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Updated: Apr 21, 2026

Using Chicken Embryo as a Powerful Tool in Assessment of Developmental Cardiotoxicities
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The fish embryo test (FET): origin, applications, and future.

Thomas Braunbeck1, Britta Kais2, Eva Lammer2

  • 1Aquatic Ecology and Toxicology Group, Center for Organismal Studies, University of Heidelberg, Im Neuenheimer Feld 230, 69120, Heidelberg, Germany. braunbeck@uni-hd.de.

Environmental Science and Pollution Research International
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PubMed
Summary

The fish embryo test (FET) using zebrafish is a validated alternative to adult fish toxicity testing, aligning with ethical animal use principles and regulations. This method assesses aquatic toxicity effectively, supporting environmental safety evaluations.

Keywords:
Acute toxicityAlternative test methodBiotransformationCytochrome P450Endocrine disruptionFETFish embryo testGenotoxicityNeurotoxicityOECD guidelineTeratogenicityValidation

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Area of Science:

  • Ecotoxicology
  • Developmental Toxicology
  • Aquatic Toxicology

Background:

  • The acute fish toxicity test (OECD TG 203) is a standard method for assessing aquatic toxicity.
  • Ethical considerations and regulations (European Directive 2010/63/EU) promote alternatives to animal testing.
  • The fish embryo test (FET) with zebrafish (Danio rerio) was developed as an alternative to traditional fish toxicity tests.

Observation:

  • The FET (OECD TG 236) has been optimized, standardized, and validated.
  • It shows excellent correlation with the acute fish toxicity test.
  • Non-feeding embryonic stages are not protected under current animal use directives, making FET ethically favorable.

Findings:

  • The FET is suitable for range-finding and as a direct alternative to the acute fish toxicity test.
  • Concerns regarding biotransformation capacity and substance accessibility (lipophilic/high molecular weight) have been addressed.
  • Most biotransformation processes are present in zebrafish embryos, and extended test durations compensate for reduced access to larger molecules.

Implications:

  • The FET is ready for regulatory use, supporting national and international chemical safety assessments.
  • It serves as a refinement (3Rs principle) or a full alternative to adult fish testing.
  • Extended endpoints allow FET to detect teratogenicity, genotoxicity, neurotoxicity, and endocrine disruption, enhancing its utility in comprehensive risk assessment.