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January 26, 2016


Research—Removing Excess Bioflocs, Water Exchange or Settling Tanks?


From Abstract: Biofloc systems rely on microbial processes in the water column to recycle animal waste products, which increases biofloc concentrations and necessitates some form of biofloc removal.  An experiment was carried out to evaluate two management practices to control bioflocs.  Six tanks (48 m3) were divided into two treatments: water exchange and settling tanks.  Shrimp (0.67 grams) were stocked at 164 m2.  After 61 days of culture, shrimp in the settling-tank treatment had an average weight of 12.7 and survivals of 73.8%.  Those in the water exchange treatment had an average weight of 10.1 grams and survivals 57.8%.  Using the settling-tank strategy, 631 liters of water were necessary to produce one kilogram of shrimp.  Using the water exchange strategy, 1,150 liters of water were necessary to produce one kilogram of shrimp.  The results indicate that continuous operation of settling tanks can reduce variability in solids characteristics and water quality variables such as ammonia.  Both strategies are efficient in controlling the biofloc concentrations; however, settling tanks reduce water use and improve shrimp production.


Source: Aquaculture Research.   A Comparison Between Water Exchange and Settling Tank as a Method for Suspended Solids Management in Intensive Biofloc Technology Systems: Effects on Shrimp (Litopenaeus vannamei) Performance, Water Quality and Water Use.  Rafael Arantes (email, Department of Aquaculture, Federal University of Santa Catarina, Laboratório de Camarões Marinhos, Florianópolis, SC CEP 88062-601, Brazil), Rodrigo Schveitzer, Caio Magnotti, Katt Regina Lapa and Luis Vinatea.  Article First Published Online on January 21, 2016.

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