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The assessment of animal reproductive performance (both for males and females) is essential in the ecotoxicology field. There is proven evidence that some chemicals can affect sexual function, fertility, and development in animals. Therefore, reproductive and developmental toxicology remains an evolving field that is constantly under public scrutiny. As technology and scientific knowledge advance, regulatory agencies are demanding new types of data derived from studies that minimize animals' use following the 3 R's: replacement, reduction, and refinement. Zebrafish is the best tool to achieve this.
In vivo assessment of compounds disruptive power in complete organisms.Reproductive and developmental toxicology is easy to test in zebrafish.
In vivo assessment of compounds disruptive power in complete organisms.
Reproductive and developmental toxicology is easy to test in zebrafish.
This test has been adapted to adult zebrafish from the OECD421 guideline for reproduction toxicity.
We analyze several parameters as bodyweight changes of the adults during the assay, egg production, fertilization rate, hatching rate, the number of ovulated eggs, the toxic response data by sex and dose, the gonadosomatic index (GSI), and the hepatosomatic index (HSI), 17β-estradiol (E2), testosterone (T), and vitellogenin (Vtg) concentrations. Also, histological alterations in the gonads and livers could be measured. At the end of all tests, ovaries and sperm tissues will be collected, and mRNAs will be extracted for retrotranscription. cDNA will be used for qRT-PCR to analyze the expression of specific markers.