Expression of vitellogenin in the testis and kidney of the spotted ray Torpedo marmorata exposed to 17β-estradiol

► E2 induces VTG expression in male germ cells of the cartilaginous fish Torpedo. ► Torpedo testis is a suitable model to study the gene expression in spermatogenesis. ► Torpedo is a suitable bioindicator to detect the presence of estrogenic pollutant.