How to hatch a Medaka Egg: Timmy

Medaka Egg Project By Morgan McFarland

Timmy: Japanese Medaka Egg

• As I was laid by my mother with hundreds of brothers and sisters, I rolled around in my egg.

• I am being examined by Morgan McFarland and Alysha Bridge.

• Its hard to tell what’s happening next except for when they talk about how I keep moving to different stages.

Approximately 20 hours old

• I am growing very quickly, I am moving through stages like crazy!

• This is me at 20 hours old, this is about stage 16.

• ¾ of my yolk is covered by the blastoderm and has expanded to the equator of the yolk sphere.

52 Hours: Stage 24

• I now have an early heartbeat which pulses about 40 to 60 beats per minute.

• It’s kind of weird being in this narrow tube that is completely ventral to my head.

• I don’t have any circulation yet though although blood islands group on my yolk.

74 Hours: Stage 28

• Yay! I finally have pink blood. My heart is bent so that my ventricle is lying on my right side.

• I am now having about 136 heart beats per minute.

• My pink blood is pumping out of my heart through a tube.

102 Hours: Stage 30

• My urinary Bladder is seen slightly.

• My heartbeat is clearly seen with about 168 beats per minute.

• Ouch! I think I am “jabbing” myself in the eye with the end of my tail.

• OOOH! And I forgot to tell you, my pectoral fin is starting to move too.

• I’m getting excited, I think I’m going to hatch soon

168 Hours: Stage 34

• My heart rate is starting to slow down a little by having 124 beats per minute.

• My jaw is slightly moving and I’m starting to turn yellow.

• My tail is still poking me in the eye and I’m really getting irritated.

• Also, my dorsal fin is present; but not spotted as easily.

200 Hours: Stage 35

• You can see my spleen and mouth! My heart beats 136 per minute.

• My color intensity and initial shape are variable. My liver is also seen.

• My mouth is moving once in a while, and I have weird spots on my back.

• My yolk sac is devoid of pigment cells and I didn’t start to hatch yet. Maybe tomorrow!!

• I sure hope I hatch soon because I am getting sick of being squashed!

Over 200 Hours: End of Stage 35

• The only difference of my body from yesterday is that my spleen and other parts are getting more noticeable.

• I had 138 heart beats per minute!

• Everything else is the same except for I’m getting more and more anxious to get out of this egg!!

Day 12: Stage 36

• I was hatched!

• My owners were so happy today when I was swimming around.

• I was happier than they were because I was out of that crammed space in the egg!

• I wouldn’t stop moving around, so they couldn’t examine my heartbeat.

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