stock enhancement in norway
Download
Skip this Video
Download Presentation
Stock Enhancement in Norway

Loading in 2 Seconds...

play fullscreen
1 / 25

Stock Enhancement in Norway - PowerPoint PPT Presentation


  • 132 Views
  • Uploaded on

Stock Enhancement in Norway. Experiences and activities in Norway and Europe, based on studies of the European lobster Homarus gammarus Gro I. van der Meeren , Halvor Knutsen , Jan Atle Knutsen , Ann- Lisbeth Agnalt and colleagues

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Stock Enhancement in Norway' - emily-olson


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
stock enhancement in norway

Stock Enhancement in Norway

Experiences and activities in Norway and Europe, based on studies of the European lobster Homarusgammarus

Gro I. van derMeeren, HalvorKnutsen, Jan AtleKnutsen, Ann-LisbethAgnalt and colleagues

Based on a presentation at RALBAM, Chennai, India 4-8 January 2010

slide2

Lobster fisheries in Norway and Europe

  • Rebuilding the lobster stock
    • Stock enhancement
      • Release protocols
      • Carrying capacity
      • Habitat
      • Recapture
      • Life in the sea
      • Juvenile quality
    • Marine protected areas
slide3

Releases

at Kvitsøy

1990 - 1994

1500

1000

Catch (tons)

500

0

1920

1930

1940

1950

1960

1970

1980

1990

2000

Year

Agnalt and Jørstad, 2002

Lobster fisheries in Norway

steps in lobster production
Steps in Lobster Production

Hatchery:

Larval rearing

Juvenile rearing

Ongrowth

Sea ranching:

Transportation

Release

Recapture

slide5

Juvenile rearing

Hatchery

Communal rearing

Photo: Eva Farestveit, IMR

Individual rearing

Photo: K. Jørstad, IMR

growth
Growth

Juvenile rearing

Hatchery

Communal rearing

Single rearing

Sea cages

Experiments by: Knut Jørstad, et al. 2001 (communal and single rearing)

G.I. van der Meeren, not published (sea cages)

juvenile rearing
Juvenile rearing

Hatchery

From leaflet by Norsk Hummer A/S

slide8

Juvenile rearing

Hatchery

”Lobster house” to place in the sea

Photo and patent rights: Aegir AS

slide9

Juvenile rearing

Hatchery

Construction: Helge Knudsen, IMR

Construction: Andreas Gjermundsen og

Espen Eriksen, NTNU

slide10

Release

Release procedures

From: Beard and Wickins 1992

releases in europe 1970 1995
Releases in Europe, 1970-1995

Country

Region

Duration

Years

Numbers

released

Age at

Age at

Age at

release

Recapture

Tot.

Tot.

%

Years of

Country

Location

Location

research

research

# Released

# Released

release

release

# Recapt.

# Recapt.

Recap.%

Recap.%

France

Up to 225 000

France

France

Bretagne

Bretagne

10

10

2-3 weeks

2-3 weeks

?

?

?

?

Weeks

Ireland

292 000

Ireland

Ireland

Along coast

Along coast

4

4

2-4 weeks

2-4 weeks

?

?

?

?

France

Gr.Britt.

Gr.Britt.

Gr.Britt.

Gr.Britt. Norway

25 480

France

France

Bretagne

5

5

~1 year

~1 year

22

22

0,09

0,09

Year

49 128

10

10

~1 year

~1 year

653

653

1,3

1,3

East England

19 233

"

"

Wales

10

10

453

453

2,4

2,4

3 044

"

"

W. Scotland

9

9

~1 year

~1 year

58

58

1,9

1,9

19 520

N. Scotland

"

"

9

9

~1 year

~1 year

307

307

1,6

1,6

7 950

Norway

Norway

9

9

~1 year

5 115

5 115

4

Kvitsøy

127 945

~1 year

6,2

10

Data: Ann-Lisbeth Agnalt, IMR

recaptures kvits y norway
Recaptures, Kvitsøy,Norway

Recapture period reported by Agnalt

et al.

1999

2,0

Male

88 Year Class

Released: 15 000

Female

Recaptured: 554

1,0

0,0

92

93

94

95

96

97

98

99

2000

2,0

89 Year Class

Released: 8 700

Recaptured: 841

1,0

0,0

92

93

94

95

96

97

98

99

2000

2,0

90 Year Class

Released: 29 700

Recaptured: 1 757

1,0

0,0

92

93

94

95

96

97

98

99

2000

Recapture (%) of each year class through time

2,0

91 Year Class

Released: 29 900

Recpatured: 2 405

1,0

0,0

92

93

94

95

96

97

98

99

2000

2,0

92 Year Class

Released: 11 800

1,0

Recaptured: 792

0,0

92

93

94

95

96

97

98

99

2000

2,0

93 Year Class

Released: 32 800

1,0

Recaptured: 1 224

0,0

*

*

92

93

94

95

96

97

98

99

2000

Recapture year (autumn and following spring)

Data:

Ann-Lisbeth Agnalt et al.,

IMR 2001

recaptures of annual clutches kvits y norway
Recaptures of annual clutches Kvitsøy, Norway

10

Release year

8

88

6

89

90

Cumulativ recapture

4

91

92

2

93

0

92-H

93-H

94-H

95-H

96-H

97-H

98-H

99-H

Data:

Ann-Lisbeth Agnalt et al.,

IMR 2000

Season

slide14

Life in the sea

CANO WP3 - Lobster

Aim:

Estimate carrying capacity (juvenile

density) in early stages, in releases with European lobster (enhancement/ranching)

Ann-Lisbeth Agnalt, Eva Farestveit, K.E. Jørstad

slide15

Life in the sea

Artificialshelters

Hartvig Christie, NIVA

artificial reefs in sweden

Life in the sea

Artificial reefs in Sweden

N. Egriell, M. Ulmestrand, J. Andersson, B. Gustafsson, T. Lundälv, C. Erlandsson, L. Jonsson, T. Ahsberg

Municipalauthorities og Gothenburg, Swedishshiptraficauthorities, GothenburgUniversity, Directorateof Fisheries EU

slide17

Juvenile quality

  • Genetics
  • Anatomy
  • Neurology
  • Fitness
  • Behaviour
slide18

Juvenile quality

Genetics

Jørstad et al., 2005

slide19

Juvenile quality

Morphology

van der Meeren & Uksnøy 2000

slide20

LPZ

56 m

Juvenile quality

Neurology

Lobster brain

BrdU-labelled lobster brain

van der Meeren et al, in prep

slide22

Juvenile quality

Fitness

Photo: Eva Farestveit, IMR

Photo: K. Jørstad, IMR

Jørstad, et al. 2009

slide23

Juvenile quality

Behaviour

Photo: T. van der Meeren

slide24

Life in the sea

From video by Eva Farestveit, IMR

ad