Name: 10cm Japanese Baby Tosai Koi Mix – Maruhiro
Brand: Byer Koi Farm
Price: 60.0 GBP
Availability: InStock

10cm Japanese Baby Tosai Koi Mix – Maruhiro

Byer Koi Farm

£60.00

Tax included.

These Japanese Baby Tosai Koi (approximately 10cm) have been sourced from Maruhiro Koi Farm in Niigata, Japan, one of the heartlands of Japanese koi production.

At this size they are among the smallest koi we offer, making them a popular choice for hobbyists who enjoy introducing young koi to their ponds and watching their colours and patterns develop as they grow.

These baby tosai are smaller than our standard 15–18cm Japanese tosai mixes, but have completed the same thorough quarantine process and still offer a varied selection of colours and patterns from Maruhiro’s breeding programme.

Each koi measures approximately 10cm. Some are a little larger, some a little smaller.

From Japan to Byer Koi Farm

Many of these koi were introduced in our recent blog about Japanese Tosai, Butterfly Koi & Baby Koi arriving for Spring 2026, where you can see the fish arriving and moving through our systems.

Selecting your koi

Online orders are selected personally by Adam or Amanda, using our experience to choose a balanced and attractive mix from the tank.

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Koi delivery is via a specialist overnight fish courier service that we have been using successfully for many years.

Local pickup is available; choose that option in the checkout process, then once purchased, contact us to arrange collection.

For dry goods, the vast majority of items ordered before midday are shipped the same day, on an overnight service.

Byer koi farm

UK breeder of champions

Pushing the boundaries is in our DNA, and now with Byer Koi Farm being a leading UK koi farm consistently producing champion winning koi, we are elevating the quality and perception of UK bred koi and contributing to the success of UK aquaculture

everyone contributes

Byer Koi Farm is a family business

Everyone lends a hand in peak season. Harvesting fry ponds and manning our stand at koi shows are just a couple of areas where the kids muck in.

farming koi the japanese way

Selection, selection, selection! Only a tiny proportion of each spawning makes the highest quality koi.

The year's we've spent optimising our breeding lines delivers better quality koi for our customers.

Testimonials

★★★★★
From Google Business Reviews: Absolutely exceptional. Wonderful, extremely health fish clearly very well reared and looked after. A credit to the breeder.
James Rogers
Watford, UK

★★★★★
From Google Business Reviews: Highly recommend the Koi Fry from this farm, the customer service, colour and quality of the fry was fantastic. I look forward to getting some older fish from the family run farm.
Keegan Rees
UK

★★★★★
From Google Business Reviews: Family run business with high quality koi. Well worth a visit
CATANDEYE KOI (YouTuber)
UK

★★★★★
From Facebook: Bought some fantastic koi which arrived this week.Great service and great communication start to finish. Will be back to buy some more
Ben Mort
UK

★★★★★
From Facebook: Great place, friendly team and absolutely great koi.
Darren Walker
UK

★★★★★
From Facebook: Unbelivable service from Adam and Amanda. Would recommend to anyone looking for quality koi.
Alex Dawson
UK

10cm Japanese Baby Tosai Koi Mix – Maruhiro

From Japan to Byer Koi Farm

Selecting your koi

Testimonials

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