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Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri
Published on: April 24, 2018
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Extending international toxicity testing guidance to middle eastern test species
Josh D Butler1, Linso Varghese1, Nandita Deb1
1Environmental Management Division, ExxonMobil Research Qatar, Qatar Science and Technology Park, Tech 2, PO Box 22500, Al Wosail Tower, Doha, Qatar.
The Science of the Total Environment
|February 1, 2020
Summary
This study developed standardized toxicity testing for Arabian Gulf species, establishing reliable data for environmental risk assessment. Standardized methods and passive dosing ensured accurate toxicity benchmarks for local aquatic organisms.
Area of Science:
- Environmental Toxicology
- Ecotoxicology
- Marine Biology
Background:
- The Arabian Gulf's unique ecosystems and inhabitants are understudied regarding toxicity.
- Existing international toxicity testing guidelines lack regionally relevant species.
- Reliable toxicity data is crucial for environmental risk assessment in this region.
Purpose of the Study:
- To develop standardized acute toxicity testing conditions for key Arabian Gulf indigenous species.
- To adapt international testing guidelines (OECD, ISO) for regional applicability.
- To generate reliable ecotoxicity data for aromatic hydrocarbons (AHs) in the Arabian Gulf.
Main Methods:
- Selected indigenous species: copepod, cyanobacteria, and juvenile killifish.
- Conducted acute exposures to four aromatic hydrocarbons (log KOW 3.88-5.19) using passive dosing (PD).
- Followed modified ISO and OECD guidelines for test durations (48-96 h).
Main Results:
- Passive dosing maintained stable aqueous concentrations of tested aromatic hydrocarbons.
- Generated acute toxicity data comparable to similar taxonomic groups globally.
- Calculated critical target lipid body burdens consistent with the Target Lipid Model.
Conclusions:
- Established standardized testing protocols for Arabian Gulf species.
- Validated the use of passive dosing for consistent aromatic hydrocarbon exposure.
- Provided crucial ecotoxicity data and validated predictive models for regional risk assessment.
