pacific white shrimp hatchery in biofloc system · pacific white shrimp hatchery in biofloc system...
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PACIFIC WHITE SHRIMP HATCHERY IN BIOFLOC SYSTEM
Delano Dias Schleder*, Marco Antônio Lorenzo, Efrayn Wilker Souza Candia, Priscila Cardoso Rezende, Felipe do Nascimento Vieira, Walter Quadros Seiffert
Introduction
Low temperature during winter (Jun-Sep)
Shrimp culture season (Sep-May)
Shrimp hatchery –Commercial Labs (Aug-...)
South of Brazil
IntroductionTraditional hatcheryAutotrophic system
High costWater heating and exchanging
Shrimp hatchery in Biofloc System
Less use of waterCost
Environmental impactBiosecurity
Biofloc microrganisms –feed supply to shrimp larvae
Environmental impactUse and discharge of water
Biosecurity problemsWater exchange
Introduction
Objective
The present work aimed to evaluate the hatchery performance of the Pacific white shrimp Litopenaeusvannamei in biofloc system under different C:N ratios.
MethodologyExperiment
- Biofloc System -
Autotrophicsystem
(Until Zoea III)
FromMysis I
Post-Larvae 57 days
60L U-shape tanks (200 larvae.L-1) Temp.: ± 29 °C Salin.: ±35 ppm No water exchange
C:N ratio - 10:1
C:N ratio – 12.5:1
C:N ratio - 15:1
Control group: C:N ratio – 12.5:1
Addition of dextrose ifammonia exceeded 1.0mg.L-1
Treatments(quadruplicate)
MethodologyExperiment – 7 days
- Biofloc System -Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7
FeedingSchedule
C. muelleri
(5.104
cels.ml-1) +
commerc. feed
(INVE) 48% CP –(9x/day)
commercfeed
(INVE) 48% CP –(9x/day)
+brine
shrimp nauplii(5x/day)
commercfeed
(INVE) 48% CP –(9x/day)
+brine
shrimp nauplii(5x/day)
commercfeed
(INVE) 48% CP –(9x/day)
+brine
shrimp nauplii(5x/day)
commercfeed
(INVE) 48% CP –(9x/day)
+brine
shrimp nauplii(5x/day)
commercfeed
(INVE) 48% CP –(9x/day)
+brine
shrimp nauplii(5x/day)
commercfeed
(INVE) 48% CP –(9x/day)
+brine
shrimp nauplii(5x/day)
DextroseAddition
4x/day
following the C:N ratios of
each treatment
4x/day
following the C:N ratios of
each treatment
4x/day
following the C:N ratios of
each treatment
4x/day
following the C:N ratios of
each treatment
4x/day
following the C:N ratios of
each treatment
4x/day
following the C:N ratios of
each treatment
4x/day
following the C:N ratios of
each treatment
MethodologyExperiment – 7 days
- Biofloc System -
WaterQuality*
AmmoniaNitriteNitrate
TSS / TVSAlkalinity
Temp.OxigenSalinity
pH
AmmoniaTSS / TVS
Temp.OxigenSalinity
pH
AmmoniaTSS / TVS
Temp.OxigenSalinity
pH
AmmoniaNitriteNitrate
TSS / TVSAlkalinity
Temp.OxigenSalinity
pH
AmmoniaTSS / TVS
Temp.OxigenSalinity
pH
AmmoniaTSS / TVS
Temp.OxigenSalinity
pH
AmmoniaNitriteNitrate
TSS / TVSAlkalinity
Temp.OxigenSalinity
pH
Performance
Day 1 Day 2 Day 3 Day 4 Day 5 Day 6 Day 7
Survivaland dryweight
*(Grasshoff et al., 1983; Strickland and Parsons, 1984; APHA, 2005)
Results and DiscussionWater quality parameters
* One-way ANOVA
Results and DiscussionWater quality parameters
* Repeated measures ANOVA
Results and DiscussionPerformance
* One-way ANOVA
Conclusion
Biofloc system using fixed C:N ratio of 12.5:1 is suitablefor hatchery of L. vannamei (from M1 to PL5), becauseit could facilitate pond management in comparison tothe carbon addition dependent on ammoniaconcentration, and spend less carbon source thanhigher C:N ratios.
Acknowledgments
