How to hatch Medaka Rice Fish Eggs from the Mail

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Welcome to NoobAquatics, today we are hatching Medaka Rice Fish eggs that we received in the mail directly from Japan. These eggs are from a rare color variant called Himitu heiki (aka Secret Weapon) Japanese Medaka Rice Fish (Oryzias Latipes). We ordered a total of 30 eggs and received 34 eggs and an already hatched fry. Out of the 34 eggs, 2 were very white and never hatched from the beginning. For the remaining 32 eggs, we were able to hatch a total of 28 Rice Fish. One of these babies were a little deformed, and I am pretty sure that it will not survive. So, our success rate at hatching these eggs is 27 out of 32. This is an 84% hatch rate, which is awesome.

The supplies you will need to be successful in hatching these beautiful eggs:

• Medaka Eggs
• ½ gallon container that is completely disinfected (we use a clear Tupperware container that has marks at 16 oz. and 32 oz.)
• Clean water, preferably water that is already mineralized (our water is remineralized out of the tap using a special water filter that includes Calcium, Magnesium, etc., with a clean TDS of 120) and stored at room temperature (between 70 - 75 F)
• Clean and disinfected Pipettes
• 2-3 feet of standard airline tubing for siphoning water out of the containers
• Sink or container to catch the dirty water
• Small container or lid for acclimating the eggs/fry
• No air needed in the hatching process
• Methylene Blue (we use Kordon Methylene Blue)
• Drip acclimator of some kind (we have a video on how to make a DIY drip acclimator)
• Thermometer (we use a regular, non-digital thermometer)
• Toothpicks (these are used to add in the Methylene Blue, easiest method)

The container will need to be stored in a location that is warm, around 75 degrees F or 23.8 Celsius, and has light that can hit the container for at least 10 hours a day. We have found that the eggs for some reason were only hatching when the lights were on, which is very interesting. Follow along on the video as we walk you through the entire process of hatching these eggs to the free-swimming stage.

Medaka Rice Fish hatch at a 250-degree Celsius total, so if your water temperature is at 23 degrees C, then you take 250 divided by 23 and that number is the total number of days your eggs will take to hatch. Yes, if the water is warmer, they will hatch quicker, but this can also shorten the lifespan of your fish. So, keep you water between 70 - 75 degrees F, or 21 - 24 C, for the best hatching time that is healthier for your new Medaka eggs.