Gyrodactylidae et Gyrodactylose des Salmonidae

The first report of Gyrodactylus salaris Malmberg, 1957 (Platyhelminthes, Monogenea) on Italian cultured stocks of rainbow trout (Oncorhynchus mykiss Walbaum)

“…Molná r and Ghittino (1977) commented on the occurrence of a gyrodactylid ''morphologically like G. salaris'' on cultured rainbow trout and brown trout, but prior to the current study, this report was not confirmed and the figures that were presented in the earlier account do not permit a definitive identification. Gyrodactylus derjavinoides (cited as G. derjavini Mikhailov, 1975), however, is already known from Italy and has been reported from Italian brown and rainbow trout (Malmberg, 1993). Malmberg and Malmberg (1993) suggested that G. salaris originated in the Baltic area; it is known to occur naturally at low intensities in this area including the Russian Onega and Ladoga water systems and within some Swedish and Finnish rivers that drain into the Baltic Sea (Ieshko et al, 1996;Shulman et al, 2000).…”

“…Throughout Europe, G. salaris has also been reported from Norway (Johnsen and Jensen, 1991;Johnsen et al, 1999), from rivers on the Swedish west coast Alenä s, 1998), Denmark (e.g. Buchmann and Bresciani, 1997;Buchmann et al, 2000), Finland (Rimaila-Pä rnä nen and Wiklund, 1987;Kerä nen et al, 1992;Koski Malmberg, 1995;Koski, 1996;Rintamä ki-Kinnunen and Valtonen, 1996), Russia (Ergens, 1983;Ieshko et al, 1996Ieshko et al, , 1997Meinilä et al, 2004), Germany (Lux, 1990;Dzika et al, 2009), Spain (Malmberg, 1993), France (Johnston et al, 1996) and, most recently, from Poland (Rokicka et al, 2007). While the presence of G. salaris has been confirmed by molecular methods for many of these, the reports from certain countries, i.e.…”

Parasitic infections in pond-reared rainbow trout Oncorhynchus mykiss in Denmark

“…The pathogenicity of the Norwegian strain of Gyrodactylis salai-is to Norwegian (Johnsen & Jensen 1988, Bakke et al 1990, Malmberg 1993, MO 1994 and Scottish (Bakke & MacKenzie 1993) salmon stocks is notorious. As the spreading of parasites from rainbow trout farms to feral salmonids is considered possible (MO 1991, Malmberg & Malmberg 1993, attention should be given to the interactions between feral and farmed fish in spreading the parasite.…”

“…As the spreading of parasites from rainbow trout farms to feral salmonids is considered possible (MO 1991, Malmberg & Malmberg 1993, attention should be given to the interactions between feral and farmed fish in spreading the parasite. Thus, the native Danish stocks of Salmo salarwere eradicated years ago due to river regulation and pollution, and future restocking programmes should use salmon resistant to the parasite.…”

“…Thus, the native Danish stocks of Salmo salarwere eradicated years ago due to river regulation and pollution, and future restocking programmes should use salmon resistant to the parasite. Salmon stocks from the Baltic region, which pi-obably is part of the original geographical distribution area of G. salaris (Malmberg & Maln~berg 1993), have an innate relative resistance to infection (Bakke et al 1990, Malmberg & Malmberg 1993.…”