Level of natremia as an index of the condition of the organism of animals under stress

In the diagnosis of stressful conditions in humans and other animals, ionic indicators remain practically unused. this work, we studied changes concentrations sodium ions blood plasma freshwater fish under stress caused by stressors different quality quantity. Most experiments were carried out on adult bream (Abramis brama L) from Rybinsk Reservoir. Separate duplicated individuals roach (Rutilus rutilus L.), pike (Esox lucius blue ballerus L.). The concentration cations was determined using a Flapho-4 flame photometer. Under action mild short-term qualities, internal environment altered toward an increase gradients cell membrane (eustress or physiological stress). Hypernatremia approximately 10%. strong and/or prolonged strength, changed decrease (distress pathological Hyponatremia 50% acute lethal stress, 20% subacute 10% more chronic stress. During reversible hyponatremia could reach 30%. Analysis material mammals allowed us to conclude that adaptation mechanisms higher vertebrates are similar. for first time, state system electrolyte balance animals analyzed standpoint leading role (mainly sodium) energetics (level disequilibrium) organism. We propose concept normal extreme use two defense reactions (or strategies): active passive, consisting, respectively, increasing decreasing level disequilibrium (energy) recorded numerous authors, which accompanies diseases humans, is evidently nonspecific reaction organism serves as indicator reduced energy It suggested be used diagnosing animals.