Ivy and Amy

"SQUIRT"



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Day 1 (May 20)
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We thought our Japanese Medaka Egg looked like it was at stage 18, which is 26 hours old. The anterior end of the keel has broadened into two divisions of the rudimentary brain. The embryonic axis is approximately 1 mm long, and the mesoderm is lateral. The blastopore is just a small opening.

Day 2 (May 21)
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We still believe that Squirt is about 50 hours old now. We are begining to see the heart beat. The head and tail have started to lift off the yolk sac.

Day 3 (May 22)
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Today, we seen and counted the heartbeat of our Japanese Medaka Egg. It had 57 heartbeats per minute.

Day 4 (May 23)
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Today we noticed 101 heartbeats a minute. As it gets older, the heartbeats increase as it makes its way to adulthood.

Day 8 (May 27)
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There were 128 heartbeats a minute today. It also is starting the move around and becoming more noticeable.

Day 9 (May 28)
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We noticed 135 heartbeats a minute.

Day 10 (May 29)
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Today, when we counted the heartbeats Squirt moved around alot. The heartbeats remained at 135 beats per minute. We think it is on Stage 29 which is 74 hours because of the heartbeats and picture. However, the hours doesn't allow it to be on just Stage 29.

Day 11 (May 30)
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Today Ivy and I noticed 150 heartbeats a minute. The heart was more visible today and so was everything else. The spleen is now visible.

Day 12 (June 2)
Over the weekend, our little SQUIRT hatched.!.
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Isn't he a cutie??

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Medaka Facts
Medaka Fish are very tiny fish, similar to the size of a guppie.
The Japanese Medaka scientific name is, Oryzias latipes.
The eggs are transparent, and they can be viewed under a microscope.
Out of all the egg-laying aquarium fish, Medakas are the most freely breed.
In just one breeding season, a female can produce up to 3,000 eggs.
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Interesting Site
http://www.woodrow.org/teachers/bi/1997/medaka/