CALCULATION METHOD AND CALCULATION DEVICE OF PRESENT AMOUNT OF SPECIFIC KIND OF PHYTOPLANKTON, AND SIGN DETECTION METHOD AND SIGN DETECTION DEVICE OF OCCURRENCE OF RED TIDE BY SPECIFIC KIND OF PHYTOPLANKTON

摘要

To easily calculate a present amount of a specific kind of phytoplankton out of a phytoplankton group in which a plurality of kinds of phytoplanktons are present.SOLUTION: The invention is configured to radiate excitation light to a phytoplankton group including a plurality of kinds of phytoplanktons. There may be included a specific kind of a phytoplankton in the plurality of kinds of phytoplanktons. The specific kind of the phytoplankton comprises chlorophyll an absorbing the excitation light and generating fluorescence, and absorbing the fluorescence again. In the invention, intensities I670, I690 of the fluorescence are measured in a plurality of wavelength bands A, B in which ease of occurrence of re-absorption is different each other, and based on the intensities I670, I690 of the fluorescence measured in the plurality of wavelength bands A, B, a present amount K of the specific kind of a phytoplankton is calculated.SELECTED DRAWING: Figure 1