At Perfect Aquatics, we are always looking for products that genuinely bring something valuable to koi keepers. Every so often, a new range comes along that feels a little different — not just because of the branding or packaging, but because of the thought, detail and development behind it.
That is exactly why we are excited about the arrival of KiGen koi food.
KiGen is not positioned as “just another koi food”. The range has been developed around a clear philosophy: transparent, science-backed nutrition that supports koi health, growth, colour, digestion and water quality. The KiGen team has put a strong emphasis on ingredient quality, formulation detail and explaining exactly why each component has been chosen.
For koi keepers who want to understand what they are feeding — and why — KiGen is a very interesting addition to the market.
What Makes KiGen Koi Food Different?
The koi food market can sometimes feel overwhelming. There are foods for spring, summer, autumn, winter, growth, colour, health, digestion and almost every other feeding scenario imaginable.
KiGen takes a more considered approach.
Rather than creating endless variations, KiGen has developed a focused range of foods with clear purposes. Each product has been designed to support the key areas that matter most to koi keepers: healthy development, body condition, colour quality, digestion, immune support and water quality.
The idea behind the brand is simple: koi food should be effective, honest, and built around proven nutritional value.
KiGen’s own messaging sums this up well: Backed by Science. Built for KOI.
Developed with a Scientific Approach
One of the most impressive aspects of KiGen is the level of transparency around its formulation. The brand openly discusses the choices made around proteins, carbohydrates, fats, vitamins, minerals and functional ingredients.
According to the KiGen brochure, the range was developed with input from nutritionists, raw material specialists and other experts, with each ingredient selected based on proven performance and added value.
For serious koi keepers, this matters.
A good koi food is not just about having a high protein percentage on the bag. The quality, digestibility and usability of that protein is just as important. The same applies to the carbohydrate source, fat profile, mineral balance and additives used within the feed.
KiGen’s approach looks beyond simple headline figures and focuses on how the food is actually used by the koi.
The Importance of High-Quality Protein
Protein is one of the most important parts of any koi food. It supports growth, muscle development, recovery, condition and overall vitality.
KiGen places a major focus on the quality of its protein sources. Across most of the premium range, KiGen uses LT71 fishmeal as the primary protein source. LT stands for low temperature, meaning the fishmeal is processed more gently to help preserve valuable nutrients and amino acids.
This is important because koi need usable nutrition, not just impressive numbers on a label.
High-quality fishmeal is known for:
- Excellent digestibility
- A strong amino acid profile
- Natural attraction for koi
- Efficient nutrient absorption
- Supporting growth, condition and vitality
The practical benefit for koi keepers is that better digestibility can help koi make more effective use of the food they consume. This may support better growth and condition while helping to reduce unnecessary waste entering the pond system.
Why Digestibility Matters for Water Quality
Every koi keeper knows that food quality and water quality are closely connected.
When koi food is poorly digested or contains lower-quality ingredients, more waste can be produced. This can place extra strain on the filter system and may contribute to poorer water clarity or higher nutrient load.
KiGen highlights the importance of digestibility throughout its formulation. The use of high-quality protein sources, carefully selected carbohydrates and a conservative feeding approach is designed to support efficient nutrient use and reduce unnecessary waste.
Of course, all koi food still needs to be fed responsibly. More food always means more waste and more pressure on the filter, regardless of brand. But a more digestible food can help koi use more of what they are given.
That is a big reason why the KiGen range is likely to appeal to experienced koi keepers who care about both fish condition and pond stability.
Millet: A More Considered Carbohydrate Source
Protein usually gets most of the attention in koi food, but carbohydrates also play an important role.
Many koi foods use more common carbohydrate sources such as wheat, corn or rice. KiGen has chosen to use millet as its main carbohydrate source across the range. The brochure explains that millet was selected because of its digestibility, low anti-nutritional factor load, gluten-free composition, stable energy release and potential benefits for faeces quality and water clarity.
This is a really interesting point of difference.
Millet is not the cheapest or most obvious choice, but KiGen argues that it offers technical advantages when used properly in high-quality koi food. It contributes to stable pellet structure, efficient starch utilisation and potentially lower nutritional “noise” compared with some less refined carbohydrate choices.
In simple terms, KiGen is not only thinking about what goes into the koi. It is also considering how the food is digested, how energy is released, and how the remaining waste affects the pond.
The KiGen Koi Food Range Explained
The KiGen range currently includes five main varieties, each with a clear role.
KiGen Tosai
Best for: young koi, controlled growth and healthy development
KiGen Tosai has been specially developed for young koi. It is designed to support rapid but harmonious growth, with a focus on body shape, skeletal development, skin quality, colour and vitality.
This is not simply a high-protein food designed to push growth at any cost. The formula has been created to support balanced development, with attention given to bone structure, metabolism, digestion and immune support.
KiGen Tosai is a strong choice for hobbyists growing on young koi and wanting to support their development properly from an early stage.
Key benefits:
- Supports healthy growth in young koi
- Helps encourage balanced body development
- Supports skeletal strength
- Supports skin quality and vitality
- Designed for controlled tosai development
KiGen Tosai RG92
Best for: young koi, advanced tosai development and RG-92-enriched feeding
KiGen Tosai RG92 is a separate product from KiGen Tosai and is designed for koi keepers who want an advanced feeding option for young koi.
It takes the tosai growth concept and combines it with RG-92, giving hobbyists an enhanced formula for young koi development. This makes it particularly interesting for serious koi keepers growing on high-quality tosai and looking to support growth, vitality, digestion, body development and skin quality.
If KiGen Tosai is the premium growth food for young koi, KiGen Tosai RG92 is the advanced step-up option within the tosai category.
Key benefits:
- Advanced food for young koi
- Enriched with RG-92
- Supports controlled growth and body development
- Helps support vitality and condition
- Ideal for serious tosai grow-on projects
KiGen Miori
Best for: everyday feeding, balanced nutrition and strong value
KiGen Miori is the more accessible entry point into the KiGen range, but it is still built around a premium feeding philosophy.
The formula uses a combination of fishmeal and poultry meal to provide a credible protein source while keeping the food more affordable. KiGen describes Miori as a reliable and well-balanced food that clearly exceeds the standard of its price category.
This makes Miori a very appealing option for koi keepers who want a good-quality daily food without moving into the very highest price point.
Key benefits:
- Balanced daily nutrition
- Supports steady growth
- Helps maintain beni and shiroji
- Good health support
- Excellent value within the KiGen range
KiGen Manju
Best for: colder water periods, lower protein feeding and year-round condition
KiGen Manju is a low-protein, highly digestible food designed to support koi during periods when feeding needs to be more controlled.
Although it can be fed throughout the year, Manju is especially useful during winter and early spring, when koi metabolism slows and water temperatures reduce feeding opportunities. The formula has a reduced protein content and an increased vitamin and mineral premix, helping to support condition, vitality and immune function during more vulnerable periods.
Importantly, Manju is not simply a traditional wheatgerm winter food. It is a more considered formula designed to support koi health and condition while placing less strain on digestion.
Key benefits:
- Lower protein formula
- Highly digestible
- Supports immunity and vitality
- Increased vitamin and mineral premix
- Helps maintain colour during colder, lower-light periods
KiGen Kinsai
Best for: premium feeding, growth, colour and top-quality koi
KiGen Kinsai is one of the flagship foods in the range. It is designed for koi keepers who want a premium food to support growth, colour, body development and overall health.
The formula uses high-quality Arctic LT fishmeal, salmon oil, spirulina and natural colour-supporting ingredients. It is designed to help support deep colour, bright skin quality, strong vitality and efficient nutrient use.
Kinsai is available in both floating and sinking options, making it a flexible choice depending on your pond, fish behaviour and feeding preference.
Key benefits:
- Premium growth and colour support
- Supports beni and shiroji
- Helps promote strong body condition
- Designed for high-quality koi
- Available floating or sinking
KiGen RG92 Special
Best for: advanced feeding, high-end koi and RG-92 algae benefits
KiGen RG92 Special is the most advanced food in the range.
It is based on the Kinsai formula but enriched with RG-92 Beppu hot spring algae. According to the KiGen brochure, RG-92 is a natural extract derived from microalgae found in hot springs and is used in RG92 Special as a fully integrated ingredient within the feed pellet.
KiGen explains that RG-92 is associated with support for gut function, nutrient absorption, vitality, resistance and feed efficiency. The brochure also notes that RG92 Koi Farm and other breeders have used RG-92 as an additive to koi food, with KiGen introducing RG92 Special as its top-level food enriched with this ingredient.
For koi keepers looking for the most advanced formulation in the KiGen range, RG92 Special is the standout choice.
Key benefits:
- Advanced premium koi nutrition
- Enriched with RG-92 Beppu hot spring algae
- Supports growth, vitality and resistance
- Helps support beni and shiroji
- Available floating or sinking
Which KiGen Koi Food Should You Choose?
Choosing the right KiGen food depends on your koi, your pond, the season and your goals.
Here is a simple guide:
For young koi and tosai:
Choose KiGen Tosai RG92.
For everyday premium feeding at a more accessible price:
Choose KiGen Miori.
For colder water periods or lower protein feeding:
Choose KiGen Manju.
For serious koi keepers wanting premium growth, colour and condition:
Choose KiGen Kinsai.
For the most advanced food in the range with RG-92 algae:
Choose KiGen RG92 Special.
As always, feeding should be adjusted to water temperature, oxygen levels, filtration capacity and water quality. KiGen’s own feeding tables are intentionally conservative, with a clear focus on protecting pond stability as well as supporting koi condition.
Why We Are Excited to Stock KiGen at Perfect Aquatics
At Perfect Aquatics, we work with koi keepers at all levels — from hobbyists buying their first pond fish to serious enthusiasts investing in hand-picked Japanese koi.
That means we are always interested in products that offer more than clever marketing.
KiGen stands out because it gives koi keepers a clear explanation of what is in the food, why it has been included, and how it is intended to benefit the fish. The range feels modern, thoughtful and honest, with a strong focus on ingredient quality, digestibility, colour support, body development and water quality.
For us, this makes KiGen an exciting addition to our koi food range.
Whether you are growing on tosai, maintaining koi condition through the seasons, or looking for a premium food for high-quality Japanese koi, there is a KiGen option designed for that purpose.
Shop the KiGen Koi Food Range
The full KiGen koi food range is now available from Perfect Aquatics.
Explore the range online and find the right food for your koi, including Tosai, Tosai RG92, Miori, Manju, Kinsai and RG92 Special.
Shop KiGen koi food at Perfect Aquatics today and feed the difference.