I. V. Nechaeva, D. S. Pavlova, and V. Ya. Nikandrovb
a Institute of Ecology and Evolution, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia
e-mail: inechaev@sevin.ru
b Federal Selection-Genetic Center of Fish Culture (FSGCF), Ropsha, Leningrad oblast, Russia
Received November 13, 2006
Abstract—Dynamics of the level of monoamines and their metabolites in the brain of juveniles of the Atlantic
salmon Salmo salar is investigated in the initial period of differentiation of the progeny into parrs and smolts.
The first differences in the level of metabolism of noradrenaline (NA) and 5-HT arise in the optical tectum of
the brain before the beginning of smolting. Appearance of the first signs of smolting in juveniles is accompanied
by the increase of differences in the level of activity of HA- and 5-HT-ergic systems in the forebrain and hypo-
thalamus. The first differences in the activity of the DAergic system between parrs and smolts were observed
in the period of visible differences in fish coloration. In the same period, considerable differences in the level
of adrenaline and noradrenaline in the fish blood were recorded. In experiments on a prolonged exposure of fish
to a current of different intensity, it was shown that behavior and physiological response of the fish organism
are different: in parrs, the stressogenous response is developed, they stop feeding, weight loss takes place, and
they cannot withstand the water flow; smolts adapt to the current using heterogeneity of water movements.
DOI: 10.1134/S0032945207090093
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