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Studies on the aquatic toxicity of stearic acid (CAS 57-11-4) are available for all three trophic levels (fish, invertebrates and algae). Additionally read-across is applied to palmitic acid (CAS 57-10-3).

All studies resulted in no toxicity up to the limit of water solubility of the test substance. A study on the chronic toxicity of stearic acid to fish is not available. However, since all other short-term and chronic toxicity tests yielded no evidence of toxic effects of stearic and palmatic acid to aquatic organisms, chronic toxicity to fish is not expected and the endpoint is waived.