In 1972, " Gyrodactylus ", a monogenean parasite, was introduced with live trout and salmon from Sweden ( Baltic stocks are resistant to it ) into government operated hatcheries in Norway.
12.
Also, the parasite " Gyrodactylus stableri " infests the fins and organisms of " Neascus ", a genus of flukes, infest the eye and internal tissues of the fish.
13.
Numedalsl�gen is known for being a good location for salmon fishing, although a parasite known as " Gyrodactylus salaris " has recently been found in Numedalsl�gen that may pose a threat to its salmon stock.
14.
""'Gyrodactylus salaris " "'is a small monogenean ectoparasite ( about 0.5 mm long ) which mainly lives on the skin of freshwater fish, especially Atlantic salmon.
15.
""'Gyrodactylus leptorhynchi " "'is a small monogenean ( about 0.5 mm long ) obligate Bay Pipefish and the first characterized along the Pacific coast of North America.
16.
A number of parasites have been observed on this species, including " Myxosoma funduli ", a fluke, and " Gyrodactylus bulbacanthus ", a monogenean, all of which infest the gills.
17.
Ranelva was cleansed with rotenone in 1996, 2004, and 2005 beneath the " Sj�forsen " waterfall, in order to remove the salmon parasite Gyrodactylus salaris, which was registered there for the first time in 1975.
18.
In an experiment studying three-spined sticklebacks, researchers found that females prefer to mate with males that share a greater diversity of major histocompatibility complex ( MHC ) and in addition possess a MHC halotype specific to fighting the common parasite " Gyrodactylus salaris ".
