Blonde Koi Guppy Care Guide - Setup, Diet & Breeding

Blonde Koi Guppies are an ornamental strain of the familiar guppy, prized for a pale blonde or golden base colour combined with koi-like patches of white, orange, red and black. Their precise pattern varies considerably, making each fish slightly different. Males are especially colourful and may have broad, flowing tails shaped by selective breeding.

These small livebearers are active, alert and constantly exploring the upper and middle levels of the aquarium. Males often display to females and to one another by spreading their fins and making quick, lively movements, although they are generally peaceful community fish.

In the wild, Poecilia reticulata inhabits shallow streams, pools, drainage channels and slow-moving margins with vegetation and varying water conditions. Wild guppies are more subdued in appearance than aquarium strains, but they retain the same hardy, adaptable nature.

Blonde Koi Guppies are livebearing fish, meaning females give birth to free-swimming young rather than laying eggs. Their colourful tails, approachable behaviour and easy breeding have made guppies one of the most popular freshwater aquarium fish worldwide.

Blonde Koi Guppies are a selectively bred colour variety of Poecilia reticulata, a species native to northern South America, including parts of Venezuela, Guyana, Suriname and Brazil. The Blonde Koi pattern and colouration were developed in the aquarium trade rather than occurring as a distinct wild population.

A group of Blonde Koi Guppies should have at least 40 litres, with a practical footprint of about 60 × 30 cm; a larger aquarium is preferable for mixed-sex groups because they reproduce rapidly. Use gentle to moderate filtration with a covered intake, open swimming space and plenty of live plants such as guppy grass, Java moss or water sprite. Fine gravel or sand works well, while floating plants and other cover help females and fry feel secure. A secure lid is recommended because guppies can jump.

Males usually reach about 3–4 cm (1.2–1.6 in), while females are larger at up to around 5–6 cm (2.0–2.4 in).

Offer Blonde Koi Guppies a varied omnivorous diet based on a quality small flake or micro-pellet food. Supplement this with frozen or live baby brine shrimp, daphnia and bloodworm, along with occasional spirulina-based foods or blanched vegetables. Feed small portions once or twice daily, taking care not to overfeed, and provide suitably fine food for fry.

Blonde Koi Guppies can be kept with other peaceful small community fish, including platies, mollies, small rasboras, peaceful tetras, white cloud mountain minnows, corydoras and small bristlenose plecos. Avoid fin-nipping species such as tiger barbs, larger or aggressive cichlids, and fish large enough to swallow them. Long-finned males may be harassed by persistent fin nippers, and mixed-sex groups will produce frequent fry.

Blonde Koi Guppies are prolific livebearers and readily breed in a mature aquarium. Maintain a ratio of around one male to two or three females to reduce persistent male attention. After internal fertilisation, the female gives birth to fully formed free-swimming fry after roughly 21–30 days. Dense plants or a dedicated breeding setup provide cover for the young, as adults may eat them. Feed the fry small powdered foods, crushed flakes or suitably sized live foods.

Males are smaller and more brightly patterned, with an elongated gonopodium and often a larger, more colourful tail. Females are deeper-bodied, generally less vivid, and have a visible gravid spot near the abdomen, especially when carrying fry.