seaweed cultivation in norway- ecology and strategy...seaweed cultivation in norway- ecology and...
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Seaweed cultivation in Norway- ecology and strategy
Silje ForbordSIG Seaweed Trondheim 27.11.19
Important aspects of seaweed cultivation
• High yield
Important aspects of seaweed cultivation
• High yield
• Good quality
Important aspects of seaweed cultivation
• High yield
• Good quality• Right biochemical composition
Important aspects of seaweed cultivation
Broch et al., 2019
• High yield
• Good quality• Right biochemical composition
• Site selection
Important aspects of seaweed cultivation
• High yield
• Good quality• Right biochemical composition
• Site selection• Deployment and harvest time
Important aspects of seaweed cultivation
• High yield
• Good quality• Right biochemical composition
• Site selection• Deployment and harvest time
• Cultivation depth
Important aspects of seaweed cultivation
• High yield
• Good quality• Right biochemical composition
• Site selection• Deployment and harvest time
• Cultivation depth
• Seedling size and density
Case 1: Latitude, season
and depth
• A selection of commercial farms over 10 degrees in latitude
• 3 fjord locations
• One hatchery producing seed lines• Deployment in February 2017
• 1-2 m and 8-9 m depths
• Sampling from April-Sept • Growth• Chemical content• Biofouling
Forbord, Matsson et al., under revision
Cultivation and monitoring program
1-58°N
Feb Mar Apr May Jun Jul Aug Sep
Fron
d le
ngth
(cm
)
0
20
40
60
80
100
120
Biom
ass
yiel
d (k
g m
-1)
0
2
4
6
8
10
12
14
16
18Length 1-2 m Length 8-9 m Biomass 1-2 m Biomass 8-9 m
6-63°N
Feb Mar Apr May Jun Jul Aug Sep
Fron
d le
ngth
(cm
)
0
20
40
60
80
100
120
Biom
ass
yiel
d (k
g m
-1)
0
2
4
6
8
10
12
14
16
18Length 1-2 m Length 8-9 m Biomass 1-2 m Biomass 8-9 m
Forbord, Matsson et al., under revision
9-69°N
Feb Mar Apr May Jun Jul Aug Sep
Fron
d le
ngth
(cm
)
0
20
40
60
80
100
120
Biom
ass
yiel
d (k
g m
-1)
0
2
4
6
8
10
12
14
16
18Length 1-2 m Length 8-9 m Biomass 1-2 m Biomass 8-9 m
Variation in protein content along a latitudinal gradient
BiofoulingLow salinity
South North
1-2 m8-9 m
Forbord, Matsson et al., under revision
Cover of biofouling
South North
Forbord, Matsson et al., under revision
• Low biofouling at 1-2 m cultivation depth
• High protein content at deeper depths• Poor growth in frond length and biomass
yield
Forbord, Matsson et al., under revision
Feb Mar Apr May Jun Jul Aug Sep
Fron
d le
ngth
(cm
)
0
10
20
30
40
50
601-2 m8-9 m
Low salinity strongly influence the biomass
Low salinity strongly influence the biomass1-2 m cultivation depth, before biofouling settlement
Case 2: Seeding methods and hatchery period
S: Incubation for 21, 28 and 42 days
GF: Incubation for 14 and 0 days
D: Culture for 28, 35 and 42 days
Forbord et al. 2019
G: Incubation for 14, 21 and 28 days
• Deployment in February 2018• Registrations in May and June
• Length• Width• Protein• Biomass (June)• Density (June)
Forbord et al. 2019
Can manipulate size and biomass… But probably not protein content
Seeded with glue0-42 days in culture
Spores and gam 14-28 days in hatchery
Spores and gam 14-28 days in hatchery
Spores 42 days
Spores 42 days
Seeded with glue0-42 days in culture
Forbord et al. 2019
• Several measures to influence the yield, quality and biochemical composition• Choose sites with high salinity or cultivate deeper than the freshwater layer• Know your site!
Thanks to:
• Sanna Matsson (Akvaplan-niva)
• Aleksander Handå (SINTEF)
• Ole Jacob Broch (SINTEF)
• Kristine B. Steinhovden (SINTEF)
• Torfinn Solvang (SINTEF)
• Guri E. Brodahl (NTNU)
• Bodil Bluhm (UiT)
• Anna Metaxas (Dalhousie Uni)
• Malin Kleppe (IMR)
• Arne Duinker (IMR)
• Jorunn Skjermo (SINTEF)
• Yngvar Olsen (NTNU)