Growth performance of mussel recruits on raft culture after Prestige oil spill Laura G. Peteiro,...
-
date post
20-Jan-2016 -
Category
Documents
-
view
221 -
download
0
Transcript of Growth performance of mussel recruits on raft culture after Prestige oil spill Laura G. Peteiro,...
Growth performance of mussel recruits on raft culture after Prestige oil spill
Laura G. Peteiro, José MF Babarro, Uxío Labarta & María José Fernández ReirizInstituto de Investigaciones Marinas CSIC, 36208 Vigo Spain
Phone: +34986 231930 Fax: +34986 292762 Email: [email protected]
From ENVISAT ASAR satellite on November 17 th, 2002
-PAH in mussel tissues -Physiological / Biochemical measurements (survival in air, biochemical composition)
Mussel characterization at seeding (February 2003) Labarta et al., MEPS 2005
Most affected area
Original locations ofmussel populations translated for experimental culture
Redes Miranda Pindo Bueu
Length (mm)
Total DW (g)
Length (mm)
Total DW (g)
Length (mm)
Total DW (g)
Length (mm)
Total DW (g)
Seeding 21,4±7.9 0,3±0.0 10,4±3.6 0,1±0.0 15,6±6.8 0,2±0.0 18,0±5.2 0,2±0.0
Thinning-out 50.6±10.1 4.1±0.3 46.8±6.2 3.2±0.0 44.7±7.5 2.5±0.0 52.2±7.2 4.8±0.4
Labarta et al., MEPS 2005
Corporal parameters at seeding and thinning-out
0 2 4 6 8 10 12
time (months)
0
10
20
30
40
50
60
70
80L
(mm
)
0 2 4 6 8 10 12
time (months)
0
2
4
6
8
10
12
tota
l DW
(g)
Growth curves in length and total dry weight fitted
to Gompertz model
Pt =P∞(e-e(-k*(t-t´)))
BueuRedesMirandaPindo
<2,4
**
0
2
4
6
8
10
Redes 1 Miranda 2 Pindo 3 Bueu 4
mm
/mon
th<2
<1,2,4
**
0
0,05
0,1
0,15
0,2
Redes 1 Miranda 2 Pindo 3 Bueu 4
g tis
sue
DW
/mon
th >1,2
>2
*
*
00,20,40,60,8
11,2
Redes 1 Miranda 2 Pindo 3 Bueu 4
g to
tal D
W/m
onth
<1,4
Seeding/Thinning-out
0
2
4
6
8
10
Redes 1 Miranda 2 Pindo 3 Bueu 4
mm
/mon
th
>3
* *
0
0,05
0,1
0,15
0,2
Redes 1 Miranda 2 Pindo 3 Bueu 4
g tis
sue
DW
/mon
th
>3,4
>1,3,4
* *
00,20,40,60,8
11,2
Redes 1 Miranda 2 Pindo 3 Bueu 4g
tota
l DW
/mon
th >3,4
Thinning-out/Harvest
Initial length/weight at seeding and thinning-out had no effect on growth rate (GR) (ANCOVA p>0.05)
Pindo showed the lowest weight GR in both phases of the culture (p<0.05)
Growth Rates
Seeding/Thinning-out Thinning-out/Harvest
0 2 4 6 8 10 12
time (months)
0
2
4
6
8
10
12
tota
l DW
(g)
DWt =DW∞(e-e(-k*(t-t´)))
<1,4
*
0
2
4
6
8
10
12
Redes 1 Miranda 2 Pindo 3 Bueu 4
DW∞
-0,9
-0,7
-0,5
-0,3
-0,1
0,1
Redes 1 Miranda 2 P indo 3 Bueu 4
<1,2
*
0,0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
Redes 1 Miranda 2 P indo 3 Bueu 4
>2
*
*
00,20,40,60,8
11,2
Redes 1 Miranda 2 Pindo 3 Bueu 4
g to
tal D
W/m
onth
<1,4
>1,3,4
* *
00,20,40,60,8
11,2
Redes 1 Miranda 2 Pindo 3 Bueu 4
g to
tal D
W/m
onth >3,4
Pindo DW∞
(p<0.05) Bueu t´(p<0.05)
BueuRedesMirandaPindo
Growth rates in total dry weight
0
5
10
15
20
25
30
35C
I
0
1
2
3
4
5
6
7
8
9
Ch
l-a
BueuRedesMirandaPindoChl a
CI is a weak parameter to determine stress situations:
- Nutritional state- Reproductive cycle- Pollution
Condition Index evolution along the culture
0
10
20
30
40
50
60
70
80
<50 mm 50 mm≤N<70 mm N≥70mm
Bueu
Redes
Miranda
Pindo
% indiv≥70mm lowest for Pindo mussels (p<0.05)
Yield at harvest
Comparison among mussel populations showed the following remarks:
% individuals ≥ 70 mm, lowest values for Pindo mussels
Lowest Total DW values at harvest for Pindo mussels
A poor commercial classification in pieces/kg
-
-
- Population from Pindo showed the lowest growth rate values in weight in both phases of the culture.
Preliminary Remarks:
- The maintenance of lower growth rates along the culture resulted in poorer commercial yield at harvest for Pindo mussels.
- The latter growth performance of Pindo mussels would be a sub-lethal effect that might reflect its worse physiological and biochemicalconditioning (lipid classes, fatty acids)monitored at the onset of the culture by Labarta et al., (MEPS 2005).