Cryptococcus-like structures in fish
Not everything with a capsule is Cryptococcus. Morphology may resemble it, but conclusions require caution.
Fungi
Fungal structures in fish: colonization or invasive process
Hyphae in fish are not always saprolegniosis. It is important to distinguish colonization from invasive processes.
Granulomas and intracellular agents in fish
Intracellular microorganisms in fish: morphology, localization, and diagnostic interpretation.