Fig. 3.High temperature treatment induces sterility in the ovary of the 100-dah stage Nile tilapia. (A) A section of the control fish ovary exposed to 27C for 60 days, with
different stages of oocytes. (B) A section of the ovary of the 100-dah stage fish exposed to 37C for 60 days, with complete absence of germ cells. (C) A section of the ovary of
the fish exposed to 37C for 60 days and after rearing in normal temperature for 5 months. Germ cells did not repopulate in 5 months. OC = ovarian cavity; PVO = oocytes at
the pre-vitellogenic stage; SC = steroid producing cells. Scale bars represent 20lm.