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Sub Chronic Toxicity Study in Zebrafish – banner
Preclinical Research Guidelines

Sub Chronic Toxicity in Zebrafish

Overview

What is Sub-chronic Toxicity in Zebrafish?

Sub-chronic toxicity in zebrafish is the assessment of adverse effects caused by repeated or continuous exposure to a test substance for an extended period, usually from several weeks up to evaluate its potential toxic effects on survival, growth, behavior, and organ function.

Study period: Fish are observed throughout the entire exposure period, typically 28–60 days depending on study objectives and test design.

Regulatory Standards

OECD Test Guidelines

OECD test guidelines governing subacute toxicity studies across oral, dermal, and inhalation routes of administration.

OECD 215
↗

Fish, Juvenile Growth Test

Juvenile Growth Test

✓Validation Ready
Scientific Basis

Principles

Controlled aqueous exposure to multiple concentrations of a test substance.

Evaluation of survival, growth performance, behavior, and sublethal toxic effects during extended exposure.

Determination of concentration–response relationships to establish toxicological endpoints such as NOEC, LOEC, ECx, and LCx.

Study Goals

Objectives

Each subacute toxicity study is designed to achieve specific scientific and regulatory objectives.

  • 1
    To evaluate the toxic effects of a test substance following repeated or prolonged exposure to zebrafish.
  • 2
    To assess the impact of the test substance on survival, growth, behavior, and general health of zebrafish.
  • 3
    To determine concentration–response relationships and establish toxicological endpoints such as NOEC, LOEC, ECx, and LCx values.
Research Models

Experimental Animals

Standardized zebrafish models are selected based on regulatory acceptability and biological relevance.

Zebrafish Models
1Zebrafish (Danio rerio)
Facility Standards

Environmental Conditions

Controlled housing conditions are maintained throughout the study to minimize variability and ensure animal welfare compliance.

Test TemperatureSpecies-specific and maintained at a constant level throughout the study (for zebrafish typically 26 ± 1°C to 28 ± 1°C).
Photoperiod12–16 hours light and 8–12 hours dark.
Dissolved OxygenMaintained at ≥ 60% of the air saturation value throughout the test.
pHMaintained within the acceptable range for the test species and kept relatively constant during exposure.
Water QualityTest water should be clean, well- aerated, and free from contaminants that may interfere with the study.
Water RenewalExposure may be conducted under flow-through or semi-static conditions depending on the stability of the test substance.
Stocking DensityKept low enough to avoid stress and ensure normal growth.
FeedingFish should receive an appropriate diet daily according to the study design.
Exposure Methods

Routes of Administration

The route of administration is selected based on the intended use of the test substance and the applicable OECD guideline.

Aqueous Exposure

A method of exposure in which the test substance is dissolved or dispersed in water, allowing zebrafish to absorb the substance directly from their surrounding environment through the gills, skin, and other body surfaces.

Industry Use Cases

Applications

Sub-Acute toxicity studies are essential for determining the safety profile of a wide range of products before clinical use or regulatory approval.

  • Chemical substances

  • Industrial chemicals

  • Plant protection products (pesticides)

  • Biocidal products and related active substances

  • Pharmaceutical compounds

Guidelines Directory
oecd-203 fish acute toxicity-testoecd-210 fish early life stage toxicity-testoecd-229 fish short term reproduction assayoecd-230 21 day fish assay a screening test for estrogenic and androgenic activity and aromatase inhibitionoecd-234 fish sexual development testoecd-236 fish embryo acute toxicity fet-testoecd-305 bioaccumulation in fish aqueous and dietary exposureoecd-215 fish juvenile growth testoecd-402-acute-dermal-toxicityoecd-403 acute inhalation toxicityoecd-407 repeated dose 28 day oral toxicity study in rodentsoecd-408 repeated dose 90 day oral toxicity study in rodentsoecd-414 prenatal developmental toxicity studyoecd-420 acute oral toxicity fixed dose procedureoecd-421 reproduction developmental toxicity screening testoecd-422 combined repeated dose toxicity study with the reproduction developmental toxicity screening testoecd-423 acute oral toxicity acute toxic class-methodoecd-424 neurotoxicity study in rodentsoecd-425 acute oral toxicity up and down procedureoecd-429 skin sensitisation local lymph node assayoecd-443 extended one generation reproductive toxicity studyoecd-451 carcinogenicity studiesoecd-452 chronic toxicity studiesoecd-453 combined chronic toxicity carcinogenicity studiesoecd-203 fish acute toxicity-testoecd-210 fish early life stage toxicity-testoecd-229 fish short term reproduction assayoecd-230 21 day fish assay a screening test for estrogenic and androgenic activity and aromatase inhibitionoecd-234 fish sexual development testoecd-236 fish embryo acute toxicity fet-testoecd-305 bioaccumulation in fish aqueous and dietary exposureoecd-215 fish juvenile growth testoecd-402-acute-dermal-toxicityoecd-403 acute inhalation toxicityoecd-407 repeated dose 28 day oral toxicity study in rodentsoecd-408 repeated dose 90 day oral toxicity study in rodentsoecd-414 prenatal developmental toxicity studyoecd-420 acute oral toxicity fixed dose procedureoecd-421 reproduction developmental toxicity screening testoecd-422 combined repeated dose toxicity study with the reproduction developmental toxicity screening testoecd-423 acute oral toxicity acute toxic class-methodoecd-424 neurotoxicity study in rodentsoecd-425 acute oral toxicity up and down procedureoecd-429 skin sensitisation local lymph node assayoecd-443 extended one generation reproductive toxicity studyoecd-451 carcinogenicity studiesoecd-452 chronic toxicity studiesoecd-453 combined chronic toxicity carcinogenicity studiesoecd-203 fish acute toxicity-testoecd-210 fish early life stage toxicity-testoecd-229 fish short term reproduction assayoecd-230 21 day fish assay a screening test for estrogenic and androgenic activity and aromatase inhibitionoecd-234 fish sexual development testoecd-236 fish embryo acute toxicity fet-testoecd-305 bioaccumulation in fish aqueous and dietary exposureoecd-215 fish juvenile growth testoecd-402-acute-dermal-toxicityoecd-403 acute inhalation toxicityoecd-407 repeated dose 28 day oral toxicity study in rodentsoecd-408 repeated dose 90 day oral toxicity study in rodentsoecd-414 prenatal developmental toxicity studyoecd-420 acute oral toxicity fixed dose procedureoecd-421 reproduction developmental toxicity screening testoecd-422 combined repeated dose toxicity study with the reproduction developmental toxicity screening testoecd-423 acute oral toxicity acute toxic class-methodoecd-424 neurotoxicity study in rodentsoecd-425 acute oral toxicity up and down procedureoecd-429 skin sensitisation local lymph node assayoecd-443 extended one generation reproductive toxicity studyoecd-451 carcinogenicity studiesoecd-452 chronic toxicity studiesoecd-453 combined chronic toxicity carcinogenicity studies
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