Abstract
Experimental investigation on rheoreaction as a behavioral mechanism in the formation of phenotypic groups of underyearlings of the Atlantic salmon Salmo salar is performed. Juveniles of the Atlantic salmon are investigated at the age 0+ from the coastal group and from the tributary group in the period of its primary distribution from redds. The underyearlings from the tributary group differ from the coastal fish in increased critical current velocity, the fact that among them the most portion of individuals have a positive type of rheoreacrtion, and the fact that they prefer currents more often. The behavioral mechanism of spatial separation of the spreading juveniles at confluence of two currents is revealed: stronger individuals with the positive type of rheoreaction and the expressed rheopreferendum mainly move against the flow at a higher speed and manage to get into a tributary. The weaker fish with static and negative dynamic types of rheoreaction, having no expressed rheopreferendum, prefer the flow with lower current rate and turn out to be in the coastal zone of the mainstream.
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Original Russian Text © D.S. Pavlov, V.Yu. Ponomareva, A.E. Veselov, V.V. Kostin, 2010, published in Voprosy Ikhtiologii, 2010, Vol. 50, No. 4, pp. 548–553.
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Pavlov, D.S., Ponomareva, V.Y., Veselov, A.E. et al. Rheoreaction as a mechanism of formation of phenotypic groups of underyearlings of the Atlantic salmon Salmo salar . J. Ichthyol. 50, 483–488 (2010). https://doi.org/10.1134/S003294521006007X
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DOI: https://doi.org/10.1134/S003294521006007X