 Also, they found differences in the proportion of testicular and ovarian tissue and its degree of organization between the intersex fish.Furthermore, xenoestrogens expose fish to CYP1A inducers through inhibiting a putative labile protein and enhancing the Ah receptor, which has been linked to epizootics of cancer and the initiation of tumors.The induction of CYP1A has been established to be a good bioindicator for xenoestrogen exposure.