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Low levels of saxitoxins and tetrodotoxin were found in the viscera of adult chum salmon Oncorhynchus keta returning to spawn. The nucleic magnetic resonance and mass spectrum analyses as well as several kinds of chromatographies clearly showed that the purified toxins were saxitoxin and neosaxitoxin. Tetrodotoxin, which was detected by high performance l~qu id chromatography analysis, could not be isolated. These findings show that saxitoxlns and tetrodotoxin are more widely distributed in aquatlc organisms than previously thought.

Trace amounts of saxitoxins in the viscera of chum salmon Oncorhynchus keta