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Ecotoxicological information

Long-term toxicity to fish

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Administrative data

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Description of key information

(33d) NOELR ≥100 mg/L  (P. promelas) 

Key value for chemical safety assessment

Additional information

A Fish Early Life Stage study has been conducted with GTL Base Oil Distillates using the freshwater speciesPimephales promelas (fathead minnow). The test was conducted in accordance with OECD 201 and was compliant with GLP. TOC content was analysed in the test media for stability and exposure concentration.

Newly laid eggs were exposed to water accommodated fractions (WAFs) of the test material over a range of nominal loading rates of 10, 32 and 100 mg/l for a period of 33 days at a temperature of 25°C ± 2°C under semi-static test conditions. 

There were no significant mortalities or sub-lethal effects at any loading rate. The mean hatching rate ranged from 87 to 92% and the mean survival rate ranged from 81 to 98%. There were no statistically significant reductions in mean fish length or dry weight between the control group and the 32 and 100 mg/l WAFs loading rate. However the observations at the 10 mg/l loading rate WAF were significantly different from the control. This was considered by the authors to be due to normal biological varation. The report concluded that there were no effects on survival or growth of newly laid eggs of fathead minnows when exposure to loading rates up to 100 mg/l GTL Distillates. The No Observed Effect Loading Rate (NOELR) was therefore determined to be at least 100 mg/l.

Total Organic Carbon (TOC) analysis of the freshly prepared test preparations showed amount of carbon present within the 10, 32 and 100 mg/l loading rate WAF test vessels to range from less than the limit of quantitation (LOQ) for the method (1.0 mg C/l) to 11.64 mg C/l. TOC analysis of the old test media showed amount of carbon present to range from less than the LOQ to 2.75 mg C/l There was no significant difference in TOC content between control and exposure vessels. This was expected due to the low water solubility of the test substance.