Abstract

Long-term consequences of simulated geomagnetic storm action on early stages (0–24 h, 24–48 h, 48–72 h and 72–96 h post fertilization) of roach Rutilus rutilus embryogenesis were studied. The study revealed that fluctuations of magnetic field resulted in the decrease in the fish body length and weight, as well as in the differently directed changes in the activities of glycosidases (maltase, sucrase, and amylolytic activity) and kinetic characteristics of carbohydrates hydrolysis in the intestine of 4 month-old roach. The most pronounced changes in the fish body sizes were noted after exposure to magnetic field fluctuations within the time period of 48–72 h post fertilization. Relatively low values of Michaelis constant were revealed in the fish developed during embryonic stage either in the hypomagnetic conditions or under impact of simulated geomagnetic storm. This phenomenon may be considered as a response of fish digestive system to changes in the magnetic field during embryogenesis.

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