Assessment of the biological activity of water on growth and blood counts of comets (Carassius gibelio forma Auratus (Bloch, 1782))

The article presents the results of the study of comet response to water that had undergone special preparation. During the study (60 days), most of the hydrochemical parameters corresponded to the normal values of fish rearing. During the experiment, the comets of the control and experimental groups were fed the same amount of food - 60 g each. Throughout the entire period of research, the fish of both groups had a good appetite; the eatability of granules was high. During the observations, the mass of comets in the control group decreased by 8.1% and amounted to 163.8±15.6 g, in the experimental group this indicator decreased by 8.5% and reached 164.0± 9.2 g by the end of the experiment that is associated with the change-over of comets to a normalized feed intake. The biochemical parameters of the blood serum of the fish of the experimental and control groups did not have significant differences. All this indicates the absence of a negative impact of the quality parameters of water that had undergone special preparation on the interior values of comet blood. Nevertheless, clinical and morphological blood parameters of the studied fish (lymphopenia, neutrophilia, an increase in blast variants) indicate their stress state, possibly associated with handling stress and blood sampling, but some indicators (an increase in hemoglobin, erythrocytes, the number of mature neutrophils) may indicate a state of intoxication and oxygen deficiency, more pronounced in the fish of the experimental group.