TELEOST EMBRYOLOGY
The purpose of today's laboratory is to introduce you to the sequence of developmental events that transforms a fertilized egg into a young fish. You will be provided with medaka eggs and larvae in varying stages of development. Examine this material carefully under the microscope. Then, with the aid of the morphometric information in your medaka manual and the photographic slides, determine the developmental stages for each of the collections.
With the help of the attached diagram and your manual locate the following structures:
|
Stage number |
Structures |
|
3 |
Capsular and vitelline membranes |
|
|
Perivitelline space |
|
|
Blastoderm (germinal disc) |
|
|
Yolk |
|
|
Oil globules |
|
|
|
|
4 |
Two blastomeres |
|
|
|
|
10 |
Early high blastula |
|
|
Periblast |
|
|
Blastocoel |
|
|
|
|
17 |
Blastoderm |
|
|
Blastopore |
|
|
Yolk plug |
|
|
Neural keel |
|
|
|
|
21 |
Anterior somites |
|
|
Kupffer's vesicle |
|
|
Optic Cups |
|
|
Pericardial Cavity |
|
|
|
|
23 |
Heart |
|
|
Otocysts |
|
|
|
|
28 |
Pectoral fin buds |
|
|
Circulation |
|
|
Darkened retina |
|
|
|
|
33 |
Swim bladder |
|
|
Liver |
|
|
Urinary bladder |
|
|
Intestine |
|
|
Fin fold |
|
|
|
|
36 |
Caudal rays |
|
|
Yolk sac |
|
|
Oil globule |
|
|
|
|
|
|