Stock Enhancement in Norway
description
Transcript of 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
Based on a presentation at RALBAM, Chennai, India 4-8 January 2010
Stock Enhancement in Norway
• 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
Releases at Kvitsøy
1990 - 1994
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1920 1930 1940 1950 1960 1970 1980 1990 2000
Agnalt and Jørstad, 2002Year
Catc
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Lobster fisheries in Norway
Hatchery:Larval rearing
Juvenile rearingOngrowth
Sea ranching:Transportation
ReleaseRecapture
Steps in Lobster Production
Photo: Eva Farestveit, IMR
Photo: K. Jørstad, IMR
Individual rearing
Communal rearing
Juvenile rearingHatchery
Growth
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Se pt. OKt. Nov. Des
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Bur I s jøen R om Felleskar
Experiments by: Knut Jørstad, et al. 2001 (communal and single rearing) G.I. van der Meeren, not published (sea cages)
Communal rearing
Sea cagesSingle rearing
Juvenile rearingHatchery
From leaflet by Norsk Hummer A/S
Juvenile rearingHatchery
Photo and patent rights: Aegir AS
”Lobster house” to place in the sea
Juvenile rearingHatchery
Construction: Andreas Gjermundsen ogEspen Eriksen, NTNU
Construction: Helge Knudsen, IMR
Juvenile rearingHatchery
From: Beard and Wickins 1992
ReleaseRelease procedures
Releases in Europe, 1970-1995
Data: Ann-Lisbeth Agnalt, IMR
Years ofAge at Tot.
CountryLocationresearch# Releasedrelease# Recapt. Recap.%France Bretagne 10 2-3 weeks ? ?IrelandAlong coast 4 2-4 weeks ? ?France 5 ~1 year 22 0,09
10 ~1 year 653 1,3 " 10 453 2,4 " 9 ~1 year 58 1,9 " 9 ~1 year 307 1,6Norway 9 ~1 year 5 115 4
Age at Tot.Locationresearch# Releasedrelease# Recapt. Recap.%
France Bretagne 10 Up to 225 0002-3 weeks ? ?IrelandAlong coast 4 2-4 weeks ? ?France 5 ~1 year 22 0,09
10 ~1 year 653 1,3 " 10 453 2,4 " 9 ~1 year 58 1,9 " 9 ~1 year 307 1,6Norway
Bretagne
Wales
N. ScotlandKvitsøy
East England
W. Scotland
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292 00025 48049 12819 2333 044
19 520127 945 ~1 year 5 115 6,2
CountryRegion Duration Years
Numbersreleased
Age atrelease
Recapture %
FranceIreland
FranceGr.Britt.Gr.Britt.Gr.Britt.Gr.Britt. Norway
Weeks
Year
7 950
10
Recaptures, Kvitsøy,Norway
Data:Ann-Lisbeth Agnalt et al.,IMR 2001
88 Year ClassReleased: 15 000Recaptured: 554
0,0
1,0
2,0
92 93 94 95 96 97 98 99 2000
Male
Female
90 Year ClassReleased: 29 700
Recaptured: 1 757
0,0
1,0
2,0
92 93 94 95 96 97 98 99 2000
91 Year ClassReleased: 29 900
Recpatured: 2 405
0,0
1,0
2,0
92 93 94 95 96 97 98 99 2000
92 Year ClassReleased: 11 800Recaptured: 792
0,0
1,0
2,0
92 93 94 95 96 97 98 99 2000
93 Year ClassReleased: 32 800
Recaptured: 1 224
0,0
1,0
2,0
92 93 94 95 96 97 98 99 2000
89 Year ClassReleased: 8 700Recaptured: 841
0,0
1,0
2,0
92 93 94 95 96 97 98 99 2000
Rec
aptu
re (%
) of e
ach
year
cla
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roug
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Recapture period reported by Agnalt et al. 1999
Recapture year (autumn and following spring)
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92-H 93-H 94-H 95-H 96-H 97-H 98-H 99-H
Season
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capt
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888990919293
Data:
Ann-Lisbeth Agnalt et al.,
IMR 2000
Recaptures of annual clutches Kvitsøy, Norway
Release year
CANO WP3 - Lobster
Estimate carrying capacity (juvenile
density) in early stages, in releases with European lobster (enhancement/ranching)
Ann-Lisbeth Agnalt, Eva Farestveit, K.E. Jørstad
Life in the sea
Aim:
Hartvig Christie, NIVA
Life in the seaArtificial shelters
Artificial reefs in SwedenN. Egriell, M. Ulmestrand, J. Andersson, B. Gustafsson, T. Lundälv, C.
Erlandsson, L. Jonsson, T. Ahsberg
Municipal authorities og Gothenburg, Swedish ship trafic authorities, GothenburgUniversity, Directorate of Fisheries EU
Life in the sea
Juvenile quality
GeneticsAnatomyNeurologyFitnessBehaviour
Juvenile qualityGenetics
Jørstad et al., 2005
Juvenile qualityMorphology
van der Meeren & Uksnøy 2000
Lobster brainBrdU-labelled lobster brain
LPZ
56 m
Juvenile quality
van der Meeren et al, in prep
Neurology
Neurogenesis and growth in cultivated lobster juveniles
Juvenile quality
van der Meeren et al, in prep
Neurology
FitnessJuvenile quality
Photo: Eva Farestveit, IMR
Photo: K. Jørstad, IMR
Jørstad, et al. 2009
Juvenile qualityBehaviour
Photo: T. van der Meeren
Life in the sea
From video by Eva Farestveit, IMR
Thank you