Study Tategoi Koi

Study Tategoi 2025!

We're excited to offer these tosai (koi less than 1-year old) from famous breeders for 2025. To make it easier for customers to compare, we have arranged the same variety together. This is the unique feature of this years Study Tategoi. This is a great way to affordably access many different varieties of koi all in one spot. We have multiple of the same variety like kohaku. Which breeder's Kohaku will you choose? Or perhaps, buying them all and comparing them yourself would be an exciting option! Normally full-grown koi sell for high prices, but with the Study Tategoi program (where koi are randomly selected for you) you can affordably get young koi and watch them grow and develop in your pond.

Great Pricing and Selections

This year we will be showcasing:

Over 3,000 individual koi
44 tosai varieties to choose from
24 excellent koi breeders

Prices currently range from $49–$149. All are at great prices and randomly selected. These koi will likely sell out fast; so select your favorites!

These koi are all pre-selected by Taro Kodama and are top-quality koi, so requesting to select individual koi is not an option.

🚚 Special Shipping Rates

Buy any Study Tategoi combination of:

1–4 koi to ship for only $99
5 or more koi to ship for FREE

Important: Available to ship after March 28th. Please give customer service 2 week in advance notice of your preferred shipping date. You can contact customer service at +1 (833) 546-5683 or info@kodamakoifarm.com

Browse Our Spring Study Tategoi Selection

What is the “Study Tategoi” program?

There are many ways to study koi. A lot of videos and articles are available on the Internet. You can have knowledge on the koi variety, breeder, how they may develop, etc.; but you can never get the experience online.

In order to fully understand koi, nothing is better than raising them yourself in your own pond. Only by raising these koi in your pond, can you see the color, quality, and how they will grow and develop their beauty. As a hobbyist, you want to get this experience with minimal investment.

Study Tategoi program offers this experience at an affordable price. At Study Tategoi program, we select the breeder of a group of fine quality tategoi (future koi). By offering them randomly picked, Kodama Koi Farm can keep the cost low for you; and you get to enjoy a high-demand bloodline with confidence in quality.

Mix and Match! Buy 5 or More and Receive Free Shipping On Your Order

View Otsuka Aka Matsuba

View Tani Beni Kumonryu

View Kanno Kin Showa

View Oyama Ginrin Kogane Ochiba

View Otsuka Chagoi

View Otsuka Beni Kikokuryu

View Marusaka Midorigoi

View Sakazume Ginrin Platinum

View Otsuka Ginrin Chagoi

View Kanno Kikusui

View Kawakami Ochiba

View Maruhiro Ginrin Soragoi

View Oyama Ginrin Chagoi

View Omosako Kujyaku

View Oyama Ginrin Ochibashigure

View Maruhiro Soragoi

Having A Hard Time Choosing Your Tosai? Look at The Koi Lineage For Help With Future Promise

In its first year - up to one year old; is referring to koi age. When you buy tosai koi, you are purchasing it due to the lineage and future potential the koi has to grow big. Selecting tosai can be difficult because the koi are at such a young age and not fully developed so it can be complicated to predict their final appearance.

Asagi & Shusui -

Asagi are characterized by 1) a blue or indigo body, and 2) red at the base of the pectoral fins. The red at the base of the pectoral fins is called Motoaka. Motoaka is an important factor in the beauty of both the Asagi and Shusui, as the both come from the same bloodlines.

Shusui was the first Doitsu variety of koi and are one of the only two blue koi! They are a Doitsu (scale-less) version of Asagi. Shusui was first bred in the early 1900's by Yoshigoro Akiyama mixing the Doitsugio, a German scale fish, and the Asagi.

Oya Koi Farm

Mr. Taro Kataoka

Taro Kataoka is one of the leading breeders in Japan. His Sanke has won many top awards at All Japan Nishikigoi Show.

We are very happy to share his tosai with you. Please experience and enjoy what his bloodline can do in your pond.

Kataoka believes HI's impact will increase as the Asagi ages, and you will see more of the red color on its fins.

All JAPAN KOI SHOW Botan prize 65 bu Asagi 3 years old 64.5cm

View Asagi

View Ginrin Asagi

Kawakami Koi Farm

Mr. Kenji Tani

Kawakami Koi Farm is known for their many varieties. This almost 100 year old koi farm has bred many quality Koi over 4 generations including Goshiki, Kumonryu, Beni kumonryu, Asagi, Shusui, Shiro Utsuri, and Kawarimono.

Shusui itself is a hard variety to come buy.

Mr. Kawakami is one of the few. We carefully examined the quality ones for the Study Tategoi program. Please enjoy the quality and the dynamic change of his Shusui.

View Shusui

Goshiki -

Goshiki was created in 1918 by breeding Asagi with Kohaku koi. translation of Goshiki is "five colors" and this koi truly shows a rainbow of colors. The black, blue, and grey colors appear in a reticulation, or a netted pattern, across the white and red and Kohaku like body. Unlike the Kohaku, you will find a very bright and bold Hi plate on this koi.

Kanno Koi Farm

Mr. Kazuhiro Hirasawa

Mr. Kazuhiro Hirasawa is one of the young leaders among breeders in Niigata.

Goshiki from Kanno Koi Farm are definitely of top quality and highly demanded.

The amazing beauty of Kanno's Goshiki that won the mature champion over Gosanke at the recent All Japan Koi Show is still refreshing!

Want to learn more about Kanno Koi Farm? Click here to view our KOI TALK with Kanno Koi Farm.

Mature Champion at All Japan Koi Show 2020

View Goshiki

Hiroi Koi Farm

Mr. Kazuyoshi Hiroi and Mr. Nobuaki Hiroi

Hiroi Koi Farm is one of the most established breeders with 80 + years of history in Niigata, Japan. Kazu and Nobu, the twin brothers says "they are very faccinated with the chance Koi can make.

Koi change its body shape, color and pattern as they grow. They have been famous for Doitsu Showa and Ginrin Goshiki.

What amazes us is that he always challenges new varieties and still produce high quality Koi. Producing high level Koi at one variety is hard enough.

View Goshiki

View Ginrin Goshiki

Hirenaga -

Hirenaga koi are the butterflies of the water, and are known for their graceful, flowing fins. The style of these butterfly type koi are very popular! Varieties include: Hirenaga Gin Matsuba, Hirenaga Kohaku, Hirenaga Kujyaku, and Hirenaga Showa

Suda Koi Farm

Mr. Kazutka Suda

View Hirenaga

Kohaku -

It has been said that koi keeping begins and ends with Kohaku. The history of Kohaku koi fish dates back to the 19th century in Japan when the first red and white carp were discovered and bred selectively to enhance their vivid coloration and distinctive patterns.

Dainichi Koi Farm

Mr. Shigeru Mano

In the Koi world, it is hard to find somebody who does not know the Dainichi name. It is synonym of champion quality Koi. As a matter of fact, he won the grand champion at 2020 All Japan Koi Show, the world's no. 1 Koi show.

Because of the quality and the highest demand for the limited supply, we feel very fortunate to be able to obtain Dainichi Tosai and share them with you.

Dainichi are always the first to get sold out. So please do not wait 'till the last minute. Want to learn more about Dainichi Koi Farm? Click here to view our KOI TALK with Dainichi Koi Farm

(All Japan Koi Show) Grand champion Kohaku

View Kohaku

Marudo Koi Farm

Mr. Hisashi Hirasawa

Being the former chairman of All Japan Nishikigoi P, A, he led breeders in Japan for a brighter future and higher quality Koi for people around the world.

Though he breeds many different varieties, his Kohaku and Taisho Sanke are especially popular. Recently he has won several grand champion titles with his Kohaku.

We are very happy to share his Kohaku and Taisho Sanke tosai with you. Please experience and enjoy what his bloodline can do in your pond.

Grand champion at Nogyosai 2018

View Kohaku

Torazo Urakawa Koi Farm

Tsuyoshi Kawakami

All Japan Koi Show Sakura prize

View Kohaku

View Ginrin Kohaku

Nogami Koi Farm

Grand Champion at Rinyukai Koi show 2010

View Kohaku

View Tancho Kohaku

Hiroi Koi Farm

Mr. Kazuyoshi Hiroi and Mr. Nobuaki Hiroi

Hiroi Koi Farm is one of the most established breeders with 80 + years of history in Niigata, Japan. Kazu and Nobu, the twin brothers says "they are very faccinated with the chance Koi can make. Koi change its body shape, color and pattern as they grow.

What amazes us is that he always challenges new varieites and still produce high quality Koi. Producing high level Koi at one variety is hard enough. The Hiroi twin brothers constantly add new varieties and seems easily breed such high quality ones.

One of varieites is Kohaku, that is what makes Hiroi Koi Farm a must-visit destination. Please get at lease one. Or more.

View Ginrin Kohaku

Sakai Company

Mr. Yoshimichi Sakai

Sakai Fish Farm is the world renown champion breeder.

There are 2 brothers who really built the foundation of the current farm. They are father and uncle of Mr.Kentaro Sakai, the current owner.

After his father passed away, his uncle, Yoshimichi, started his own Farm, which is the other Sakai, Sakai Company Ltd.

With the experience and the eyes made the world famous breeder, He and his son, Motoharu has been breeding beautiful Gosanke. I do not believe their Koi are not much available in the US yet.

We are very happy to be one of the first to introduce Kohaku from Sakai company.

Kokugyo (Best in Size) prize at the 52nd All Japan Koi Show

View Kohaku

Koromo -

Koromo are excellent koi and one to stand out in a pond. Kormo, meaning clothes or robe in Japanese, have a beautiful Hi (red) pattern of Kohaku on their pure white skin and have an indigo blue pattern on each scale of it's Hi pattern. It is ideal that indigo appears in crescent shapes regularly on the entire Hi pattern.

Sakazume Koi Farm

Mr. Shinsaku Sakazumi

Mr. Sakazume thinks Koi breeders must be an artist with breeding skills. Mr. Sakazume definitely fits into the definition of the breeder.

With his pride as an artist and the skill, he became a master of Aigoromo. Aigoromo is a variety that has indigo on its Kohaku pattern.

The contrast of its Ai (indigo) and the show white is beautiful.

As the production of Aigoromo itself is small and limited, I encourage you should not miss this great opportunity to get his world famous Aigoromo.

View Aigoromo

Otsuka Koi Farm

Mr. Yoshikazu Otsuka

Mr. Yoshikazu Otsuka always have wide range of unique yet high quality varieties in stock such as Goshiki, Goshiki Sanke, Ki Utsuri, Kage shiro Utsuri, Aka Matsuba, Shusui, etc..

In other words, no breeder in Japan breeds this unique variety. We are very fortunate to have them available for our study Tategoi program.

View Budogoromo

Matsukawabake -

Matsukawabake are a distinctive variety of koi, known for their dynamic and ever-changing "pine tree" pattern of black and white scales, which can shift with seasons and water temperature.

Taniguchi Koi Farm

Mr. Yoichi Taniguchi

We are lucky. They are the babies of the famous Ginrin Matsukawabake, Best in Variety Winner at the 55th All Japan Koi Show in 2025. Mr. Taniguchi, when I visited him last fall, proudly told me that this Koi spawned this year.

I told him I wanted the babies, but he was not sure how many he can spare as it was not a big spawning. I visited him again after I saw her history at the All Japan Koi Show and asked again.

We are very fortunate that he can spare one box of her babies with us!! Now they are available for Kodama customers.

Get the champion bloodline Ginrin Matsukawabake for your pond!

Best in Variety Winner at the 55th All Japan Koi show

View Ginrin Matsukawabake

Kaneko Koi Farm

Mr. Yasuaki Kaneko

Mr. Takaaki Kaneko founded Kaneko Koi Farm in 1961. Being one of the first to create and stabilize the Kujyaku variety, this is definitely the place to visit if you are looking for Kujyaku.

Yasuaki, his son, now takes over and expands the business. The farm's Shiro Utsuri and Matsukawabake are also excellent.

Specialty: Kujyaku, Shiro Utsuri, Matsukawabake, Ginrin Matsukawabake, Goshiki, Ochibashigure, Hikari Moyo

View Ginrin Matsukawabake

Ogon -

Since Mr. Sawata Aoki produced the first Ogon in 1947, a number of breeders have produced various Hikarimono based on the Ogon. Ogon, meaning Gold, belongs to the Hikari Muji group. Ogon is a solid color metallic koi, from silver to gold and shines beautifully in a pond.

Izumiya Koi Farm

Mr. Ryu Mano

Izumiya Koi Farm is one breeder with a long history in Niigata. It is well-known that Mr. Ichiro Mano, the founder of Izumiya and grandfather of Ryu, was the top Mekiki (keen eye evaluator) of Koi and has dealt with many high qualtity Koi back then. He is also well-known that Izumiya is synonymous with Ogon.

No breeder in Niigata can compete with Izumiya when it comes to Yamabuki Ogon. Their quality, body conformation, strong yellow shine, and Fukurin (net skin pattern)—every aspect of Izumiya Ogon is top quality.

We are very happy to share his Ogon tosai with you. Please experience and enjoy what his bloodline can do in your pond.

View Ogon

Maruhiro Koi Farm

Mr. Hironori Hirasawa

Being a brother of Marusei Koi Farm, it's no wonder that Mr. Hironori Hirasawa likes JUMBO.

He loves any Koi that grows big. When you go to his farm, you can feel his passion. His facility is always full of Koi, especially large ones regardless of the season.

If you can not find what you look for at Maruhiro Koi Farm, chances are that you will not find it any other places. He is one of buyers' first and last stops in Niigata.

If you want a Koi that is high quality and grows big, definitely get his Koi.

View Orange Ogon

View Ginrin Orange Ogon

Taisho Sanke -

Taisho Sanshoku, also called Taisho Sanke and Sanke, were developed from Kohaku about 80 years ago in 1918 in the era of Taisho. One day, while breeding Kohaku, a koi suddenly appeared with scattered and dirty Sumi over its body.

Marudo Koi Farm

Mr. Hisashi Hirasawa

Being the former chairman of All Japan Nishikigoi P, A, he led breeders in Japan for a brighter future and higher quality Koi for people around the world.

Though he breeds many different varieties, his Kohaku and Taisho Sanke are especially popular. Recently he has won several grand champion titles with his Kohaku.

We are very happy to share his Kohaku and Taisho Sanke tosai with you. Please experience and enjoy what his bloodline can do in your pond.

46th All Japan Rinyukai Superior Champion

View Taisho Sanke

Sakai Company

Mr. Yoshimichi Sakai

Sakai Fish Farm is the world renown champion breeder.

There are 2 brothers who really built the foundation of the current farm. They are father and uncle of Mr.Kentaro Sakai, the current owner.

After his father passed away, his uncle, Yoshimichi, started his own Farm, which is the other Sakai, Sakai Company Ltd.

With the experience and the eyes made the world famous breeder, He and his son, Motoharu has been breeding beautiful Gosanke. I do not believe their Koi are not much available in the US yet.

We are very happy to be one of the first to introduce Taisho Sanke from Sakai company.

Miyabi Prize at All Japan Koi Show

View Taisho Sanke

Hiroi Koi Farm

Mr. Kazuyoshi Hiroi and Mr. Nobuaki Hiroi

Hiroi Koi Farm is one of the most established breeders with 80 + years of history in Niigata, Japan. Kazu and Nobu, the twin brothers says "they are very fascinated with the chance Koi can make. Koi change its body shape, color and pattern as they grow.

What amazes us is that he always challenges new varieties and still produce high quality Koi. Producing high level Koi at one variety is hard enough. The Hiroi twin brothers constantly add new varieties and seems easily breed such high quality ones.

One of varieties is Doitsu Sanke, that is what makes Hiroi Koi Farm a must-visit destination. Please get at lease one. Or more.

View Doitsu Sanke

Showa -

Showa are one of the Gosanke or "Big 3" koi fish along with Taisho Sanke and Kohaku koi. Showa are beautiful koi, with colors of white, red, and black painted across their bodies the same way that a Japanese brush drawing suggests artistic interpretation without every stroke being complete. The beauty of these fish stir our emotions with it's exquisite combination of colors.

ISA Koi Farm

Mr. Mitsunori Isa

I must say that Isa Koi Farm and Dainichi are the two most popular breeders in Japan.

Isa's Showa has many features to enjoy, but my favorite quality is their strong bodies.

Even males can build such powerful shapes, just like the Kokugyo prize winner.

Want to learn more about Isa Koi Farm? Click here to view our KOI TALK with Isa Koi Farm.

46th All Japan Koi Show Superior Champion Isa Koi Farm

View Showa

Dainichi Koi Farm

Mr. Shigeru Mano

In the Koi world, it is hard to find somebody who does not know the Dainichi name. It is synonym of champion quality Koi. As a matter of fact, he won the grand champion at 2025 All Japan Koi show, the world's no. 1 Koi show.

Because of the quality and the highest demand for the limited supply, we feel very fortunate to be able to obtain Dainichi Tosai and share them with you.

Dainichi are always the first to get sold out. So please do not wait 'till the last minute. Want to learn more about Dainichi Koi Farm? Click here to view our KOI TALK with Dainichi Koi Farm

View Showa

Nogami Koi Farm

View Showa

Marushin Koi Farm

Grand champion at the 5th TNPA All Thailand Young Koi Show 2023

View Doitsu Showa

Hiroi Koi Farm

Mr. Kazuyoshi Hiroi and Mr. Nobuaki Hiroi

Hiroi Koi Farm is one of the most established breeders with 80 + years of history in Niigata, Japan. Kazu and Nobu, the twin brothers says "they are very fascinated with the chance Koi can make.

Koi change its body shape, color and pattern as they grow. They have been famous for Doitsu Showa and Ginrin Showa.

What amazes us is that he always challenges new varieties and still produce high quality Koi. Producing high level Koi at one variety is hard enough.

The Hiroi twin brothers constantly add new varieties and seems easily breed such high quality ones. One of varieites is Doitsu Showa, that is what makes Hiroi Koi Farm a must-visit destination. No other places offer this many and quality Doitsu Showa. Please get at lease one. Or more.

All Japan Young Koi Show Tsubaki Award

View Doitsu Showa

View Ginrin Showa

Utsurimono -

Utsurimono have a very fitting name as the base of their body is Sumi, or "black" and it means "reflection". There are three beautiful varieties of Utsurimono including of Hi (red), Shiro (white) or Ki (yellow). Having multiple different Utsurimono in your pond will steal the attention of onlookers.

Omosako Koi Farm

Mr. Takayoshi Omosako

There is no question that Omosako Koi Farm is the very best breeder of the Shiro Utsuri variety.

Taking the highest quality as granted, the body of his Shiro Utsuri is very hard to compete with. No Shiro Utsuri from other breeders can have the quality and the size in one. This is why his Shiro Utsuri surpasses everybody else's and always wins at the All Japan Koi Show.

It is very appreciated that Mr. Omosako consistently helps us obtain his valuable tosai and makes them available for you, our clients.

Want to learn more about Omosako Koi Farm? Click here to view our KOI TALK with Omosako Koi Farm.

ALL JAPAN KOI SHOW SAKURA AWARD 90bu

View Shiro Utsuri

View Ginrin Shiro Utsuri

Shinoda Koi Farm

Mr. Masanori Shinoda

When we talk about Shinoda Koi Farm, Hi Utsuri, Doitsu Showa and Ginrin Showa are the reason to visit.

His Hi Utsuri is especially second to none. Just like Omosako Shiro Utsuri, no breeder can touch Shinoda’s Hi Utsuri. His Hi Utsuri is a regular winner of Best in Variety award at All Japan Koi Show. As a matter of fact, he won the title for the last 3 consecutive years.

Want to learn more about Shinoda Koi Farm? Click here to view our KOI TALK with Shinoda Koi Farm.

Raised From Tosai At Kodama Koi Farm

View Hi Utsuri

Otsuka Koi Farm

Mr. Yoshikazu Otsuka

Mr. Yoshikazu Otsuka always have wide range of unique yet high quality varieties in stock such as Goshiki, Goshiki Sanke, Ki Utsuri, Kage shiro Utsuri, Aka Matsuba, Shusui, etc..

In other words, no breeder in Japan breeds this unique variety. We are very fortunate to have them available for our study Tategoi program.

View Ki Utsuri

Marusaka Koi Farm

Mr. Teruyuki Hiroi

This 70+ year Koi farm started 3 generations ago. Teruchiyo Hiroi, his grandfather, founded the farm.

View Kin Ki Utsuri

Taniguchi Koi Farm Golden Corn Available!

Mr. Yoichi Taniguchi

Mr. Taniguchi is a gifted breeder from south of Japan. We do grow out contests with his Koi every year. So I am sure many of you may be familiar with the quality of his Kohaku and Sanke. He always surprises us with the quality of his Koi. This year, he did it again. This time, it is not Gosanke, but Kawarimono or unique Koi.

It is called "GOLDEN CORN." Please see the transformation pictures of his golden corn. The transformation is nothing but breathtaking. Being in the industry, I have pretty good idea how Koi may turn out as it grows. But the change of this variety is simply unpredictable. Unexpected transformation and unexpected growth (they have DNA of over 40" chagoi) are the highlight of Golden Corn.

I do not believe too many golden corn are available in the US yet. I am very happy that we can offer this surprising beauty.

Golden Corn Examples

View Golden Corn

Konishi Karashi Are Back!

Koninshi Koi Farm

Mr. Joji Konishi

View Karashi

Tamasaba Goldfish Are Back For Study Tategoi!

Mr. Yasuaki Kaneko

Tamasaba goldfish are a rare ornamental goldfish from Japan and this batch is from Kaneko Koi Farm. They are hardy and can grow large for goldfish—up to 10 inches. Their bodies are round with arched backs and long, flowing tail fins; and they have solid red and white skin patterns.

As a part of his passion for goldfish, he wanted to breed goldfish that koi hobbyists can enjoy with Koi in Koi pond. That is how Tamasaba came to birth. They can live in the same pond as your koi! And they eat the same food, too. If you own koi already and want to add a new ornamental fish species easily, try a couple Tamasaba goldfishes.