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Environmentally Realistic Metal Mixture Concentration Impacts Early Development in Zebrafish Larvae.

Anderson K S Macêdo1,2, Willian A Thompson1,3, Hélio B Santos2

  • 1Department of Biological Sciences, University of Calgary, Calgary, Alberta, Canada.

Environmental Toxicology
|April 21, 2026
PubMed
Summary
This summary is machine-generated.

Metal mixtures in aquatic ecosystems disrupt fish early development, affecting heart rate and behavior. Individual metal toxicity doesn

Keywords:
ELScadmiumdevelopmental rateironlocomotor activitymanganesemetal toxicitysomitogenesisthigmotaxis

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Area of Science:

  • Environmental toxicology
  • Aquatic ecology
  • Developmental biology

Background:

  • Metal dispersion in ecosystems creates complex mixtures impacting aquatic life.
  • Few studies examine the effects of metal mixtures on fish early development.

Purpose of the Study:

  • Investigate the impact of iron (Fe), manganese (Mn), and cadmium (Cd) mixtures on zebrafish (Danio rerio) early development.
  • Compare the toxicity of individual metals versus a mixture at environmentally relevant concentrations.
  • Assess effects on developmental rate, heart rate, behavior, and stress responses.

Main Methods:

  • Zebrafish larvae were exposed to individual metals (Fe, Mn, Cd) and a mixture.
  • Evaluated developmental endpoints: somitogenesis, hatching, heart rate, and locomotor activity.
  • Assessed behavioral responses (thigmotaxis) and stress indicators (cortisol, glucose, protein).

Main Results:

  • Individual metals, particularly Cd and Mn, impaired zebrafish development and behavior.
  • The metal mixture affected developmental markers (somitogenesis, hatching, heart rate) but not larval behavior.
  • No significant changes in whole-body cortisol, glucose, or protein levels were observed after 6-day exposure.
  • Mixture toxicity differed from individual metal effects, indicating complex interactions.

Conclusions:

  • Metal mixtures in aquatic environments like the Doce River basin can alter fish early development.
  • Individual metal toxicity data may not accurately predict mixture toxicity in risk assessments.
  • Understanding mixture effects is crucial for protecting native fish species and their stress coping mechanisms.