Pride Shellfish Hatchery
Central Bering Sea Fishermen's Association
Chugach Regional Resources Commission
Gulf of Alaska Coastal Communities Coalition
Norton Sound Economic Development Corporation
United Fishermen's Marketing Association
Government/University
NOAA Aquaculture Program
NOAA National Marine Fisheries Service
University of Alaska Fairbanks School of Fisheries and Ocean Sciences
University of Alaska Southeast
Supporters
Alaska Bering Sea Crabbers
Bering Sea Fisheries Research Foundation
Groundfish Forum
Santa Monica Seafoods
Authors, Coauthors, and Collaborators • Alutiiq Pride Shellfish
Hatchery
• Karen Barnard
• Janelle Christianson
• Kyle Tidwell
• Cathrine Hancock
• Lexa Meyer
• Karen Barnard
• Caitlin Harris
• Heather Page
• Ryan Fields
• Chris Long
• Kathy Swiney
• Sara Persselin
• Jessica Popp
• Ben Cournoyer
• Al Stoner
• Ginny Eckert
• Eric Munk
• Pete Cummiskey
• Ben Daily
• Jan Haaga
• Scott Van Sant
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 27
AKCRRAB Steering Committee
Dr. David Christie, Director, Alaska Sea Grant Program, University of Alaska Fairbanks, Co-chair
Heather McCarty, Central Bering Sea Fishermen’s Association, Co-chair
Dr. Ginny Eckert, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks
Dr. Robert Foy, Director, Kodiak Laboratory, National Marine Fisheries Service, NOAA
Jeff Hetrick, Director, Alutiiq Pride Shellfish Hatchery, Seward
Chris Mierzejek, Aleutian Pribilof Island Development Association
Rodger Painter, Alaskan Shellfish Growers Association
Jeff Stephan, Executive Director, United Fishermen’s Marketing Association, Kodiak
Gale Vick, Gulf of Alaska Coastal Communities Coalition (GOAC3)
AKCRRAB Science Committee
Dr. Ginny Eckert, School of Fisheries and Ocean Sciences, University of Alaska Fairbanks, Chair
Dr. David Christie, Director, Alaska Sea Grant Program, University of Alaska Fairbanks
Ben Daly, University of Alaska Fairbanks
Dr. Robert Foy, Director, Kodiak Laboratory, National Marine Fisheries Service, NOAA
Jeff Hetrick, Director, Alutiiq Pride Shellfish Hatchery, Seward
Dr. Chris Long, Kodiak Laboratory, National Marine Fisheries Service, NOAA
Doug Pengilly, Alaska Department of Fish and Game, Kodiak
Dr. Al Stoner, National Marine Fisheries Service, NOAA, Newport, Oregon
Jim Swingle, Research Biologist, Alutiiq Pride Shellfish Hatchery/Alaska Sea Grant Program
Dr. David Tallmon, University of Alaska Fairbanks/University of Alaska Southeast