Transient development of filamentous Thiothrix species in a marine sulfide oxidizing, denitrifying fluidized bed reactor

Eddie Cytryn, Dror Minz, Armin Gieseke, Jaap Van Rijn*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

In this study, microscopic and molecular microbial analyses were integrated to characterize rapidly developing white filamentous tufts in a fluidized bed reactor used for nitrate removal from a marine recirculating fish culture system. Formation and rapid elongation of the tufts (often exceeding 50 mm day -1) was strongly correlated to transient elevated sulfide concentrations (>50 μM) in the reactor. The dominant bacterial constituents of these tufts were filamentous gram-negative bacteria with densely packed intracellular sulfur granules. Using 16S rRNA gene analysis and fluorescence in situ hybridization it was found that these filamentous bacteria represented a novel Thiothrix phylotype closely related (97% sequence identity) to a previously identified Thiothrix strain endogenous to the marine crustacean Urothoe poseidonis. In addition to filamentous morphotypes, rosette-shaped morphotypes of Thiothrix were also detectable within the tufts.

Original languageAmerican English
Pages (from-to)22-29
Number of pages8
JournalFEMS Microbiology Letters
Volume256
Issue number1
DOIs
StatePublished - Mar 2006

Keywords

  • Aquaculture
  • Fluorescent in situ hybridization
  • Sulfide oxidation
  • Thiothrix

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