KiGen Koi Food

Which KiGen food should you choose?

Protein figures describe the finished food. Floating and sinking Kinsai and RG-92 Special have different recipes, so choose the format as well as the bag weight. Listed sizes describe the range; check the product’s current availability before ordering.

For young koi: Tosai or Tosai RG-92

KiGen Tosai combines a 3 mm floating pellet with 45% protein for young-koi development. It is designed for young fish from approximately 12 cm, although comfortable pellet handling matters more than length alone. The floating format helps you watch appetite and see whether smaller fish are getting their share.

KiGen Tosai RG-92 is the small-pellet option with added RG-92 algae extract. It also contains 45% protein and comes in 1.2 kg and 5 kg bags. Choose between these two on the basis of the recipe you want; adding RG-92 does not remove the need for careful rationing, good oxygen levels and established filtration.

For regular feeding: Miori

KiGen Miori is a practical starting point for active koi that comfortably take a 6 mm pellet. Its 38% protein recipe combines fishmeal and poultry meal, with wheat feed meal, sorghum, triticale and wheatgerm among its declared cereal ingredients. It is intended for balanced growth, colour and everyday condition through the normal feeding season.

Miori is floating only. That suits keepers who want to observe feeding at the surface and remove any uneaten pellets. Its choice of 1.2 kg, 5 kg and 10 kg bags lets you match the quantity to a small collection or a pond with a higher regular consumption.

For maintenance and cooler active periods: Manju

KiGen Manju has 28% protein and an enriched micronutrient premix. It puts the emphasis on maintaining condition when a growth-focused ration is less appropriate, including cooler periods when koi are still actively feeding. The 6 mm floating pellet is available in 5 kg and 10 kg bags.

Manju is described as a year-round maintenance food, rather than simply a wheatgerm winter food. Year-round suitability does not mean feeding regardless of water temperature: its published guide says not to feed below 8°C. Appetite, temperature and water quality still determine whether and how much to offer.

For a premium 6 mm diet: Kinsai or RG-92 Special

KiGen Kinsai uses LT71 fishmeal and shrimp meal in a recipe developed for growth, body shape and colour. You can choose floating or sinking pellets, with 38% protein in the floating food and 40% in the sinking food. Both formats come in 1.2 kg, 5 kg and 10 kg bags.

KiGen RG-92 Special adds RG-92 algae extract to the premium Kinsai-based approach. It has the same choice of pellet formats and bag weights, with the same 38% floating and 40% sinking protein levels. You may see the name Marujyu Special in the January 2026 KiGen brochure; our product is listed under the current RG-92 Special name.

What goes into KiGen koi food?

The range brings together protein ingredients, energy sources and vitamin and mineral premixes, with different balances for different feeding needs. Several recipes use low-temperature fishmeal, identified as LT71. That is an ingredient grade, not a claim that the finished pellet contains 71% protein. Miori uses a different fishmeal-and-poultry blend, while Manju has a deliberately lower finished-feed protein level.

The published bag labels list sorghum alongside other recipe-specific cereal ingredients. These provide energy and help form the pellets. Spirulina and declared canthaxanthin are among the ingredients and additives used in the range’s colour-focused formulations. The individual product pages show the manufacturer’s label composition, protein, fat, fibre, ash and additive declarations, with separate figures for floating and sinking recipes. These label details take priority over the brochure’s use of millet; check the pack supplied for its applicable declaration and feeding instructions.

RG-92 is an extract derived from microalgae associated with Japanese hot springs. It is included during manufacture in Tosai RG-92 and RG-92 Special. It is not a live probiotic and should not be treated as a medicine or a replacement for sound pond management.

Floating or sinking pellets?

Floating pellets make feeding easy to observe. You can see which fish come up, whether they take the pellet cleanly and when interest starts to fall. That is useful for adjusting portions and noticing changes in individual behaviour. Tosai, Tosai RG-92, Miori and Manju are floating foods; Kinsai and RG-92 Special offer either format.

Sinking pellets give you another way to feed fish that prefer to take food below the surface. Introduce them in small amounts where you can follow their path and see the koi eating. Food that drops out of sight can still be left uneaten, so a sinking pellet is not a reason to increase the ration. Choose the format that lets you feed your collection confidently and monitor waste.

Feeding KiGen through the seasons

Base feeding on measured water temperature and the fish’s appetite, rather than the month alone. A heated pond and an unheated garden pond can need quite different routines on the same day. The individual KiGen product pages include the relevant temperature guidance where available; do not apply one formula’s ration table to every other food.

Calculate a daily allowance for the fish’s estimated combined body weight, then divide it into manageable feeds. A percentage in a feeding table is the total for the day, not the amount for each feeding. For example, 0.3% of an estimated 10 kg of koi is 30 g of food for the whole day. That calculation explains the units; it does not prescribe the correct ration for your pond.

Start conservatively, watch the fish eating and reduce the amount if pellets remain. Increase feeding only when appetite, oxygen supply and established filtration can support it. High water temperatures do not justify unlimited feeding: the published tables also reduce the ration in very warm water. Monitor ammonia and nitrite as feeding changes, especially after a cold period or work on the filter.

Changing food and choosing a bag size

Introduce a new food progressively so you can observe acceptance and adjust quantities. In a mixed-size collection, check that the smallest fish can handle the pellet and that larger koi are not taking every portion. A 3 mm food can be the more manageable choice for young fish even when the larger koi readily take 6 mm pellets.

Choose a bag you can use within the pack’s storage and best-before guidance. Larger bags suit higher consumption; a smaller bag can make more sense when trying a recipe or feeding a modest collection. Store food cool and dry, keep the bag closed and use a clean, dry scoop.

For alternatives across other brands and feeding needs, browse our wider koi food range.