Sodium fluorescein for early detection of skin ulcers in Aeromonas hydrophila infected Piaractus mesopotamicus
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The increase in aquaculture global fish production has been associated with an increase in infectious diseases affecting aquacultured species.. The aim of this study was to identify ulcers in pacu (Piaractus mesopotamicus) with sodium fluorescein before it was possible to observe them visually. Twenty one fish with no apparent skin lesions were divided into three groups. Group 1 were injected with saline 0.65% (Group 1), Group 2 with 6 × 108 CFU oif Aeromonas hydrophila and group 3 with 6 x 108 CFU of Streptococcus agalactiae into the peritoneal cavity. All animals showed a positive reaction to fluorescein. A. hydrophila infected fish presented with large round marks with irregular borders, the characteristic ulcers caused by this agent. However, the other groups only displayed markings associated with handling caused by the netting procedures. We concluded that sodium fluorescein may be useful for an early and fast evaluation of cutaneous infection of A. hydrophila in pacu.
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