Abstract
Screening tests were carried out on the toxicity of freshwater puffers Tetraodon leiurus complex and Tetraodon suvatii collected from Udonthani province, north-eastern Thailand. Toxicity was highest in the liver and varied according to the location and season of fish catch. Fish which were reared in tap water for 3 months reduced the toxicity substantially. Partial purification was achieved by an ultrafiltration technique. Toxin components were consequently identified by high-performance liquid chromatography. It was found that toxins separated from the eggs, liver, skin and muscle of these puffers were composed of saxitoxin, neosaxitoxin and decarbamoylsaxitoxin
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