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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

35 day NOEC 0.16 mg/L (Pimephales promelas)

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater fish:
0.16 mg/L

Additional information

The key study is a flow-through long-term toxicity test conducted with fathead minnows (Pimephales promelas) according to U.S. EPA methodologies. Exposure began during the embryo stage and lasted for 35 days. Fish were exposed to 0.024, 0.04, 0.084, 0.16, and 0.31 mg/L TBBPA (mean measured concentrations), with water samples for chemical analysis collected on test days 0, 4, 11, 16, 18, 25, 29, 32, and 35. The 35-day NOEC was determined to be 0.16 mg/L TBBPA, as there was a significant reduction in growth observed in fish exposed at this level. Larval fish survival was significantly reduced at the highest test concentration.

Supporting data is provided in the form of a partial life-cycle test with zebrafish (Danio rerio). Exposure of adult fish to the test material for 30 days at nominal concentrations of 0 (control), 0.023, 0.047, 0.094, 0.188, 0.375, 0.750, 1.50, 3.00, and 6.00 µM under semi-static conditions was followed by exposure of the offspring in early life stages up to 47 days post hatching to the same concentrations.

The study indicates that exposure of zebrafish to the test material can result in effects on population-relevant parameters such as egg production, juvenile survival, and gender development of offspring at test material-body burdens around 5 - 7 µg/g lipid. Although the results could be consistent with the oestrogenic activity of the test material, the extent to which such a mechanism plays a role remains unclear without further supportive evidence. There were no indications for anti-thyroid activity

Under the conditions of this study, the results indicate decreased reproductive success in zebrafish at environmentally relevant test material concentrations.