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Laser Doppler monitoring of alterations of blood-flow parameters in fish embryos in response to light irradiation: study of long-term and short-term reactions

In this paper new experimental results on monitoring of alterations of blood flow parameters in growing fish embryos under laser and non-laser light irradiation are discussed. The measurements were performed by means of laser Doppler technique with high temporal and spatial resolution. Two parameters of blood flows were mostly measured: average velocity and frequency of velocity pulsations. These parameters were shown to be an adequate characteristics of nonstationary blood flows in fishes. The problem of noninvasivity of such experiments is discussed. For this purpose absorption spectra of fish embryos were measured. The quantitative response of blood flows to irradiation at different light wavelengths was recorded. Different species of fishes were used to compare the responses. Different effects were recorded which depend upon the doze and the wavelength of irradiation, and upon the stage of the embryo development at which the irradiation had taken place. Among those effects long-term and short-term reactions can be distinguished.