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A bioconcentration study with neo-decanoic acid (CAS #26896 -20 -8) was conducted with the rainbow trout, Oncorhynchus mykiss. The calculated mean bioconcentration factor (BCF) after 14 days of exposure was < 225 L/kg wet fish weight, based on the detection limit for neodecanoic acid. Therefore, based on the BCF data, neodecanoic acid exhibits a low potential to bioaccumulate in aquatic ecosystems. Based on experimental data in fish, neo-decanoic acid is not expected to bioaccumulate in terrestrial species.