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Related Experiment Video

Updated: Jul 10, 2026

Experimental Protocol for Examining Behavioral Response Profiles in Larval Fish: Application to the Neuro-stimulant Caffeine
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Experimental Protocol for Examining Behavioral Response Profiles in Larval Fish: Application to the Neuro-stimulant Caffeine

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Assessing caffeine as an emerging environmental concern using conventional approaches.

M T Moore1, S L Greenway, J L Farris

  • 1Agricultural Research Service, National Sedimentation Laboratory, Water Quality and Ecology, United States Department of Agriculture, PO Box 1157, Oxford, MS 38655, USA, mtmoore@ars.usda.gov

Archives of Environmental Contamination and Toxicology
|October 25, 2007
PubMed
Summary

Caffeine in wastewater poses minimal risk to freshwater life. Studies show low lethal and sublethal effects on key species like Ceriodaphnia dubia and Pimephales promelas.

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Published on: May 10, 2016

Area of Science:

  • Environmental Science
  • Ecotoxicology
  • Aquatic Toxicology

Background:

  • Organic wastewater contaminants, including pharmaceuticals, caffeine, and nicotine, are increasingly detected in water bodies.
  • The ecological impact of caffeine on freshwater organisms remains poorly understood despite its presence in streams.

Purpose of the Study:

  • To assess the lethal and sublethal effects of caffeine on three key freshwater species: Ceriodaphnia dubia, Pimephales promelas, and Chironomus dilutus.
  • To evaluate caffeine's potential risk to aquatic ecosystems.

Main Methods:

  • Organisms were exposed to aqueous caffeine solutions under static 48-hour acute and 7-day chronic exposure conditions.
  • Lethal concentrations (LC50) and sublethal effects (IC50) on reproduction and growth were measured.
  • Standard testing species were used to simulate effluent monitoring scenarios.

Main Results:

  • Ceriodaphnia dubia exhibited higher sensitivity to caffeine (48-hr LC50 = 60 mg/L) compared to Pimephales promelas (LC50 = 100 mg/L) and Chironomus dilutus (LC50 = 1,230 mg/L).
  • Seven-day exposures showed similar LC50 values for C. dubia (46 mg/L) and P. promelas (55 mg/L).
  • Sublethal effects included impaired reproduction in C. dubia (IC50 = 44 mg/L) and inhibited growth in P. promelas (IC50 = 71 mg/L).

Conclusions:

  • Caffeine exhibits varying toxicity across different freshwater species, with invertebrates like C. dubia being more sensitive.
  • Sublethal effects on reproduction and growth were observed at specific concentrations.
  • Considering environmental concentrations and degradation rates, caffeine is unlikely to pose a significant risk to most aquatic organisms.