Isolation of infectious microalga Prototheca wickerhamii from a carp ( Cyprinus carpio ) – a first confirmed case report of protothecosis in a fish

Protothecosis is a rare infection caused by environmentally ubiquitous achlorophyllic microalgae of the genus Prototheca . Here, we describe a first case of protothecosis in a carp ( Cyprinus carpio ), which is at the same time the first case of protothecosis in a fish, confirmed by phenotype‐ and molecular‐based methods, including PCR sequencing of the rDNA cluster and protein profiling using matrix‐assisted laser desorption ionization time‐of‐flight mass spectrometry.