藻類の発癌に関する研究-1-大牟田川の廃水および懸濁質の発癌性

概要

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It was reported that a certain cancerous disease of Porphyra tenera was observed in the costal waters of Toko, Nagoya and Fukuyama. This disease was also heavily detected in the waters along the industrial city of Ohmuta. The outbreak of this algal cancer seemed to be always limited in the receiving waters of industrial waste water. From the viewpoint of the diversity of the carcinogenic compounds, and the variety of the pollutants in the waste, there should no doubt be a regional peculiarity in the causal substances of this disease in each of the coastal waters mentioned. In this study, carcinogenic potencies were tested with the waste water taken during the ebb tide of the river Ohmuta, and also with mud deposited on the sea bottom, which was about 1.5km north from the mouth of this river. The tests revealed that the waste water showed poor carcinogenic effect when diluted to a concentration as low as that found in the areas under cultivation where this disease can be easily detected, but the mud induced clearly cancers on the leaves of this alga during a 36 day culture after a single contact for periods ranging from 80 to 320 minutes. Therefore, it is concluded that the cancerous disease of Porphyra tenera should be attributable to suspended solids contained in the sea bottom mud which probably is derived from the Ohmuta river as evidenced from the distribution of nitrogeneous aromatic compounds in the bottom mud.
日本水産學會の論文