“…Nevertheless, upon stimulation with estrogenic substances, blood plasma VTG protein levels in male fish can attain the same range as in mature females (Purdom et al, 1994;Korte et al, 2000). As methods to detect VTG synthesis both at the protein (Mourot and Le Bail, 1995;Monteverdi and Di Giulio, 1999;Parks et al, 1999;Tyler et al, 1999;Folmar et al, 2000) and at the mRNA level (Flouriot et al, 1996;Folmar et al, 2000;Korte et al, 2000) have been developed in recent years, this model offers a sensitive and specific means to detect estrogenic influences in male fish.…”