Midorigoi are greenish or yellow-green koi. The name is commonly translated as "green carp," but an actual fish may look olive, yellow-green, or subtly green rather than bright emerald. Start with body color, then check the scale arrangement and finish in several views.
Use the photographs and comparison table below to distinguish Midorigoi from Kigoi and Chagoi. A photograph is a starting point: lighting, reflections, and camera white balance can make borderline colors difficult to identify.
Midorigoi, Kigoi, and Chagoi Photos
These examples come from the site's existing variety pages. They were photographed separately, so use them to compare visible features rather than as a calibrated color chart.
Midorigoi vs Kigoi vs Chagoi
| Variety | Main color clue | What to check next |
|---|---|---|
| Midorigoi | Greenish or yellow-green; some fish give an olive impression. | Compare several views. Describe the scales separately; Doitsu examples and scaled forms exist. |
| Kigoi | A predominantly yellow, non-metallic body. | Distinguish yellow skin from greenish color casts. For a metallic yellow fish, also compare Yamabuki Ogon. |
| Chagoi | Brown or tea-colored, including olive-brown shades. | Look at the overall brown tone and scale pattern. One green-looking photograph is not enough to relabel an olive Chagoi. |
If the yellow fish appears metallic, use the Yamabuki Ogon guide. Reflected light, sparkling scales, and metallic skin are different observations.
How to Identify a Midorigoi
- Look at the whole body: assess the main color rather than one brightly lit patch.
- Compare angles: request a top view and a short swimming video in representative light.
- Describe the scales: note reduced Doitsu scaling, larger scale rows, or fuller coverage. Use the scale-type guide.
- Record other marks: dark scales, spots, or patches should be visible in the seller's images rather than hidden by a flattering angle.
- Ask about the identification: have the breeder or seller explain the variety name for the individual fish when the color is ambiguous.
Next Day Koi's variety reference describes yellowish-green Midorigoi and notes both Doitsu and scaled forms. A variety label alone does not establish a fish's health, quality, or future appearance.
Will a Midorigoi Stay Green?
Do not buy on a promise that a particular shade will remain unchanged. Ask for dated photographs of the same fish and distinguish development over time from a change in lighting or camera settings. A blue bowl, reflected sky, and white balance can alter the color impression without demonstrating a biological change.
Choose a fish whose current appearance you enjoy. Ask which expectations are based on the individual and which are predictions. Sudden new lesions or tissue damage should be assessed as a health concern rather than dismissed as decorative color development.
Questions to Ask Before Buying Midorigoi
- Are these recent photographs of the exact fish for sale?
- Can I see a swimming video without strong color enhancement?
- How is the variety identified, and what scale type does this fish have?
- Has its color or marking pattern changed in earlier photographs?
- What are its measured size, known history, and any estimates about age or sex?
- What health, quarantine, transport, and sale information is available?
Compare the actual fish and total purchase terms rather than accepting a premium solely because it is called rare. Use grading and pricing questions and buying koi to evaluate the offer.
Does Midorigoi Need Different Care?
Plan the same essentials as for other koi: adult swimming space, suitable filtration and aeration, water testing, appropriate feeding, and quarantine for new fish. Avoid changing water chemistry simply to chase a greener appearance. Start with the beginner koi care guide if you are planning your first pond.