Interactions between two congeneric gyrodactylids (Gyrodactylus derjavini and G. salaris) with different microhabitats on their common host rainbow trout, Oncorhynchus mykiss
2007
Garbol, L.W. | Jorgensen, T.R. | Buchmann, K.,University of Copenhagen, Frederiksberg (Denmark). Dept of Veterinary Pathobiology
Fry of rainbow trout, Oncorhynchus mykiss, infected either with a total of 459 G. derjavini (12 fish) or a total of 405 G. salaris (12 fish) (approximately 35 parasites per fish) were maintained with a total of 12 uninfected fish for two weeks. The infection dynamics and dispersal of parasites among the three groups were recorded during the period. Within the two-week study period, parasites spread from infected- to naive rainbow trout, which obtained a parasite burden (293 parasites in 10 hosts) corresponding to the level of previously infected fish. Gyrodactylus derjavini demonstrated a higher colonisation ability. This species continued to exhibit predilection for both fins and body skin as microhabitats. In contrast, G. salaris was less mobile and less prone to colonise new hosts, especially infected ones. The results suggest the existence of specific microhabitats on the body and fins of rainbow trout, which are occupied by specific parasites
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