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The amounts of puffer toxin (tetrodotoxin, TTX) extracted from the fresh and the traditional Japanese salted and fermented "Nukazuke" and "Kasuzuke" ovaries of Takifugu stictonotus (T. stictonotus) were quantitatively analyzed in the voltage-dependent sodium current (I(Na)) recorded from mechanically dissociated single rat hippocampal CA1 neurons. The amount of TTX contained in "Nukazuke" and "Kasuzuke" ovaries decreased to 1/50-1/90 times of that of fresh ovary during a salted and successive fermented period over a few years. The final toxin concentration after fermentation was almost close to the TTX level extracted from T. Rubripes" fresh muscle that is normally eaten. It was concluded that the fermented "Nukazuke" and "Kasuzuke" ovaries of puffer fish  T. Stictonotus are safe and harmless as food.

Removal of Toxin (Tetrodotoxin) from Puffer Ovary by Traditional Fermentation