Later Stages of
Development


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Developmental Biology Laboratory
Observations of the Zebrafish Embryo


Gastrula Period (5.3-10 h)

5.3h.jpg (60664 bytes)

5.7h.jpg (121635 bytes)

 6h.jpg (123432 bytes) 8h.jpg (67804 bytes) 9h.jpg (65337 bytes) 10h.jpg (63399 bytes)
50% epiboly
(5.3 h)		 germ ring
(5.7 h)		 shield
(6 h)		 75% epiboly
(8 h)		 90% epiboly
(9 h)		 bud
(10 h)

Morphogenetic movements of involution, convergence, and extension form the epiblast, hypoblast, and embryonic axis through the end of epiboly.


Segmentation Period (10-24 h)

11h.jpg (25348 bytes)

12h.jpg (93338 bytes)

14h.jpg (111883 bytes)

16h.jpg (35567 bytes)

18h.jpg (45411 bytes)
3-somite
(11 h)		 6-somite
(12 h)		 10-somite
(14 h)		 14-somite
(16 h)		 18-somite
(18 h)
19_5.jpg (30153 bytes) 22h.jpg (59408 bytes)
21-somite
(19.5 h)		 26-somite
(22 h)

Somites, pharyngeal arch primordia, and neuromeres develop; primary organogenesis; earliest movements; the tail appears

 

Pharyngula Period (24-48 h)

prim6.jpg (42477 bytes) prim16.jpg (42338 bytes) prim-22.jpg (34817 bytes) 42h.jpg (41380 bytes)
Prim-6
(25 h)		 Prim-16
(31 h)		 Prim-22
(35 h)		 High-pec
(42 h)

Phylotypic-stage embryo; body axis straightens from its early curvature about the yolk sac; circulation, pigmentation, and fins begin development.

 

Hatching Period (48-72 h)

 48h.jpg (43562 bytes) 60h.jpg (42010 bytes) 72h.jpg (59348 bytes)
long-pec
(48 h)		 pec-fin
(60 h)		 protruding mouth
(72 h)

Completion of rapid morphogenesis of primary organ systems; cartilage development in head and pectoral fin; hatching occurs asynchronously. At 72 h, swim bladder inflates; food-seeking and active avoidance behaviors.

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