Flukes and Sick Guppies (8 pages) tackles the problem of why guppies die for “no good reason.” It starts with the author’s discovery of skin flukes (Gyrodactylus species) on her own guppies. Apparently, these Monogenean parasites have been a major, long-standing pathogen of the guppy (Poecilia reticulata). The author describes treatments and disease management strategies. Photo (magnified) shows Gyrodactylus flukes feeding on the outer mucus layer of a heavily infested salmon.