scholarly journals Do rainbow trout and Atlantic salmon discriminate kin?

1992 ◽  
Vol 70 (8) ◽  
pp. 1636-1640 ◽  
Author(s):  
Grant E. Brown ◽  
Joseph A. Brown
Keyword(s):  
Rainbow Trout ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Coho Salmon ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Salmonid Fishes ◽  
Kin Discrimination ◽  
Significant Preference ◽  
Rainbow Trout Oncorhynchus Mykiss

The purpose of this study was to determine if juvenile Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) can discriminate kin from non-kin, since other salmonid species (coho salmon (Oncorhynchus kisutch) and Arctic charr (Salvelinus alpinus)) have been shown to possess this ability. When tested in water conditioned by conspecifics (kin and non-kin) and heterospecifics in a two-choice tank, both rainbow trout and Atlantic salmon demonstrated a significant preference for kin over non-kin and heterospecifics, indicating that these species possess kin-discrimination abilities. This ability appears to be widespread among salmonid fishes.

Variation in host preference within Gyrodactylus salaris (Monogenea): an experimental approach

Parasitology ◽  
2006 ◽  
Vol 134 (4) ◽  
pp. 589-597 ◽  
Author(s):  
K. OLSTAD ◽  
G. ROBERTSEN ◽  
L. BACHMANN ◽  
T. A. BAKKE
Keyword(s):  
Rainbow Trout ◽  
Atlantic Salmon ◽  
Oncorhynchus Mykiss ◽  
Salmo Salar ◽  
Host Preference ◽  
Experimental Approach ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Reproductive Capacity ◽  
Southern Norway

The monogenean ectoparasite, Gyrodactylus salaris Malmberg, 1957, has had a devastating effect on wild Atlantic salmon (Salmo salar) since its introduction to Norway in the mid-1970s. In Lake Pålsbufjorden, southern Norway, upstream of the stretches of the River Numedalslågen with anadromous Atlantic salmon, a resident Arctic charr (Salvelinus alpinus) population has been reported to be infected with G. salaris which is viable in the absence of its normal host, the Atlantic salmon. Currently, there is no record of G. salaris infecting Atlantic salmon in the downstream sections of the River Numedalslågen. We studied experimentally the infectivity and reproductive capacity of G. salaris from Lake Pålsbufjorden on wild and hatchery-reared Atlantic salmon as well as on Arctic charr and rainbow trout (Oncorhynchus mykiss). Arctic charr and rainbow trout were moderately susceptible, whereas the Atlantic salmon stocks from River Numedalslågen and River Drammenselva were innately resistant to only slightly susceptible. Thus, the G. salaris from Arctic charr in Lake Pålsbufjorden is considered non-pathogenic to Atlantic salmon. This is the first observation of variation in host preference among Norwegian G. salaris populations. The observed differences in virulence between G. salaris populations could have important consequences for the international legislation and management of Atlantic salmon.

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