Table 3.3 Summary of aquatic toxicity tests with  Triclosan Taxonomy End point Parameter Exposure time¹ Result² µg/L Reference³ Algae Scenedesmus subspicatus E_rC₅₀ Growth⁴ 72 h 2.8 m Reiss, Orvos Scenedesmus subspicatus NOEC Growth⁴ 72 h 0.5 m Reiss, Orvos, NIVA Scenedesmus subspicatus E_bC₅₀ Biomass⁴ 72 h 0.7 m Reiss, Orvos, NIVA Scenedesmus subspicatus EC₅₀ Growth⁵ 96 h 1.4 m Reiss, Orvos Scenedesmus subspicatus NOEC Growth⁵ 96 h 0.69 m Reiss, Orvos Selenastrum capricornutum EC₅₀ Growth 96 h 4.46 n Reiss, Orvos Selenastrum capricornutum EC₂₅ Growth 96 h 2.44 n Reiss, Orvos Skeletonema costatum EC₅₀ Growth 96 h >66 n Reiss, Orvos Skeletonema costatum EC₂₅ Growth 96 h >66 n Reiss, Orvos Navicula peliculosa EC₅₀ Growth 96 h 19.1 n Reiss, Orvos Navicula peliculosa EC₂₅ Growth 96 h 10.7 n Reiss, Orvos Anabaena flos-aquae EC₅₀ Growth 96 h 0.97 n Reiss, Orvos Anabaena flos-aquae EC₂₅ Growth 96 h 0.67 n Reiss, Orvos Crustaceans Daphnia magna EC₅₀ Immobility 48 h 390 m Orvos Ceriodaphnia dubia EC₅₀ Immobility 48 h 130 (?) NIVA Daphnia magna NOEC Reproduction 21 d 40 m Orvos Daphnia magna LOEC Reproduction 21 d 200 m Orvos Ceriodaphnia dubia NOEC Reproduction, pH=7 7 d 6 m Orvos, NIVA Ceriodaphnia dubia NOEC Reproduction, pH=8.5 7 d 182 m Orvos Fish Lepomis macrochirus LC₅₀ Mortality (1969) 96 h 370 n Orvos Pimephales promelas LC₅₀ Mortality 96 h 260 n Orvos, NIVA Oncorhynchus mykiss NOEC Growth and development (ELS) 61 d 34.1 m Orvos, NIVA Oncorhynchus mykiss LOEC Growth and development (ELS) 61 d 71.3 m Orvos Vascular plants Lemna gibba EC₅₀ Growth 7 d >62.5 n Reiss 1: h = hours, d = days 2: n = nominal concentration, m = measured concentration 3: Reiss = Reiss et al. 2001, Orvos = Orvos et al. 2002, NIVA = Hansen & Källqvist 2001 4: Acetone as carrier, may have resulted in free radicals (Reiss et al. 2001), exposure time from Orvos et al. (2002) 5: Study designed to avoid free radicals, i.e. NaOH as carrier (Reiss et al. 2001), exposure time from Orvos et al. (2002)