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Abstract:
Exophiala pisciphila is a dematiaceous fungus that belongs to a group of fungi known as the 'black yeasts'. It was isolated from the skin lesions of a smooth dogfish, Mustelus canis Mitchill, that had been born in the shark exhibit tank of the New York Aquarium. The different stages of development of this fungus were studied by light microscopy and scanning electron microscopy to illustrate the morphology and surface structures of conidia and mycelium. The list of marine and fresh water fish, which have been infected by Exophiala spp. and Exophiala-like fungi has been up-dated. Potato Dextrose Agar and Malt Agar proved to be the best growth media, while Corn Meal Agar proved to be the best medium for studying the morphological features of the conidia and mycelial development of E. pisciphila, which exhibited polymorphic conidiogenesis.
Insights
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.