Alaska King Crab Research

7/29/2019 Alaska King Crab Research

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Alaska King Crab Research,

Rehabilitation & Biology Program

An Introduction

Presented by Jeff HetrickDirector Alutiiq Pride Shellfish


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The AKCRRAB Science Team

Ginny Eckert UAF/UAS

Brad Stevens U. Mass. Dartmouth

Brian Allee Alaska Sea Grant

Jeff 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 Crab

Rehabilitation and EnhancementSymposium

1990s-2000s Extensive researchby 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 A


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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 ofenhancement

European lobster, NorwayCommercial sea ranchingvery 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 hatcherytrials

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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BKC Larval Handling Stress/Diet studyMay 14, 2007 June 12, 2007

Purpose:To test effects of live algae vs. algae

concentrate as dietary enrichmentand effect of handling stress onBKC larval survival and growth tothe glaucothoe stage.

Treatments:

Diet: Live T-ISO

Concentrate 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 concent


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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

We

ightinmilligrams

RKC BKC


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Average Temp. of RKC Larval Rearing Tanks

3

4

5

6

7

8

9

10

Duration of experiment

DegreesCelcius

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

Tem erature fluctuation Im rove water s stem

Excessive 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 juvenile

rearing is possible.

Tremendous accomplishment in areas of technologytransfer, hatchery setup, preliminary research andbaseline data.

Need to refine setup in identified ways to improvesurvival, as expected.

P. camtschaticus glaucotho


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AKCRRAB Long-term vision

Artificial PropagationHabitat Studies

Genetics & Pathology

Goal: Assess biological & economicfeasibility of red and blue king crabpopulation rehabilitation through oceanranching.


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The goal of this three year grant would be the development of productionand operation techniques (hatchery and nursery) with a positive

benefits/cost for producing juvenile king crab for release into the wild fromfacilities at Old Harbor

ANA King CrabRehabilitation/Enhancement Grant

Goal and Objectives


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1) Investigate and develop king crab hatchery/nursery techniques at

the Alutiiq Pride Shellfish Hatchery in Seward for producing king crabjuveniles with a 1 inch carapace length. This would include apreliminary marking program for identifying hatchery released crabrecovered in the wild.

2) Training for Old Harbor residents. This would include training for upto six residents in juvenile king crab hatchery and nursery productiontechniques to a level that would allow them to operate ahatchery/nursery system in Old Harbor under general supervision, andtraining for up to three residents in supervision and managementduties and responsibilities. This would include training for at least oneresident to become a certified diver who would assist in variousevaluation work associated with the project such as habitat surveys,identifying potential release sites and monitoring the progress of

released crab.


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3) Identify potential sites for a juvenile king crab production

facility in Old Harbor and produce design criteria forconstructing and equipping a hatchery/nursery system in OldHarbor with low capital and operating costs.

1) Conduct a benefit/cost analysis forhatchery/nursery production of juvenile king crab atOld Harbor.


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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

Red king crab (P. camtschaticus) eggs, Seward, Alaska

Alaska King Crab Research

Documents

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