アサクサノリPorphyra tenera Kjellm.糸状体の生態-3-

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Many living Conchocelis which have penetrated into various shells are found in the shallow water near the culture ground of P. tenera in Tokyo bay during the period March to June, but most of them dry up out of water and die out in the summertime. So we studied on resistibility of the Conchocelis cultured in the laboratory against unfavorable conditions such as desiccation, direct sunlight, high temperature and embedding in sand. The results are as follows. 1) The resistibility of the Conchocelis kept in the air varies with the humidity of the air (Table 1). In humidity of about 70% they die after 30 minutes, and they can survive more than 90 minutes in air with a higher humidity. 2) When the Conchocelis are exposed to direct sunlight in air, they die after 6 minutes, but in the shade they survive for more than 60 minutes (Table 2). 3) The effect of direct sunlight in the water seems to be modified according to the depth at which the Conchocelis are laid (Table 3). They die in from one to two hours at a depth of 2cm., but survive for 2-2.5 hours at 5cm. or 10cm. depth. 4) At a temperature of 36°C., the Conchocelis can live for about 8 hours, but at 40°C. they die within one flour (Table 4). 5) The resistibility of the Conchocelis against covering with sand varies with the thickness of sand deposited. They can survive for 30 days in running water when covered by 5cm, of sand, but in stagnant water all die in less than 9 days (Table 5).
社団法人日本水産学会の論文

アサクサノリPorphyra tenera Kjellm.糸状体の生態-3-

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