alaska king crab research.ppt

7/27/2019 Alaska King Crab Research.ppt

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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

alaska king crab research.ppt

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