Table 1.

Comparisons of timing of developmental stages between zebrafish, rats and humans.

Developmental Stage	Zebrafish	Rat	Human
Blastula/Blastocyst	2–5 h	3–5 d	4–6 d
Implantation	n/a	6 d	8–10 d
Neural Plate	10 h	9.5 d	17–19 d
Neural Tube	18–19 h	9–12 d	22–30 d
First Heartbeat	24 h	10.2 d	22 d
Birth/Hatching	48–72 h	21 d	253 d

Embryological stages in zebrafish,⁽⁵⁹⁾ 9–12 days in rats⁽⁶⁰⁾ and 22–30 days in humans.^(61–63)