Gyrodactylus salaris, commonly known as salmon fluke, [1] salmon killer, or the Norwegian salmon killer is a tiny monogenean ectoparasite which lives on the body surface of freshwater fish. [2] This leech-like parasite has been implicated in the reduction of Atlantic salmon populations in the Norwegian fjords . [ 3 ]

Gyrodactylus arcuatus Bychowsky, 1933; Gyrodactylus atherinae Bychowsky, 1933; Gyrodactylus australis Gusev, 1966; Gyrodactylus avalonia Hanek & Threlfall, 1969; Gyrodactylus blennii Gaevskaya & Dmitrieva, 1997; Gyrodactylus branchialis Huyse, Malmberg & Volckaert, 2004 [3] Gyrodactylus branchicus Malmberg, 1964; Gyrodactylus bubyri Osmanov, 1965

Gyrodactylus. has many that parasitize both marine and freshwa-ter fish. In Alaska, the worm is common-ly observed as an external parasite of wild and hatchery salmonids. The genus . Dactylogyrus. is found worldwide para-sitizing mostly cyprinids in freshwater. III. Clinical Signs . The skin of fish infested with . Gyro-may become mottled, necrotic

Gyrodactylus salaris (Platyhelminthes; Monogenea) is a viviparous freshwater parasite of Atlantic salmon (Salmo salar) that causes gyrodactylosis. 2. Disease information 2.1. Agent factors 2.1.1. Aetiological agent, agent strains Several strains or clades of Gyrodactylus salaris have been identified on the basis of genotyping with the

Gyrodactylus are small, leech-like parasites. Over 400 species have been described, from fish and frogs, in fresh and salt water. In Norway, catastrophic losses of Atlantic salmon were seen following the introduction of G. salaris to the country in the 1970s.

Gyrodactylus are a group of monogenean (i.e. 1-host) trematode parasites of fish, most often found on skin, occasionally gills. They are similar to Dactylogyrus, except their anterior (head) end does not have eyespots, but does have prominent hooks for anchoring to the skin.

One of the major threats to stocks of Atlantic salmon in the freshwater phase is the parasite Gyrodactylus salaris. It is a small parasite (0.5mm in length) infecting the skin, gills and fins of fish and is capable of rapid multiplication.