Hatching medaka ricefish eggs

How to Hatch Medaka Ricefish Eggs (Step-by-Step Guide)

If you’ve recently bought or collected Medaka ricefish eggs, hatching them is easier than you might think. With the right setup and a bit of patience, you can successfully raise healthy fry at home.

This guide will walk you through the entire process step by step.

What You’ll Need

Before you start, make sure you have the following:

A small container or tank (1–5 litres is ideal)

Clean, dechlorinated water

An air stone (optional but helpful)

A pipette 

Meth blue (optional, to prevent fungus)

A stable temperature environment (24–26°C)

Step 1: Prepare the Hatching Container

Fill your container with clean,chlorinated water.

Keep the water shallow (around 5–10 cm deep) — this helps oxygen levels stay high.

Place the container somewhere with:

Stable temperature

Indirect light (avoid direct sunlight)

Step 2: Add the Eggs

Carefully transfer your eggs into the container using tweezers or a pipette.

Make sure:

Eggs are separated (not clumped together)

They are not sitting in debris

Healthy eggs are:

Clear or slightly golden

You may see tiny eyes developing over time

Step 3: Prevent Fungus (Important)

Fungus is the biggest risk when hatching eggs.

To prevent this:

Add a drop of methylene blue (optional)

Remove any white or fuzzy eggs immediately

👉 White eggs are infertile or infected and can spread fungus to healthy ones.

Step 4: Maintain Water Conditions

Keep conditions stable:

Temperature: 24–26°C (ideal around 25°C)

No strong water flow

Gentle aeration if possible

Do small water changes (10–20%) every few days using dechlorinated water.

Step 5: Watch for Development

Over the next few days, you’ll notice changes:

Eyes become visible

Embryo movement inside the egg

Hatching usually occurs within:

7–14 days, depending on temperature.