| During this period dividing cells were easily distinguishable prior to blastodisc formation, and little change in morphometry occurs. |
| The teleost embryo first appears as a clump of cells along the thickened margin of the blastodisc. |
| Early cell divisions were evident at the animal pole and eventually formed the blastodisc. |
| As a result, the blastodisc on the yolk becomes a blastoderm. |
