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. 2010 Oct 8;119(3):306–311. doi: 10.1289/ehp.1002555

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Histological sections from gonads of male fish showing different degrees of intersexuality. (A) Nonintersex male fish (intersex index = 0); the lobules of the testis are full of mature spermatozoa (s). (B) Mildly intersex fish (intersex index = 0.33); small numbers of primary oocytes (po) were found among tissue that consisted mainly of mature spermatozoa. (C) Severely intersex fish (intersex index = 4.8); the gonad consisted of large numbers of primary oocytes, as well as some oocytes in more advanced stages and some that were degenerating (do) and/or vacuolated, all set among male tissue, most of which (in this fish) consisted of mature spermatozoa. Bars = 100 μm.