Histology of gonads of solvent controls (A) and fish exposed to the highest concentration (1000 ng/L) of five different class steroids (Clo, TRI, E2, AD, P4) (B). Shown are typical pictures of one fish each. Control fish show large mature vitellogenic oocytes. They are lacking in the five steroids class mixture, where previtellogenic stages dominate.


Acknowledgments
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