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No data are available for Trichloroisobutylsilane. Reliable acute aquatic toxicity tests results for freshwater fish (Brachydanio rerio), invertebrates (Daphnia magna) and algae (Scenedesmus subspicatus) are however available from a read-across substance (Trimethoxy(2-methylpropyl)silane (CAS 18395-30-7)) that shares the same hydrolysis products. LC50 or EC50 values for the three organisms were >100, >864 and >1170 mg/L respectively. A NOEC of 221 mg/L was determined in the algal test.