What question did this study set out to answer?

Determine chronic toxicity thresholds of waterborne radium-226 (226Ra) in early life stages of freshwater fish to support protective aquatic water quality guidelines.

August 20, 2026Ecotoxicology and Environmental SafetyOpen Access

Chronic toxicity thresholds for fish early life stages exposed to 226Ra in water

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Authors

EPEdgar Pérez CLCharlotte Lacroix-Durand KLKarsten Liber

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Overview

Ecotoxicity study reveals radium-226 reduces body length at low concentrations in freshwater fish early life stages, indicating current discharge limits may not be fully protective.

Key Points

Determine chronic toxicity thresholds of waterborne radium-226 (226Ra) in early life stages of freshwater fish to support protective aquatic water quality guidelines.
Exposed embryos of white sucker (Catostomus commersonii), rainbow trout (Oncorhynchus mykiss), and fathead minnow (Pimephales promelas) from fertilization (or 4 hours post-fertilization) to 0–62.5 Bq/L nominal 226Ra in soft or hard reconstituted water.
Evaluated endpoints at swim-up including mortality, developmental timing (eyed stage, hatch, swim-up), morphometrics (length, mass, condition), and deformities using traditional NOEC statistics and a mixed-model approach incorporating degree days.
Traditional statistical analysis yielded no observed effect concentrations (NOECs) of 62.5 Bq/L for all measured endpoints across all three fish species.
Mixed-model analysis incorporating time to swim-up in degree days identified lowest observed effect concentrations (LOECs) between 0.1 and 2.5 Bq/L for body length in O. mykiss and P. promelas.

Cite This Study

Pérez et al. (2026) studied this question.

synapsesocial.com/papers/6a86b4cb8a91293e6a1cc4c8 https://doi.org/10.1016/j.ecoenv.2026.120674

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August 20, 2026Ecotoxicology and Environmental SafetyOpen Access

Chronic toxicity thresholds for fish early life stages exposed to 226Ra in water

View Full Paper

Ask AI

Bookmark

Authors

EPEdgar Pérez CLCharlotte Lacroix-Durand KLKarsten Liber

Discussion

Member takes

Overview

Ecotoxicity study reveals radium-226 reduces body length at low concentrations in freshwater fish early life stages, indicating current discharge limits may not be fully protective.

Key Points

Determine chronic toxicity thresholds of waterborne radium-226 (226Ra) in early life stages of freshwater fish to support protective aquatic water quality guidelines.
Exposed embryos of white sucker (Catostomus commersonii), rainbow trout (Oncorhynchus mykiss), and fathead minnow (Pimephales promelas) from fertilization (or 4 hours post-fertilization) to 0–62.5 Bq/L nominal 226Ra in soft or hard reconstituted water.
Evaluated endpoints at swim-up including mortality, developmental timing (eyed stage, hatch, swim-up), morphometrics (length, mass, condition), and deformities using traditional NOEC statistics and a mixed-model approach incorporating degree days.
Traditional statistical analysis yielded no observed effect concentrations (NOECs) of 62.5 Bq/L for all measured endpoints across all three fish species.
Mixed-model analysis incorporating time to swim-up in degree days identified lowest observed effect concentrations (LOECs) between 0.1 and 2.5 Bq/L for body length in O. mykiss and P. promelas.

Cite This Study

Pérez et al. (2026) studied this question.

synapsesocial.com/papers/6a86b4cb8a91293e6a1cc4c8 https://doi.org/10.1016/j.ecoenv.2026.120674

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