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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

96h LC50 > 100 mg/L

96h NOEC >= 100 mg/l

Key value for chemical safety assessment

Additional information

Two data are available for this endpoint.

In the first study (Safepharm, 1992), the acute toxicity of the test substance ITC 288/S to Rainbow trout was determined in a 96-hour semi-static limit test according to the method C.1 of EEC Directive 84/449 (previous version of the EEC Directive 92/69), OECD Guideline No. 203 (1984) and GLP.

 The nominal test substance concentration tested was 100 mg/L. A control group was tested in parallel.

 At the start and the end of the test, the analytically determined concentrations of the test substance in the test media were between 89.5 and 96.2% of the nominal values. Thus, it was demonstrated that the test substance was stable during the test period, and the reported biological results are based on the nominal test substance concentrations.

 As no mortality was observed during the exposition period, the 96-hour LC50 of ITC 288/S was > 100 mg/L and the 96 -hour NOEC of ITC 288/S was >= 100 mg/L.

 Based on these results, ITC 288/S should not be considered as harmful to the aquatic organisms tested.

The second study available (Kurume Laboratory, 2000) isa preliminary test of a bioaccumulation study. The acute toxicity of the test substance ITC 288/S to Oryzias latipes was determined in a 96-hour semi-static test according to a Japanese Industrial Standard.

 The nominal test substance concentrations tested were 198, 296, 444, 667 and 1000 mg/L. A control group was tested in parallel.

 No analytical monitoring has been performed.

 At the test substance concentration of 1000 mg/L, 100% mortality was observed at 24 hours.

At the test substance concentration of 667 mg/L, 40% mortality was observed at 24 hours, 60% mortality was observed at 48, 72 and 96 hours

For the other test substance concentrations (i.e. 198, 296 and 444 mg/L) and control, no mortality has been observed.

The 96-hour LC50 of ITC 288/S was determined to be 623 mg/L.

 

As the first study (Safepharm, 1992) has been performed according to the OECD and EU guidelines, following the GLP, and that the validity criteria were fulfilled, this study is considered as reliable without restrictions. Moreover, among the two studies available, it gives the most conservative result, therefore is selected as key study.

The second study (Kurume Laboratory) is considered as reliable with restrictions because, even if the method is acceptable, some details on test method are lacking and no analytical monitoring has been performed. As the result obtained is consistent with the key study, it has been selected as supporting study.