Aquacosm Is Nutrient D eficiency the Reason for
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Aquacosm Is Nutrient Deficiency the Reason for Quality Decrease in Turbot Fry Over the Season? Jepsen, P. M. 1 * , Blanda, E. 1 , Jakobsen, H. H. 2 , Novac, A. 3 , Pedersen, A. T. 4 & Hansen, B. W. 1 1. Department of Environmental, Social, and Spatial Change, Roskilde University, 4000, Roskilde, Denmark 2. Department of Bioscience, Aarhus University, 4000 Roskilde, Denmark 3. Faculty of Biology, ”Alexandru Ioan Cuza” University of Iasi, 700507, Romania 4. Maximus A/S, 7755, Bedsted Thy, Denmark Background: A classical food chain was established, producing live feed for turbot larvae, in 3 replicate 280 m 3 open top mesocosm tanks in three successive production cycles throughout May to September 2011 in Denmark 56°N. Ph.d. student Per M. Jepsen [email protected] Roskilde University Denmark Conclusion: Nutrient depletion controls the classical food chain and decreased the phyto- and zooplankton biomass, resulting in a reduced turbot larvae survival This work was funded by IMPAQ grant (J. no. 10-093522) to Professor Benni W. Hansen, CommScie – POSDRU/89/1.5/S/63663 to Ph.D. Aliona Novac and Eliteforsk travel grant (J. no. 11-116388) to Ph.D. student Per M. Jepsen. 1 2 3 18% 12% 4% 3.5% 2.4% 9.6% Survi val Defect s Prod. cycle Inorganic nutrients Phytoplankton biomass Copepod abundance Survi val Defect s Prod. cycle Survi val Defect s Prod. cycle Fish larvae characteristics spp. Centropages hamatus production cycle 1 16/05 23/05 30/05 06/06 13/06 20/06 D IN & S i(µm olL -1 ) 0 5 10 15 20 D IP (µm olL -1 ) 0,0 0,5 1,0 1,5 2,0 2,5 3,0 Production cycle 1 23/05 30/05 06/06 13/06 20/06 Abundance [Ind.L -1 ] 0 100 200 300 400 Production cycle 2 23/07 27/07 31/07 04/08 08/08 12/08 Abundance [ind. L -1 ] 0 100 200 300 400 AdultL-1 C opepodite L-1 nauplii L-1 Eggs L-1 Production cycle 3 20/08 24/08 28/08 01/09 05/09 A bundance [Ind L -1 ] 0 100 200 300 400 production cycle 2 date 25/07 29/07 02/08 06/08 10/08 14/08 D IN & Si (µm ol L -1 ) 0 5 10 15 20 D IP (µm ol L -1 ) 0,0 0,5 1,0 1,5 2,0 2,5 3,0 W ateradded to the tanks production cycle 3 17/08 21/08 25/08 29/08 02/09 D IN & Si (µm ol L -1 ) 0 5 10 15 20 D IP (µm ol L -1 ) 0,0 0,5 1,0 1,5 2,0 2,5 3,0 N utrients added to the tanks 16/5 23/5 30/5 6/6 13/6 20/6 µg C hl a 0 5 10 15 20 25 Production cycle 1 25/7 1/8 8/8 15/8 22/8 µg C hl a 0 5 10 15 20 25 Production cycle 2 15/8 22/8 29/8 5/9 12/9 19/9 µg C hl a 0 5 10 15 20 25 Production cycle 3 date vs D IN DIP Si green Diatom Crypto Bluegreen
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Aquacosm Is Nutrient D eficiency the Reason for Quality D ecrease in Turbot F ry Over the Season ? Jepsen, P. M. 1 * , Blanda, E. 1 , Jakobsen, H. H. 2 , Novac, A. 3 , Pedersen, A. T. 4 & Hansen, B. W. 1 - PowerPoint PPT Presentation
Transcript of Aquacosm Is Nutrient D eficiency the Reason for
Aquacosm
Is Nutrient Deficiency the Reason for Quality Decrease in Turbot Fry Over the Season?
Jepsen, P. M.1*, Blanda, E.1, Jakobsen, H. H.2, Novac, A.3, Pedersen, A. T.4 & Hansen, B. W.1
1. Department of Environmental, Social, and Spatial Change, Roskilde University, 4000, Roskilde, Denmark2. Department of Bioscience, Aarhus University, 4000 Roskilde, Denmark3. Faculty of Biology, ”Alexandru Ioan Cuza” University of Iasi, 700507, Romania4. Maximus A/S, 7755, Bedsted Thy, Denmark
Background: A classical food chain was established, producing live feed for turbot larvae, in 3 replicate 280 m3 open top mesocosm tanks in three successive production cycles throughout May to September 2011 in Denmark 56°N.
Ph.d. studentPer M. [email protected] UniversityDenmark
Conclusion: Nutrient depletion controls the classical food chain and decreased the phyto- and zooplankton biomass, resulting in a reduced turbot larvae survival
This work was funded by IMPAQ grant (J. no. 10-093522) to Professor Benni W. Hansen, CommScie – POSDRU/89/1.5/S/63663 to Ph.D. Aliona Novac and Eliteforsk travel grant (J. no. 11-116388) to Ph.D. student Per M. Jepsen.
1
2
3
18%
12%
4%
3.5%
2.4%
9.6%
Survival DefectsProd. cycleproduction cycle 1
16/05 23/05 30/05 06/06 13/06 20/06
DIN
& S
i (µm
ol L
-1)
0
5
10
15
20
DIP
(µm
ol L
-1)
0,0
0,5
1,0
1,5
2,0
2,5
3,0Production cycle 1
23/05 30/05 06/06 13/06 20/06
Abu
ndan
ce [I
nd. L
-1]
0
100
200
300
400
Production cycle 2
23/07 27/07 31/07 04/08 08/08 12/08
Abu
ndan
ce [i
nd. L
-1]
0
100
200
300
400
Inorganic nutrients Phytoplankton biomass Copepod abundanceAdult L-1 Copepodite L-1 nauplii L-1 Eggs L-1
Production cycle 3
20/08 24/08 28/08 01/09 05/09
Abu
ndan
ce [I
nd L-1]
0
100
200
300
400
production cycle 2
date
25/07 29/07 02/08 06/08 10/08 14/08
DIN
& S
i (µm
ol L
-1)
0
5
10
15
20
DIP
(µm
ol L
-1)
0,0
0,5
1,0
1,5
2,0
2,5
3,0
Water added to the tanks
production cycle 3
17/08 21/08 25/08 29/08 02/09
DIN
& S
i (µm
ol L
-1)
0
5
10
15
20
DIP
(µm
ol L
-1)
0,0
0,5
1,0
1,5
2,0
2,5
3,0
Nutrients added to the tanks
16/5 23/5 30/5 6/6 13/6 20/6
µg C
hl a
0
5
10
15
20
25
Production cycle 1
25/7 1/8 8/8 15/8 22/8
µg C
hl a
0
5
10
15
20
25Production cycle 2
15/8 22/8 29/8 5/9 12/9 19/9
µg C
hl a
0
5
10
15
20
25Production cycle 3
date vs DIN DIPSi
greenDiatomCryptoBluegreen
Survival DefectsProd. cycle
Survival DefectsProd. cycle
Fish larvae characteristics
Acartia spp.
Centropages hamatus
Centropages hamatus
Acartia spp.
Acartia spp
Centropages hamatus
