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March 7, 2016


Research—Copepods and Bioflocs


From Abstract: This study evaluated the contribution of three diatom species to the lipid content of bioflocs, their permanence in the bioflocs and their influence on the growth performance of juvenile shrimp.  Juvenile of Penaeus vannamei were reared (30 days; three replicates per treatment) in biofloc systems inoculated with the diatoms Amphora coffeaeformis (A), Cylindrotheca closterium (C), Conticribra weissflogii (W), or biofloc only (BF, chlorophycean rich).  Water quality parameters were monitored daily, and the microbiota was checked on days 1, 10, 20 and 30.  The lipid content and fatty acid profiles of bioflocs were analyzed at the end of the experiment.


Shrimp survival rate (99%) in treatment A was significantly higher than in the biofloc only treatment (BF), and the bioflocs in treatment A had the highest lipid content, differing significantly from the BF and W treatments.  The content of eicosapentaenoic acid (20:5) (n-3), an omega-3 fatty acid, was significantly higher in A and lower in BF, while linoleic acid (18:2) (n-6) was significantly higher in BF.


The results indicate that a high cell density of diatoms can be successfully maintained with silicate addition in biofloc systems and that the A. coffeaeformis and C. weissflogii were potentially better suited than the C. closterium as food supplements for shrimp diets in biofloc nurseries system.


Source: Aquaculture Research.  The Contribution of Diatoms to Bioflocs Lipid Content and the Performance of Juvenile Litopenaeus Vannamei (Boone, 1931) in a BFT Culture System.  Tatiana G. Martins, Clarisse Odebrecht, Luciano V. Jensen, Marcelo GM D’Oca and Wilson Wasielesky, Jr. (Email Post-graduation Course on Aquaculture, Oceanography Institute, Federal University of Rio Grande, Rio Grande, Brazil).  Volume 47, Issue 4, Pages 1315-1326, April 2016.

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