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Short-term toxicity to fish

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Description of key information

(96h) LL50 >1000 mg/L (B. rerio)

Key value for chemical safety assessment

Additional information

The short-term toxicity of GTL Base Oil Distillates to freshwater fish Brachydanio rerio (zebra fish) has been determined; the test was conducted in accordance with OECD Test Guideline 203.

Water-accommodated fractions (WAFs) of the sample were prepared in jars, by stirring for approximately 24 hours. The contents of the vessels were left to stand for 2 hours before drawing off the aqueous phase – the WAF – for testing. Semi-static exposures were then carried out.

The test was conducted in accordance with GLP and the TOC of test media were analysed for stability and exposure concentration. Total Organic Carbon (TOC) analysis of the freshly prepared test preparations showed amount of carbon present within the 1000 mg/l loading rate WAF test vessels to range from 1.71 mg C/l to 1.79 mg C/l. TOC analysis of the old test media showed amount of carbon present to range from 1.56 mg C/l to 1.64 mg C/l. There was no significant difference in TOC content between control and exposure vessels. This was expected by the authors due to the low water solubility of the test substance. 

The test results, expressed as the LL50value, showed that GTL Base Oil Distillates was not hazardous to fish at a loading rate of 1000 mg/l WAFs.