Influence of hypomagnetic conditions on the activities of glycosidases and kinetic characteristics of carbohydrate hydrolysis in juvenile roach, <Emphasis Type="Italic">Rutilus rutilus</Emphasis>

The study on remote consequences of hypomagnetic conditions during roach Rutilus rutilus embryogenesis (at the stages of embryo and prelarva) revealed multidirectional changes in body length/weight, activities of glycosidases (maltase, sucrase, and amylolytic activity), and kinetic characteristics of carbohydrates hydrolysis in the intestine of the yearlings. The exposure of embryos to hypomagnetic conditions leads to the increase in body length and weight in the yearlings; the exposure of prelarvae leads to the decrease in these parameters. The impact of hypomagnetic conditions at the stage of prelarva results in most pronounced changes in the physiological and biochemical parameters in the yearlings. Decline in the Michaelis constant values, reflecting affinity of an enzyme to substrate, may be considered as an adaptive response of the fish digestive system to the lack of magnetic field during embryogenesis.