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Toxicity of pufferfish Takifugu rubripes cultured in netcages at sea or aquaria on land.
Marine pufferfish (family Tetraodontidae) are believed to accumulate tetrodotoxin (TTX) mainly in liver and ovary through the food chain by ingesting TTX-bearing organisms such as starfish, gastropods, crustacean, flatworms, ribbonworms, etc. Consequently, it is hypothesized that non-toxic pufferfish can be produced if they are cultured with TTX-free diets in netcages at sea or aquaria on land, where the invasion of TTX-bearing organisms is completely shut off. To confirm this hypothesis, more than 5000 specimens of the pufferfish ("torafugu", Takifugu rubripes) cultured in such manners for 1-3 years were collected from several locations in Japan during 2001-2004, and toxicity of their livers and some other parts was examined according to the Japanese official mouse assay method for TTX. In addition, typical specimens were submitted to LC/MS analysis. The results showed that all the livers and other parts tested were 'non-toxic' in both of the mouse assay (less than 2 MU/g) and LC/MS analysis (less than 0.1 MU/g). Thus, it is undoubtedly confirmed that pufferfish are intoxicated through the food chain, and non-toxic pufferfish can be successfully produced by netcage or land culture. The livers from these fish can be used with safety as a Japanese traditional food "fugu-kimo" (puffer liver).
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