Abstract
The article deals with studies of serotonergic system activity in different tissues of semimigratory fish—the Caspian roach (Rutilus rutilus caspicus) and the carpbream (Abramis brama orientalis)—and of migratory fish—shemaya (Chalcalburnus chalcoides) caught in fresh and brackish waters, as well as in the common carp (Cyprinus carpio L.) tissues under effect of brackish water in model experiments. Using the indirect solid-phase ELISA-test, the serotonergic system activity was evaluated by measuring in the tissues of the studied fish the serotonin-modulated anticonsolidation protein (SMAP) which is in linear relationship with the serotonin level. There was found a significant elevation of SMAP levels in brains of the Caspian roach, carpbream, shemaya, and the common carp under action of increased water salinity. A revealed increase of the SMAP content in brain of the Caspian roach, carpbream, shemaya and the common carp under action of increased water salinity reflects the corresponding elevated activity of the serotoninergic system and indicates involvement of adaptive readjustments in the animals’ body.
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