Abstract
Effects of temperature and level of illumination on cardiac and respiratory rhythms have been analyzed in the juvenile Atlantic salmon Salmo salar L. at different stages of ontogenesis. The study was carried out under field conditions, which allowed avoiding to a considerable degree the effect of artifacts due to chemical and physical properties of water and to fish transposition. The “handlinglp”-reaction of the fry cardiac and respiratory activities was examined. A statistically significant decrease of the respiration rate (RR) by the 30th min and of the heart rate (HR) by the 15th min of experiment was revealed. A more expressed reaction of the decrease of cardiac and respiratory activities after transfer to the working chamber was found in juvenile salmons at early stages of their development. A linear dependence of frequency characteristics of electrocardiograms and electropneumograms (ECG and EPG) was shown in parrs and smolts on temperature in the range from 4 to 24°C. According to reaction of the respiratory system of smolts there was identified a signaling significance of the illumination level in the range of 10–20 kLx, which is confirmed by data on fish behavior in nature. Study of the changes in EEG and EPG allowed suggesting the presence of correlation of frequency characteristics of cardiac and respiratory activities of juvenile salmons with the metabolic level. However, moments of fundamental organism rearrangement in smolts are to be identified, which complicates the use of RR and HR as the measure of the metabolic level at this stage of the Atlantic salmon development.
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Translated from Zhurnal Evolyutsionnoi Biokhimii i Fiziologii, Vol. 41, No. 2, 2005, pp. 139–145.
Original Russian Text Copyright © 2005 by Bakhmet.
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Bakhmet, I.N. Electrophysiological Study of Effects of Environmental Factors on Respiration and Cardiac Activity in the Fry of the Atlantic Salmon Salmo salar . J Evol Biochem Phys 41, 176–184 (2005). https://doi.org/10.1007/s10893-005-0052-0
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DOI: https://doi.org/10.1007/s10893-005-0052-0