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The short-term toxicity of hydrazine towards fish (Lebsistes reticulatus) is characterized by an LC50(96 h) of 0.61 mg/L (Slonim, 1977). Exposure concentrations were proved indirectly through testing adverse effects of an altered test solution containing hydrazine towards the test animals.

For hydrazine an EC50(48 h) of 0.175 mg/L (mean of two separate tests) was observed with respect to the immobilization of daphnids (Velte, 1984), whereas exposure concentrations were proved by analytical measurements.

The long-term toxicity of hydrazine towards invertebrates was investigated yielding a NOEC(21 d) of 0.010 mg/L having reproduction as most sensitive end point (Currenta, 2010b). The test evaluation was based on time-weighted means of the measured concentrations.

The adverse effects hydrazine towards the growth of aquatic algae are characterized by an ErC50(48 h) of 0.017 mg/L as well as a NOEC of 0.006 mg/L referring to the reduction of the growth rate (Currenta, 2009).

The toxicity of hydrazine towards microorganisms is characterized by an EC50(3 h) of 5.5 mg/L (nominal) testing the respiration rate of activated sludge (Currenta, 2010c).