Abstract

Research of the cardiac activity parameters of the crayfish Astacus astacus (L.) during the early ontogenesis (from juvenile till summerling stages) by the new non-invasive method of laser photocardiogramme registration markedly shows the dependence between the heart rate and the size and weight of the different aged crayfish. Measuring the cardiogrammes of the juvenile crayfish of the same age has revealed that there are statistically significant distinctions of the range of heart rate alterations of the crayfish when in air and in water. The range of heart rate alterations of the large juvenile crayfish is greater than that of the smaller ones of the same age. Most crayfish deaths occur during the early stages of ontogenesis. In the artificial conditions the small crayfish die more often. Analysis of the physiological data shows that the adaptive abilities of the large juvenile crayfish in comparison with the small juvenile crayfish are more developed. During the early ontogenesis of the crayfish cardiovascular system the inotrope parameters of the heart activity regulation systems maturate firstly, and then secondly the chronotrope parameters develop. This is supported by the analysis of the alterations of the crayfish inotrope and chronotrope parameters on the laser photocardiogrammes. This data, characterizing the crayfish functional state, allows us to assess their adaptive abilities, which are important properties for breeding crayfish in aquaculture.

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