Discover KiGen koi food – a new science-backed range developed for serious koi keepers who want transparency, performance and value.

The KiGen koi food range has been created with a clear philosophy: premium koi nutrition should be built around ingredient quality, proven nutritional value and honest formulation. Developed from the perspective of a koi hobbyist, KiGen focuses on supporting health, growth, colour, body development and digestive quality without unnecessary confusion or over-complicated seasonal feeding routines.

With a range covering tosai development, balanced everyday feeding, low-protein year-round support, premium conditioning and advanced RG-92 enriched nutrition, KiGen gives koi keepers a clear choice depending on their goals, pond conditions and koi stage.

Why Choose KiGen Koi Food?

KiGen is positioned as a science-backed koi food range, with each formula developed around carefully selected proteins, carbohydrates, fats, vitamins, minerals and functional ingredients.

Key benefits across the KiGen range include:

Science-led formulation – developed with input from koi nutrition specialists and raw material experts
Ingredient transparency – clear explanations of protein sources, carbohydrate choices and functional additives
Support for growth, colour and health
Focus on digestibility and water quality
Premium formulations for different koi needs and feeding goals

KiGen’s approach is built around the idea of providing maximum value through ingredient quality, rather than relying on marketing claims alone.

Explore the KiGen Koi Food Range

KiGen Tosai

Refined nutrition for the healthy, harmonious development of tosai.

KiGen Tosai is a high-quality growth food developed specifically for young koi during their most important growth phase. With high protein and mineral levels, it supports rapid yet harmonious development, strong skeletal structure and balanced body shape.

Enriched with Enzym+, KiGen Tosai helps improve phosphorus absorption and supports healthy skeletal development, making it an ideal choice for koi keepers raising young koi correctly from an early stage. KiGen Tosai is a 3mm floating pellet available in 1.2kg and 5kg bags.

KiGen Tosai RG92

Enhanced tosai nutrition with RG-92 for growth, vitality, colour and future potential.

KiGen Tosai RG92 is a high-quality growth food developed for young koi from approximately 12cm upwards. It supports rapid but controlled growth, harmonious body shape, strong skeletal development, refined skin quality and improved vitality.

This enhanced formula includes RG-92, associated with improved vitality, feed efficiency and colour quality. Spirulina and astaxanthin help promote deep, natural colour development and bright skin quality, making Tosai RG92 especially suited to serious hobbyists and grow-on systems where future show potential is a key focus. KiGen Tosai RG92 is a 3mm floating pellet available in 1.2kg and 5kg bags.

KiGen Miori

Balanced nutrition to support growth, colour and health.

KiGen Miori is the accessible entry point into the KiGen range, offering a balanced premium formula at an attractive price point. It supports steady growth, body development, colour maintenance and everyday health. Miori is a 6mm floating pellet available in 1.2kg, 5kg and 10kg bags.

KiGen Manju

A low-protein, year-round feed enriched with additional micronutrients.

KiGen Manju is designed for year-round feeding, with particular value during colder periods such as winter and early spring. It features reduced protein levels and an increased vitamin and mineral premix to support condition, resilience and colour retention when koi are feeding less actively. Manju is a 6mm floating pellet available in 5kg and 10kg bags.

KiGen Kinsai

Floating or sinking, the ultimate choice for top-quality koi in peak condition.

KiGen Kinsai is a premium formula created for koi keepers who want strong body development, colour support and overall condition. It uses high-quality Arctic fishmeal, salmon oil, spirulina and natural colour-enhancing ingredients. Kinsai is available as a 6mm pellet in both floating and sinking versions, with 1.2kg, 5kg and 10kg bags available.

KiGen RG92 Special

Advanced nutrition, enriched with RG-92 Beppu hot spring algae.

KiGen RG92 Special builds on the Kinsai formula with the addition of RG-92, a specialist hot spring algae extract associated with improved vitality, nutrient utilisation and advanced koi development. RG92 Special is available as a 6mm pellet in both floating and sinking versions, with 1.2kg, 5kg and 10kg bags available.

Science-Backed Ingredient Choices

KiGen places strong emphasis on protein quality, digestibility and water impact. The brochure explains the use of high-quality fishmeal, including LT71 fishmeal in most formulas, chosen for its amino acid profile, digestibility and nutritional value. It also highlights millet as a preferred carbohydrate source due to its digestibility, low anti-nutritional factor load and potential water-quality benefits compared with some more common carbohydrate sources.

Which KiGen Food Should I Choose?

Goal	Recommended KiGen Food
Young koi / tosai growth	KiGen Tosai
Enhanced tosai growth, vitality and colour support	KiGen Tosai RG92
Balanced daily feeding	KiGen Miori
Lower-protein year-round feeding	KiGen Manju
Premium growth, colour and condition	KiGen Kinsai
Advanced nutrition with RG-92 algae	KiGen RG92 Special

Feeding Advice

Always adjust feeding according to:

Water temperature
Fish activity
Oxygen levels
Filtration capacity
Water quality readings

KiGen’s feeding guidance is intentionally conservative, with a strong focus on protecting water quality. Feeding should be reduced if ammonia or nitrite levels rise.