The mouse bioassay for diarrhetic shellfish poisoning toxins has been used worldwide. In this study, dinophysistoxin-1 (DTX-1) and okadaic acid (OA) were compared for toxicity. The lethality rate increased and the median survival time decreased in a dose-dependent manner in both DTX-1 and OA. The median lethal dose value was 150.4 µg/kg (95% confidence interval=130.1-171.2 µg/kg) for DTX-1 and 185.6 µg/kg (95% confidence interval=161.2-209.6 µg/kg) for OA. The toxicity equivalent factor 1:1 has been used for OA and DTX-1 in the EU and Japan. Thus, it may be considered that toxicity potential of DTX-1 has remained underestimated as compared to that of OA and DTX-1 might be more toxic than OA.
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