Daisy's Blue Ricefish Care Guide - Aquarium Setup, Diet & Breeding

Daisy's Blue Ricefish is a miniature species celebrated for its luminous blue body and vividly coloured eyes. Depending on lighting, the flanks can show a silvery, turquoise or electric blue sheen, while the fins often carry warm yellow, orange or reddish tones. Its small size makes the species particularly appealing for carefully planned nano and planted aquariums.

These ricefish are peaceful, active and constantly alert, spending much of their time in the upper and middle levels of the aquarium. They are social fish that look most confident in a group, where males may display to one another and court females without generally causing serious harm.

In the wild, Oryzias woworae inhabits clear, shallow waters with gentle movement and abundant marginal or aquatic vegetation. Its streamlined shape and upturned mouth reflect a lifestyle focused on picking small food items from the surface and among plants.

The species was described from Muna Island and has become popular among nano-fish enthusiasts because of its striking colour, manageable adult size and interesting breeding behaviour. It is also considered vulnerable in its native range, making responsible captive-bred stock especially desirable.

Daisy's Blue Ricefish are endemic to Muna Island in Southeast Sulawesi, Indonesia. They come from clear, shallow freshwater habitats in the Wallacean region of Asia, where they are associated with quiet streams and small waterways.

A group should be provided with an aquarium of at least 40 litres, with a footprint around 60 × 30 cm or larger preferred for active swimming and group behaviour. Use a gentle filter current, a secure cover and plenty of live plants, including fine-leaved species, floating plants and areas of open water. A dark fine-grained substrate, smooth hardscape and subdued lighting help the fish feel secure and make their blue colour stand out. Leave some open surface space while providing dense cover around the edges and rear of the aquarium.

Adults reach approximately 3.5 cm (1.4 inches) in total length. Females are usually slightly larger and deeper-bodied than males, while males tend to be slimmer and more colourful.

This species is an omnivore and should receive a varied diet of small flakes, fine granules and appropriately sized frozen or live foods. Daphnia, baby brine shrimp, cyclops, mosquito larvae and other tiny aquatic invertebrates help maintain colour and condition. Because of its small upturned mouth, food should be finely sized, and occasional surface foods are particularly well suited to its natural feeding habits.

Daisy's Blue Ricefish can share an aquarium with other peaceful, similarly sized species such as small rasboras, celestial pearl danios, ember tetras, pygmy corydoras and other non-aggressive ricefish. They are best kept away from large, boisterous or predatory fish, which may view them as prey or outcompete them for food. Avoid fin-nippers and highly aggressive species, and remember that mixed-species tanks may result in hybridisation between closely related ricefish.

Daisy's Blue Ricefish are straightforward egg-scatterers and will often breed in a mature, well-established aquarium. Spawning usually occurs among fine-leaved plants, moss or spawning mops, with the female carrying a cluster of adhesive eggs briefly before attaching them to vegetation. For better survival, move the eggs or spawning material to a separate container, where the fry hatch after roughly 10–14 days. The tiny young can be raised on infusoria or other appropriately fine foods before progressing to newly hatched brine shrimp and powdered fry food.

Males are generally more slender and display stronger yellow, orange or reddish tones in the fins, particularly when courting. Females are typically larger-bodied with a fuller abdomen, especially when carrying eggs, and their fin colours are usually more subdued.