TTX accumulation in pufferfish |
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Authors: | Tamao Noguchi Osamu Arakawa Tomohiro Takatani |
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Institution: | aJapan Frozen Foods Inspection Corporation, Shibadaimon 2-4-6, Minato, Tokyo 105-0012, Japan;bFaculty of Fisheries, Nagasaki University, Bunkyo-machi 1-14, Nagasaki 852-8521, Japan |
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Abstract: | Tetrodotoxin (TTX) has been detected in a variety of animals. The finding of TTX in the trumpet shell Charonia sauliae strongly suggested that its origin was its food, a TTX-bearing starfish Astropecten polyacanthus. Since then, the food chain has been consistently implicated as the principal means of TTX intoxication. To identify the primary producer of TTX, intestinal bacteria isolated from several TTX-bearers were investigated for their TTX production. The results demonstrated that some of them could produce TTX. Thus the primary TTX producers in the sea are concluded to be marine bacteria. Subsequently, detritus feeders and zooplankton can be intoxicated with TTX through the food chain, or in conjunction with parasitism or symbiosis. The process followed by small carnivores, omnivores or scavengers, and by organisms higher up the food chain would result in the accumulation of higher concentrations of TTX. Finally, pufferfish at the top of the food chain are intoxicated with TTX. This hypothesis is supported by the fact that net cage and land cultures produce non-toxic pufferfish that can be made toxic by feeding with a TTX-containing diet. |
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Keywords: | Pufferfish Tetrodotoxin (TTX) Intestinal bacteria Food chain Parasitism Symbiosis Resistibility against TTX |
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