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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

The chlorinated isocyanurates are unstable in the environment, because the free available chlorine is rapidly reduced.  CYA, or its salt, is the stable degradation product. Therefore, CYA, or its sodium salt, is the substance of interest for chronic ecotoxicity studies. A fish juvenile growth test with rainbow trout was performed with the monosodium salt of cyanuric acid (equivalent to 75.6% cyanuric acid) according to OECD 215. 

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater fish:
756 mg/L

Additional information

A fish juvenile growth test with rainbow trout was performed with the monosodium salt of cyanuric acid (equivalent to 75.6% cyanuric acid) according to OECD guideline 215. Fish were exposed for 21 days to nominal concentrations of 100, 180, 320, 560 and 1000 mg/L (equivalent to 76, 136, 242, 423 and 756 mg cyanuric acid/L).

Zero mortalities, no inhibition of tank average specific growth rate, no sublethal effects of exposure and no significant reduction in terms of the “pseudo” specific growth rate were observed when compared to the control group. The NOEC for cyanuric acid was determined to be 756 mg/L