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Short-term aquatic toxicity testing on the substance was conducted in fish (Oncorhynchus mykiss). Short-term aquatic toxicity testing in aquatic invertebrates (Daphnia magna) was conducted on tripropenyl succinic acid (CASRN 147384-84-7), by read-across based on a grouping of substances (category approach). An algal growth inhibition assay (Selenastrum capricornutum, now called Pseudokirchneriella subcapitata) and an activated sludge respiration inhibition assay were conducted on the substance. The 48-h EC50 in daphnids and the 96-h LC50 (loading rate) in fish were each reported at > 100 mg/L; the ErC50 in algae was reported at a loading rate of 110 mg/L. Long-term testing in fish and invertebrates was not conducted; the substance is not poorly soluble in water, and is rapidly hydrolysed in water at environmentally relevant temperature and pH conditions; the results of the chemical safety assessment showed that the risk characterization ratios for surface water are all below one. Therefore, long-term aquatic toxicity testing was not indicated.