Medaka Outdoor Breeding and Care Guide | Enjoying Medaka on Your Balcony or in Your Garden

Medaka are among the ornamental fish most well-adapted to Japan's climate. They can be easily started in small spaces on balconies or in gardens, and medaka bathed in abundant sunlight display vibrant body colors. The diversity of improved varieties continues to expand year after year, offering endless ways to enjoy them. This article provides an easy-to-understand explanation for beginners, from choosing containers for outdoor breeding to reproduction and fry management, to care tips throughout the four seasons.

Choosing Containers Suitable for Outdoor Breeding

In outdoor breeding, the container's material, size, and color greatly affect water quality and color development. Let's look at the main options.

Plastic Tubs / Agricultural Troughs

These flat plastic containers are distributed for agricultural and industrial use and are the standard of standards in medaka breeding. The 40L, 60L, and 80L sizes are popular, and the greater the water volume, the more gradual the water temperature changes, making management easier. Black agricultural troughs are particularly popular because medaka relax easily and their body colors stand out beautifully. They have high durability and can be used for multiple years, which is another advantage.

Water Lily Pots (Ceramic or Plastic)

Water lily pots, which are perfect for Japanese gardens, add visual beauty to the pleasure of breeding. Ceramic pots have depth and maintain stable water temperatures, but they are heavy and difficult to move. Plastic water lily pots are lightweight and easy to handle, with a variety of designs. When combined with aquatic plants and floating plants as a biotope, they create a beautiful space that captures natural scenery.

Styrofoam Boxes

Styrofoam boxes, which can be obtained free or cheaply at supermarkets and fish shops, are excellent containers with high insulation and protection against sudden water temperature changes. They have a moderating effect on both high summer water temperatures and winter freezing, and are particularly suitable for fry rearing. Although the appearance is plain, the functionality is assured. You can also use the lid to create shade.

If you choose the container size with "ample water volume" in mind, you will have fewer failures. Aim for a minimum of 1 liter per medaka and secure a generous water volume.