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Algal dermatitis in cichlids.

Roy P E Yanong1, Ruth Francis-Floyd, Eric Curtis

  • 1Department of Fisheries and Aquatic Sciences, College of Agricultural and Life Sciences, University of Florida, Ruskin 33570, USA.

Journal of the American Veterinary Medical Association
|May 7, 2002
PubMed
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Algal dermatitis caused by Chlorochytrium spp. and Scenedesmus spp. affected ornamental cichlid fish in Florida. Standard algaecide treatments were unsuccessful in clearing the infections.

Area of Science:

  • Aquatic pathology
  • Ichthyology
  • Algology

Background:

  • Multifocal green lesions were observed in Pseudotropheus zebra populations on two Florida fish farms.
  • Infection rates ranged from 5 to 60%, with fish otherwise appearing clinically normal.

Purpose of the Study:

  • To diagnose the cause of green lesions in Pseudotropheus zebra.
  • To identify the specific algae involved and assess treatment efficacy.

Main Methods:

  • Diagnostic evaluation of affected fish.
  • Microscopic examination of lesions (fresh and fixed).
  • Identification of causative algal species.

Main Results:

  • Algal dermatitis was confirmed, with light internal organ invasion.

Related Experiment Videos

  • Farm A infected with Chlorochytrium spp.; Farm B infected with Scenedesmus spp.
  • Bath treatments with copper sulfate pentahydrate, diuron, and sodium chloride were ineffective.

    • Conclusions:

    • This is the first report of algal dermatitis in ornamental cichlids.
    • This is the first report of Scenedesmus spp. infection in any fish.
    • Algae located under scales and within the dermis, coupled with granulomatous response, may explain treatment failure.