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Exophiala pisciphila. A study of its development.
Mycopathologia
|March 1, 1986
Summary
A novel black yeast, Exophiala pisciphila, was identified in dogfish skin lesions. This study details its development and updates the list of fish susceptible to Exophiala infections.
Area of Science:
- Mycology
- Marine Biology
- Fish Pathology
Background:
- Exophiala pisciphila is a dematiaceous fungus, classified among 'black yeasts'.
- This specific isolate was discovered on the skin of a smooth dogfish (Mustelus canis) born in an aquarium setting.
Purpose of the Study:
- To investigate the developmental stages, morphology, and surface structures of Exophiala pisciphila conidia and mycelium.
- To update the known range of marine and freshwater fish species affected by Exophiala species and similar fungi.
Main Methods:
- Light microscopy and scanning electron microscopy were employed to examine fungal morphology.
- Comparative analysis of growth on various media, including Potato Dextrose Agar, Malt Agar, and Corn Meal Agar.
Main Results:
- Detailed morphological characteristics of Exophiala pisciphila were illustrated, highlighting polymorphic conidiogenesis.
- Potato Dextrose Agar and Malt Agar were found to be optimal for fungal growth.
- Corn Meal Agar proved superior for observing conidial and mycelial development.
Conclusions:
- Exophiala pisciphila represents a significant fungal pathogen in fish, particularly in captive aquatic environments.
- Understanding its morphology and growth requirements is crucial for diagnosing and managing infections in fish populations.
- The updated list of susceptible fish species aids in broader ecological and veterinary assessments of Exophiala-related diseases.