Gyrodactylus are monogenetic trematodes that have a direct life cycle requiring no intermediate host. The genus Gyrodactylus comprises 409 recognized species. Approximately 60% of these are fish host-specific, while others can infect multiple fish species (Bakke et al. 2007). One species of particular interest to salmonid culturists in the United States is Gyrodactylus salmonis, which attaches to and deeply penetrates the epidermis of its host.
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