赤潮と漁業被害(パネルディスカッション)(第9回環境汚染物質とそのトキシコロジーシンポジウム)

概要

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Red tides appearing in the coast area of Japan cause the mass mortalities of fish and other marine organisms together with the decrease of fish catch for seveal ten days. In 1972 the most severe case occurred in the Harima Nada, the Seto Inland Sea, by the red tides due to Chattonella antiqua (HADA) ONO, when 14 million yellow tail fishes were killed corresponding to the loss of 72 billion yens. The fish kill due to C. antiqua occurred successively in 1977,1978,1979 and 1982 in the Harima Nada and other water areas. The countermeasure against the outbreaks of the red tides is one of the most important marine environmental problems to be established. The present author proposed the mechanism of fish kill by C. antiqua. The potent toxic substances were not found in C. antiqua thus far. The destruction of surface cells of the gills by free fatty acids contained in C. antiqua seems the first step of the fish kill. The following accumulation of lactic acid in the blood caused the decrease of Boar's effect of hemoglobin. Decrease of dissolved oxygen in sea water promotes the fish death in suffocation caused by these situations (Fig. 2). The minimum lethal cell density of C. antiqu was estimated as about 500 cells/ml at 23℃ in 100% saturation of dissolved oxygan.
公益社団法人日本薬学会の論文
1983-02-28