May/June 2010 - Global Aquaculture Alliance

Community • Environment
• Food Safety • Traceability
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and isoleucine. The biofloc protein level can
be increased to about 65%, and the quality
of the essential amino acids profile in biofloc
can be further optimized by changing
the effluent used, bioreactor methodology
and/or carbon source and level.
Feeding Trials
Two feeding trials were conducted to
determine if biofloc can be used to
replace fishmeal and/or soybean protein
in shrimp diets. Each five-week trial was
conducted in recirculating aquaculture
systems with optimal water quality conditions
for shrimp culture.
The bioflocs were dried and incorporated
into experimental diets formulated
to be equivalent for crude protein (35%)
and total fat (8%). The biofloc diets were
compared against high-quality control
diets by replacing fishmeal and/or soy
Composition (% dry-matter basis)
3.0
2.5
2.0
1.5
1.0
0.5
0
Leucine
Lysine
Arginine
Valine
Isoleucine
protein. In the first trial, only SBR bioflocs
were tested. Both SBR and MBR
bioflocs were used in the second trial at
twice the inclusion rate of the first trial.
The weight gain of shrimp in the trials is
presented in Figure 2.
Shrimp fed biofloc diets during the
first trial outgrew shrimp given the control
diet by an average of 49%. During
the second trial, shrimp on biofloc diets
outgrew the control shrimp by approximately
10%.
Regardless of the inclusion rate of
total diet (0 to 30%), amount of fishmeal
replaced (0 to 67%) or soy protein
replaced (0 to 100%), shrimp fed biofloc
diets grew slightly or significantly faster.
These data suggested that bioflocs can be
a suitable, if not superior, ingredient for
shrimp feed.
Phenylalanine
Threonine
Biofloc
Typical Feed
Methionine
Histidine
Tryptophan
Figure 1. Essential amino acid profiles of a representative biofloc ingredient versus typical
high-quality shrimp feed.
Average weight Gain (g)
9
8
7
6
5
4
3
2
1
0
Trial 1 Trial 2
Control
SBR 8%
SBR 16%
Control
SBR 10%
SBR 15%
SBR 21%
MBR 10%
MBR 15%
MBR 21%
MBR 30%
Figure 2. Weight gain of shrimp fed diets with bioflocs from a sequencing batch reactor
(SBR) or membrane batch reactor (MBR) over five weeks.
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• Best Aquaculture Practices & Traceability
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If you would like to learn more about Pescanova USA representing your products, contact us today 800-990-6292 x 7020
or via e-mail- sales@pescanovausa.com. Visit us online at pescanovausa.com
76 May/June 2010 global aquaculture advocate global aquaculture advocate May/June 2010 77
GUYANA PINKS