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The toxic effects of ochratoxin-A (OTA) on sea bass,
Dicentrarchus labrax L., have not been previously documented. A flow-through bioassay test system was conducted in two series and a total 180 of adult marine-reared sea bass was used to estimate the acute oral 96
h median lethal concentration (LC
50) value and behavioral changes of OTA. The data obtained were statistically evaluated using Finney’s Probit Analysis Method developed by EPA. The 96
h LC
50 value for adult
D. labrax was found to be 277
μg
kg
−1
bwt with 95% confidence limits of 244–311
μg
kg
−1
bwt. This value was calculated to be 285
μg
kg
−1 bwt with Behrens–Karber’s method. The two methods were relatively comparable. The acute dietary 96
h LC
50 of OTA is 9.23
mg
kg
−1 diet. Additionally, the behavioral changes of sea bass were primarily observed as nervous and respiratory manifestations. We concluded that sea bass is a species highly sensitive to OTA making them a useful experimental model for aquatic mycotoxigenic problems.