- Your Product Type
- Your Study Type
- Aquatic Ecotoxicology
- Aquatic Invertebrates
- OECD 202: Daphnia sp., Acute Immobilisation Test
- OECD 211: Daphnia magna Reproduction Test
- OECD 235: Chironomus sp., Acute Immobilisation Test
- OECD 218/219: Sediment-Water Chironomid Toxicity Test Using Spiked Sediment/Spiked Water
- OECD 233: Sediment-Water Chironomid Life-Cycle Toxicity Test Using Spiked Water or Spiked Sediment
- OECD 225: Sediment-water Lumbriculus Toxicity Test Using Spiked Sediment
- OECD 242: Potamopyrgus antipodarum Reproduction Test
- OECD 243: Lymnaea stagnalis Reproduction Test
- Fish and other vertebrates
- OECD 203: Fish, Acute Toxicity Test
- OECD 215: Fish Juvenile Growth Study
- OECD 212: Fish, Short-term Toxicity Test on Embryo and Sac-fry Stages
- OECD 231: The Amphibian Metamorphosis Assay
- OECD 236: Fish Embryo Acute Toxicity Test
- OECD 210: Fish, Early-life Stage Toxicity Test
- OECD 229 Fish Short Term Reproduction Assay and OECD 230 21-day Fish Assay
- OECD 240 Medaka Extended One Generation Reproduction Test (MEOGRT)
- OECD 248: Xenopus Eleutheroembryo Thyroid Assay
- OPPTS 850.1500: Fish Life Cycle Toxicity Test
- OÈCD 234 Fish sexual development test
- Aquatic plants
- Analytical Dose Verification
- Aquatic Invertebrates
- Chemistry
- Biodegradation Studies
- Analytical Chemistry Studies and Residues
- Physical-Chemical Properties Studies
- Storage Stability Studies
- OPPTS 830.6302, OPPTS 830.6303,and OPPTS 830.6304: Physical State, Colour and Odor at 20 °C and at 101.3 kPa
- EU A.1: Melting temperature/range
- EU A.2: Boiling temperature
- EU A.3: Relative density (liquids and solids)
- EU A.4: Vapour pressure
- EU A.5: Surface tension
- EU A.9: Flashpoint
- EU A.10: Flammability (solids)
- EU A.12: Flammability (contact with water)
- EU A.13: Pyrophoric properties of solids and liquids
- EU A.16: Relative self-ignition temperature for solids
- EU A.17: Oxidising properties
- OECD 114: Viscosity of Liquids
- Environmental Fate
- Transformation in Soil
- Transformation in Water
- Transformation in Manure
- Adsorption on Soil and Sewage Sludge
- Bioaccumulation and Bioconcentration
- Terrestrial Ecotoxicology
- Non-target Arthropods
- Non-target arthropod testing with the parasitic wasp (Aphidius rhopalosiphi)
- Non-target arthropod testing with the lacewing (Chrysoperla carnea)
- Non-target arthropod testing with the ladybird beetle (Coccinella septempunctata)
- Non-target arthropod testing with the predatory bug (Orius laevigatus)
- Non-target arthropod testing with the predatory mite (Typhlodromus pyri)
- Non-target arthropod testing with the rove beetle (Aleochara bilineata)
- Non-target arthropod testing with the carabid beetle (Poecilus cupreus)
- Non-target arthropod testing with the wolf spider (Pardosa spec.)
- Soil Organisms
- Honey Bees and other Pollinators
- OECD 213/214: Honey bees, Acute Oral and Acute Contact Toxicity Test
- OECD 245: Honey Bee (Apis Mellifera L.), Chronic Oral Toxicity Test (10-Day Feeding)
- OECD 237: Honey Bee Larval Toxicity Test, Single Exposure
- OECD 239: Honey Bee Larval Toxicity Test
- EPPO 170: Honey Bee Field Study – do plant protection products effect honey bee colonies?
- Oomen et al. 1992: Honey Bee Brood Feeding Study
- OECD 75: Honey Bee Brood Test under Semi-field Conditions in Tunnels
- OECD 246/247 Acute Oral and Contact Toxicity to the Bumblebee, Bombus terrestris L.
- Solitary Bee Acute Contact Toxicity Study in the Laboratory (Osmia sp.) Solitary Bee Acute Oral Toxicity Study in the Laboratory (Osmia sp.) (protocols for ringtests with solitary bees recommended by the non-Apis working group)
- SANTE/11956/2016 rev.9 Residue trials for MRL setting in honey
- Non-target plants
- OECD 208: Terrestrial Plant Test - Seedling Emergence and Seedling Growth Test
- OECD 227: Terrestrial Plant Test - Vegetative Vigour Test
- OCSPP 850.4100: Seedling Emergence and Seedling Growth
- OCSPP 850.4150: Vegetative Vigor
- EPPO PP 1/207(2): Efficacy evaluation of plant protection products, Effects on succeeding crops
- Field Studies
- Non-target Arthropods
- Ecological Modelling
- Quality Assurance
- Testing of Potential Endocrine Disruptors
- Aquatic Ecotoxicology
- News
- Company
- Who we are
- Company history
- Staff
- Sabrina Westphal
- Dr. Ralf Petto
- Dr. Melanie Lichtenberger
- Dr. Maria Meinerling
- Frank Ströhle
- Dr. Mercedes Dragovits
- Christine Rushby
- Feride Karabiyik
- Dr. Saúl Molina-Herrera
- Christiane Rutschmann-Fröhlich
- Thomas Deierling
- Jan Schostag
- Sabine Schwientek
- Dr. Benoit Goussen
- Dr. Patrick Riefer
- Dr. Anja Meister-Werner
- Martina Schmalhorst
- Our Certificates
- Career
- Contact
OECD 234 Fish Sexual Development Test
This test assesses the effects on early-life stages and sexual development of fish starting with newly fertilised eggs until the fish are sexually differentiated. The main endpoints of the study are vitellogenin (VTG) concentration and sex ratio. The combination of these endpoints allows the detection of the mode of action of an endocrine disruptor.
Test Organisms
- Oryzias latipes (Japanese medaka), recommended species because of genetic sex markers,
- Danio rerio (zebrafish)
- Gasterosteus aculeatus (three spined stickleback)
The Japanese medaka is the recommended species because genetic sex markers can be used to identify the genetic sex, it is fully validated and has analysable secondary sex characteristics.
Course of the test
This study is a long-term study of approximately 60 days post-hatch for zebrafish, three-spined sticklebacks and medaka. Fertilised eggs are exposed to five different concentrations of a chemical in a flow-through system. Four replicates with 30 eggs in each replicate are prepared and observed until gonad development of the juveniles.
Endpoints
The endpopints of the study enables the detection of chemicals with androgenic or oestrogenic properties as well as anti-androgenic, anti-oestrogenic and steroidogenesis inhibiting properties.
- Vitellogenin
- sex ratio (the sex ratio is based on genetic sex (for Japanese medaka) or phenotypic sex by gonadal histology examination)
- survival
- hatching success
- lenght
- body weight
- abnormal behaviour
- morphological abnormalities
- Secondary sex characteristics are observed for Japanese medaka.
Guidelines and literature
- OECD Guideline for Testing of Chemicals, Test No. 234: Fish Sexual Development Study.