Figure 2. Embryo development tracking by constructing artificial nest in ZS and GH bays in 2018. (A) Artificial fish nests were set in water at 16:00-17:00; (B) Artificial fish nests with fish embryo were cut off at the next morning (8:00-9:00); (C) Embryos were removed from the artificial fish nest within two hours (9:00-11:00); (D) Development progresses of embryos were observed by microscope; (E) Embryos collected from GH and ZS in 2018 at 11:00; (F) Embryo begins epiboly; (G) Embryo reaches semi-epiboly; (H) Embryo completes epiboly; and early developmental time scheme of embryos from GH (I) and ZS (J).