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Kojo II the Japanese Medaka

Kojo II the Japanese Medaka. By Jake Smith and Dane Roken. April 17. On the first day our medaka egg was at stage 29. It’s about 3 days and 2 hours old. This stage is the start of the internal ear development. Today we measured the heartbeat at 110 beats per minute

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Kojo II the Japanese Medaka

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  1. Kojo IIthe Japanese Medaka By Jake Smith and Dane Roken

  2. April 17 • On the first day our medaka egg was at stage 29. • It’s about 3 days and 2 hours old. • This stage is the start of the internal ear development. • Today we measured the heartbeat at 110 beats per minute • Yolk sac-encloses the yolk and gives the embryo nourishment from it 7 days until hatching

  3. April 20 • Our medaka is now in stage 35 (about 5 days 12 hours old). • In this stage, the visceral blood vessels form. • Filament-a long chain of cells. 4 days until hatching

  4. April 21 • Now Kojo is in the 36th stage of development (6 days old). • Today was the first day that red blood was visible in the egg. • We measured the heartbeat at about 126 beats per minute. • In this stage, the cadual fin reaches the otic vessel (ear) • Caudal fin-tail fin • Heart-pumps blood through the blood vessels 3 days until hatching

  5. April 22 • Now our medaka is in stage 37. • Its 7 days old. • This is the stage in which the pericardial cavity forms (where the heart is). • Somite-layers of the mesoderm that become muscles and vertebrate etc. • Brain-the main part of the central nervous system that controls all physical and mental actions 2 days until hatching

  6. April 23 • Now Kojo is in stage 38 (8 days old). • The spleen is developed in this stage. • We measured the heartbeat at 138 beats per minute. • Chorion-outermost layer of the embryo 1 day until hatching

  7. April 24 • Our Medaka is now in stage 39 at 9 days old. • It’s going to hatch at any moment. • To hatch the embryo dissolves the inner layers of the chorion and tear out of the last layer. • Spleen-organ that filters our worn out blood cells and has a reservoir of blood. Ready to hatch!!!

  8. April 27 • Kojo is has hatched and is about 12 days old and in the 42 or 2nd fry stage. • Intestine-digests and absorbs nutrients • Mouth-takes in food/begins digestion • Lateral fins-pair of fins that help the fish go up and down in the water

  9. Caring for the Medaka • You should always feed your medaka with commercially prepared food. Don’t overfeed! • Keep the fish away from doors and windows or other things that could cause sudden changes in temperature or light. • Make sure that the water quality is good (ph levels, ammonia etc.). • Remove waste and uneaten food very often with a net. • Watch out for bigger fish. Medaka are very small fish and could be eaten by larger ones. Photo by flickr user strollers

  10. Thanks For Watching Resources • <ref>http://www.ehow.com/how_2992_care-fish.html<ref/> • <ref>http://www.wikipedia.org/<ref/> • <ref>http://dictionary.reference.com/<ref/> • <ref>http://www.embl-heidelberg.de/mepd/medakaStages/MedakaDevStages.html<ref/> • <ref>http://biog-101-104.bio.cornell.edu/BioG101_104/tutorials/Medaka_stills.html<ref/> • All photos of Kojo by Jake Smith and Dane Roken

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