Siderophore detection among bacteria associated with the epizootic ulcerative syndrome (EUS)

Abstract

Sixteen isolates of Aeromonas hydrophila andone isolate each of Aeromonas sp. n., Aquaspirillum sp., Pseudomonas sp., and Streptococcus sp., isolated from normal, apparently normal and epizootic ulcerative syndrome (EUS)-affected fish were screened for siderophore production at 20, 25, 30, and 37^oC. results showed that siderophore production of A. hydrophila and Aeromonas sp. n. isolates decreased with increasing temperature. Among A. hydrophila isolates, 81.2% produced siderophore at 20^oC, 50% at 25 and 30^oC, and only 37.5 at 37^oC. In contrast, Aquaspirillum sp., Pseudomonas ep., and Streptococcus sp., showed higher production of siderophore at 30 and 37^oC.