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Fig. 13. Light micrographs of abnormal gonads of eelpout embryos from the OP100 (100 µgl-1 4-tert-octylphenol) group at day 35 (15 November) showing transverse sections from the anterior end, central part and posterior end of the gonad. Scale bars, 100 µm. Paraffin section. Haematoxylin-eosin staining. (A—D) and (E—H) Abnormal gonad of embryos from two different mother fish. The abnormal gonads have structures resembling both male (two-lobed organ) and female (endo-ovarian cavity) gonads. (A,E) Anterior end; (B,C,F,G) central part; (D,H) posterior end. GC, germ cell; I, intestine; K, kidney; M, mesentery; OC, ovarian cavity.