Growth of Porphyra yezoensis f. narawaensis on Culture Nets in the Nori Farm and Its Environmental Conditions.

概要

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The young thalli of Porphyra yezoensis f. narawaensis is used widely in the industrialized noni culture in Japan, indicates high growth rate were much investigated in noni culture farm of Saga Prefecture facing Ariake Bay. In this study, the growth patterns were observed in detail in each cultural period of 1983 to 1985. The juvenile thalli better grew in the year of lower water temper-atures and higher salinities. Furthermore it became clear that the low salinity conditions before an exposure arrest the growth of the thalli under the nursing culture. This tendency was seen more evidently in the younger and smaller thalli. Under the field culture, their growth often stagnated owing to remarkably changes of the environment of two or three days ago before. The growth pat-tern of the caltural juveniles formed a logistic curve, whose formula derived from the average of three years was expressed by follows; Lt=242.662/ (1+exp. (-0.261 (t-31.576) ) ) Lt: thallus length (mm) after t days, t: days.
日本水産増殖学会の論文