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Rapid Evaluation of Toxicity of Chemical Compounds Using Zebrafish Embryos
Published on: August 25, 2019
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Incorporating benchmark dose into sediment toxicity testing using zebrafish (Danio rerio)
Sarah Nash1, Colby Hietpas1, Seenivasan Subbiah1
1Department of Environmental Toxicology, Texas Tech University, Lubbock, TX, USA.
The Science of the Total Environment
|March 1, 2025
Summary
This study introduces a new benchmark dose (BMD) method using zebrafish embryo toxicity assays for assessing organic pollutant toxicity in sediments. This approach better represents sub-acute effects, improving ecological risk assessments for contaminated environments.
Area of Science:
- Environmental Toxicology
- Ecotoxicology
- Aquatic Toxicology
Background:
- Mortality is a common endpoint in sediment risk assessment for organic pollutants.
- The zebrafish embryo toxicity assay (zFET) offers data on mortality and malformations.
- Benchmark dose (BMD) calculations can enhance toxicity assessments.
Purpose of the Study:
- To assess sediment chemical extract toxicity using a zebrafish benchmark dose (zfBMD) approach.
- To compare zfBMD with hazard index calculations from chemical analysis.
- To evaluate the utility of zfBMD in sediment toxicity assessments.
Main Methods:
- Collected sediment from Texas resacas for toxicity assessment.
- Performed chemical analysis of 95 organic contaminants.
- Utilized EPA's BMD software with zebrafish mortality, malformation, and behavior data.
Main Results:
- The zfFET assay correlated with seasonal pesticide applications (pyrethroids, neonicotinoids, organophosphates).
- BMD calculations revealed sub-acute toxicity, with malformations and behavioral changes occurring at low concentrations.
- Sediment extracts showed varying toxicity levels across different locations and sampling events.
Conclusions:
- The zfBMD approach provides a framework for improved sediment toxicity assessments.
- This method offers better representation of sub-acute toxicity compared to traditional methods.
- zfBMD can aid in ecological risk assessments of contaminated sediments using fish embryo-larvae data.
