PURPOSE:To enable evaluation of large sea weeds accurately and simply in a short time, by collating measured intensity value of fluorescence from a sample piece with the fluorescent intensity-quality inspection curve preset. CONSTITUTION:Among pigments of sea weeds such as chlorophyl (A), (b) or (c), phycoerythrin, phycocyanine, carotenoid and the like, the most effective one for the sea weed involved viewed from the intensity of fluorescence and the correlation between this and the quality is selected as measuring pigment. The intensity of fluorescence is higher in terms of pigment activity for the higher quality of sea weeds, rising in proportion to the quality almost linearly. Thus, in this invention, a fluorescence intensity-quality curve is determined to set a calibration curve and the evaluation of quality is done based on the curve.
