choosing effective technologies to develop offshore mussel ... · 50 >50-55 >55-60 >60-65...
TRANSCRIPT
John Bonardelli, Shellfish Solutions AS Offshore Mussel Farming: 7 Feb’11
Choosing Effective Technologies to
Develop Offshore Mussel Culture
Offshore and 400 submerged lines
Offshore double lines
Shellfish Solutions AS
Move offshore requires a re.think
Must produce more with less!
A) Continuous socking – What are the options?
B) What didn’t work - not always fault of socking!
Materials, methods, flotation
C) Practical issues that impact on sock yields
Quality socking
Adapted flotation
Benefits of Sampling
A) Continuous socking – What are the options?
Shellfish Solutions AS
Going from manual verticaltube socks to continuous
Testing efficiency with scale-up to higher output
A) Continuous socking – What are the options?
Shellfish Solutions AS
Spanish continuous: easy use of more size ranges anytime
Increasing efficiency with scale-up to higher output
Use more months, since seed does not need to move out
A) Continuous socking – What are the options?
Shellfish Solutions AS
Automatic continuous: High output, more sizes anytime
Increasing efficiency with scale-up, least labour required
Use more months of year, reusable, mechanized, fast
Materials & methods
Socking Mishaps
Winter storm + floatationWrong timing for socking
Wrong densities
B) What didn’t work - not always fault of socking!
Good sock methods not always enough
0
5
10
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60
Apr-01 Aug-01 Dec-01 Apr-02 Aug-02 Nov-02 Mar-03 Jul-03 Nov-03 Mar-04 Jul-04 Nov-04
Me
an
sh
ell le
ng
th (
mm
)
Portion of collectors socked - (no size grading)
0
10
20
30
>10-
15
>15-
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>20-
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>25-
30
>30-
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>35-
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>40-
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>45-
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>50-
55
>55-
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>60-
65
% fre
qu
en
cy
No difference in growth or yield: poor grading is wrong method!
B) What didn’t work - not always fault of socking!
1) Use of wrong floatation technologies can decrease
yields & profits, increase costs!
Should use right floats to hold mussels, get maximum yields and value!
B) What didn’t work - not always fault of socking!
c) Practical examples that improve sock yields
Shellfish Solutions AS
Adapted floatation is cost-effective
Killary Harbour -Galway
Roaring water -Cork
c) Practical examples that improve sock yields
Sampling to compare JFC and thin-walled floats
Do costlier JFC floats really increase commercial value growers?
Measured
size distribution
density
commercial biomass (yield)
fall-off
time to market
c) Practical examples that improve sock yields
Typical biomass differences with JFC-ribbed vs barrel floats
Larger size
Higher densities
30-50mm
-800+ vs 238 /m
-35% vs 3% comm
Faster growth
Less fall-off
Commercial yields
10-30% > / JFC line
Outer-02-A(end) 1m (Pegolini 8mm JFC)
Density/m 1020
Size class % of total No. Shells/ m
Klasse mm % frekvens ## Salgbar /m
>10-15 0,0 0
>15-20 1,9 19
>20-25 4,8 49
>25-30 3,8 39
>30-35 21,0 214
>35-40 33,3 340
>40-45 27,6 282
>45-50 6,7 68
>50-55 1,0 10
>55-60 0,0 0
>60-65 0,0 0
>65-70 0,0 0
>70++ 0,0 0
sum 100,0 1020 /m
337 /ft
10<35mm 31 % 321 /m
40<70mm 35 % 360 /m
Outer-01-A(end) 1m (Pegolini 8mm ROM)
Density/m 413
Size class % of total No. Shells/ m
Klasse mm % frekvens ## Salgbar /m
>10-15 0,9 4
>15-20 5,5 23
>20-25 13,6 56
>25-30 22,7 94
>30-35 40,9 169
>35-40 13,6 56
>40-45 2,7 11
>45-50 0,0 0
>50-55 0,0 0
>55-60 0,0 0
>60-65 0,0 0
>65-70 0,0 0
>70++ 0,0 0
sum 100,0 413 /m
136 /ft
10<35mm 84 % 346 /m
40<70mm 3 % 11 /m
Outer-02-A(end), Online Mussel, DIS: 01-jul-09 Sampled: 10-des-09 (5,4 mon.-start)"
0
10
20
30
40
50
0-5 >5-10 >10-
15
>15-
20
>20-
25
>25-
30
>30-
35
>35-
40
>40-
45
>45-
50
>50-
55
>55-
60
>60-
65
>65-
70
>70
Density: (1020/m) 1m (Pegolini 8mm JFC) MeanSize: (37,3 mm)
% F
rek
ven
s
Outer-01-A(end), Online Mussel, DIS: 01-jul-09 Sampled: 10-des-09 (5,4 mon.-start)"
0
10
20
30
40
50
0-5 >5-10 >10-
15
>15-
20
>20-
25
>25-
30
>30-
35
>35-
40
>40-
45
>45-
50
>50-
55
>55-
60
>60-
65
>65-
70
>70
Density: (413/m) 1m Pegolini 8mm ROM MeanSize: (30 mm)
% f
req
uen
cy
ASK-B-01-C, Afjord, Utsett: 13-des-05 Prøve: 13-nov-07 (23,3 mo.-start)"
0
10
20
30
40
50
0-5 >5-10 >10-15 >15-20 >20-25 >25-30 >30-35 >35-40 >40-45 >45-50 >50-55 >55-60 >60-65 >65-70 >70
Tethet: (969/m) z=1m SVKB EXP.high Middel: (40,2 mm)
% F
rekven
s 556 salgbar skjell/m
ASK-B-01-C, Afjord, Utsett: 13-des-05 Prøve: 13-nov-07 (23,3 mo.-start)"
0
10
20
30
40
50
0-5 >5-10 >10-15 >15-20 >20-25 >25-30 >30-35 >35-40 >40-45 >45-50 >50-55 >55-60 >60-65 >65-70 >70
Tethet: (520/m) z=3m SVKB EXP.high Middel: (45,8 mm)
% F
rek
ven
s 357 salgbar skjell/m
ASK-B-01-C, Afjord, Utsett: 13-des-05 Prøve: 13-nov-07 (23,3 mo.-start)"
0
10
20
30
40
50
0-5 >5-10 >10-15 >15-20 >20-25 >25-30 >30-35 >35-40 >40-45 >45-50 >50-55 >55-60 >60-65 >65-70 >70
Tethet: (543/m) z=5m SVKB EXP Middel: (47,2 mm)
% f
req
uen
cy 407 salgbar skjell/m
Sampling socks at different depth- know what harvest!
Sampling your offshore sites is key:Know when/why mussels give higher value & select quality
When better declumping-grading Use Narrow size range Use proper sock rope
Get: High % commercial yields Better control of fouling Cost-effective harvest Better risk management
Automatic socking allows for
rapid response: import spat,
fouling, 2nd set, depth unlimited,
Play w density- all same material
Thank you
Shellfish Solutions AS
Norway 7020
(47) 986 96 650
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Shellfish Solutions AS