Ferron Lozano, David

Universitat Autònoma de Barcelona. Facultat de Veterinària

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THE BIOFLOC TECHNOLOGY IN AQUACULTURESince the 60’s, the fisheries capture production has reachedits limit. All the increase in the global fish production fromthen has been and has to be due to aquaculture.However this increase can not be at any cost, it has to besustainable at all levels.The aim of this review is to present and show the biofloctechnology (BFT) as a sustainable aquaculture system.David Ferron Lozano Veterinary Medicine School, UAB June 2017The BFT is more efficient and sustainable system  than the conventional ones in aquaculture when it comes to waste and nitrogen management.The BFT implies a better biotransformation for the reared organisms and allows to reduce the fishmeal amount in the formulated dietsIt is essential a constant mixing and aeration of the ponds.The BFT has a probiotic effect on the reared organisms. This fact and the reduction of the water changes enhance the biosecurity.Despite its proven advantages, there is a need for the producers and the consumers to change their perception about the turbid waters and feeding with microorganisms. Nitrogen Removal ProbioticReutilizationThe BFT is an alternative method ofwaste management inside the pond.The system relies on heterotrophicbacteria to transform the waste intofeed for the harvested organisms withminimal water exchange.A biofloc is a macroaggregate ofheterotrophic bacteria, algae,diatomea, protozoa and other organicmatter.Introduction and objectives The BIOFLOCConclusionsReferencesFeed (C & N)C & NH3 Microbial proteinNO3CO2 Carbon sourceFor each NH3 gram transformed to:O2 CO2Alkalinity (carbonate)BiomassAlgal biomass 15,4g - 18,07g / 15,85gNitrate - 4,18g 5,85g - 7,5g 0,2g 1Microbial biomass - 4,71g 9,65g - 3,57g 8,07g 2Main purposes of the BFT➢ Competition of space, substrateand nutrient against pathogenicbacteria.➢ Immunostimulation➢ Upregulation of 6 immunityrelated genesØ Water exchangeChange of perceptionBiosecurity↓ FishmealRisk of sedimentationMIXING AND AIREATIONMurky waterAllows to ↓↑ O2 Demand↓ Production costs↑ Suspended Solids% Crude ProteinAmount of feed↓ FCR↑ ADG↑ N retention➢ Bacterial based systems are much more stablethan algae based systems➢ Heterotrophic bacteria arex5 fasterx40 more efficientthan autotrophic bacteriaApplications of the BFT➢ Full Biofloc130-150 PL/m3 20-25 Tm/ha & cycle250-500 PL/m3 up to 50 Tm/ha & cycle ➢ Semi-Bioflocup to 15-16 Tm/ha & cycleSuitable culture speciesFig 1. Biofloc (Hargreaves 2013)Fig 2. BFT Scheme. Adapted from Avnimelech 2015 Table 1. Comparison of production and consumption of O2, CO2 , alkalinity and biomass for each NH3 gram transformed. Adapted from Ebeling et al. 2006↓ OverfishingLitopenaeus vannameiPenaeus monodonOreochromis niloticusCyprinius spp.Tinca tinca Anguilla anguillaAvnimelech, Y., 2015. Biofloc Technology - A Practical Guidebook 3rd Editio., Baton Rouge, Louisiana: World Aquaculture Society.Ebeling, J.M., Timmons, M.B. & Bisogni, J.J., 2006. Engineering analysis of thestoichiometry of photoautotrophic, autotrophic, and heterotrophic removal of ammonia-nitrogen in aquaculture systems. Aquaculture, 257(1–4), pp.346–358.Hargreaves, J.A., 2013. Biofloc production systems for aquaculture. SRAC Publication, 4503, pp.1–12. 

The biofloc technology in aquaculture

https://ddd.uab.cat/pub/tfg/2017/180967/TFG_dferronlozano_poster.pdf

The biofloc technology in aquaculture

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