Impact of transportation and environmental change on the levels of glucocorticoids, electrolytes and osmolarity of the blood of carp (Cyprinus carpio L.)

The present studies revealed that the transportation and the associated change of environmei;it, causing statistically signifi cant cortisol level rise, led to the increase of sodiumand chloride-ion levels and ostnofarity, as well as to the fall of po tassium-ion concentration in the· blood of carp. Despite the persistence. of the high level of cortisol in the bloo4. of carp, throughout the whole 7-day-long monitored perio'd, the levels of Na+, er, and the blood osmolarity came back to .normal. The exception were potassium ions, whose concentration on the 7th day after the transfer were still statistically lower than the ini tial values.