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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

In a 96 h study for calcium iodate on Danio rerio, at a test concentration of 100 mg/L, the fishes were found to be freely swimming in the bowl aquaria without showing any abnormal symptoms. No mortalities were observed at the test concentration of 100 mg/l. No mortalities were found in the control aquaria. Hence the LC0 value was considered to be 100 mg/l

Key value for chemical safety assessment

Additional information

Based on the various studies available with Klimish rating 2and 4 for the target substance Calcium iodate and read across substances and based on the category approach of organic functional group along with similar mechanistic approach and having structural similarities defined by QSAR toolbox. The results is summarized as follows

 

Sr.No

Endpoint

Effect values

Basis for effects

Duration

Species

Remarks

1

LC0

100 mg/l

mortality

96 hrs

Danio rerio

Study Report for target chemical

2

NOEC

100 mg/l

mortality

7 days

Danio rerio

Study Report for target chemical

3

LC50

558.5557 mg/l

mortality

96 hrs

Oncorhynchus mykiss

Predicted data for target chemical

4

LC50

350 mg/l

mortality

96 hrs

Oncorhynchus mykiss

Data from publication for CAS no 7681-55-2

5

LC50

896 mg/l

mortality

96 hrs

Oncorhynchus mykiss

Data from publication for CAS no 7681-11-0

 

By applying weight of evidence approach to the studies summarized in the above table it can be observed that the LC0 value was found to be 100 mg/l in 96 hrs study and the LC50 values was found to be in range of 350 to 896 mg/l in 96 hrs on the basis of mortality effect . Thus according to CLP criteria of aquatic classification it is concluded that the substance Calcium iodate is not toxic to Fish (Danio rerio, Oncorhynchus mykiss)