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. 2018 Sep 22;13:327–334. doi: 10.1515/biol-2018-0040

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© 2018 Xiaowu Chen et al., published by De Gruyter

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Fish morphology and gonad histology of NT and NB. (A) Average body length and body weight of 2-month-old female NT, male NT, and NB. (B) and (C) indicate transverse sections of the testis and ovary of adult NT (4 months old). (D) and (E) indicate transverse sections of the testis and ovary of adult NB (4 months old). (F) and (G) indicate the immunological analysis of Cyp19a in the ovary of NT and NB. sl: seminiferous lobula; s1: spermatogonia; s2: spermatocytes; s3: spermatides; o: oocytes containing numerous vacuoles and deeply staining nucleus; so: small oocytes surrounded by still small oocytes; f: follicle cell; y: yolk; s: stroma of connective tissue; NT: Nile tilapia; BT: Blue tilapia; NB: tilapia hybrid.