Zebrafish - Gastrula Period

The duration of this period is from 5.25 to 10.33 hours

• Transition from 50% epiboly to 1-4 somites

• Primary germ layers (also known as 'germ ring') are produced during this stage

• Each germ layer (endoderm, mesoderm, ectoderm) is put in the right place so that bodily organs and tissues can form in the correct locations

• Involution produces the germ ring by folding the blastoderm back upon itself

• The gastrula period ends when epiboly is complete, and the tail bud has form

Zebrafish: Timeline and Staging of Embryonic Development