Gill worm Ancyrocephalus percae (Ergens 1966) outbreak negatively impacts the Eurasian perch Perca fluviatilis L. stock of Lake Constance, Germany.

The article discusses the outbreak of gill worm (Ancyrocephalus percae) affecting Eurasian perch (Perca fluviatilis L.) in Lake Constance in Germany. It says that 539 perch from three age classes were sampled in Upper Lake Contance and a necropsy of the gills and isthmus for Ancyrocephalus was performed. It states that the isthmus of perch was found to be almost exclusively infected by A. percae.