Approx Max Length : 4cm

Glitter Medaka Ricefish - Oryzias latipes var. Glitter Fish Profile & Care Guide

The Glitter Medaka Ricefish (Oryzias latipes var. Glitter) is a peaceful, active and beautifully reflective variety of the Japanese Ricefish. Its pale, pearly-white body develops a striking metallic sheen that can appear silver or subtly blue depending on the lighting and viewing angle. Medaka are lively fish that spend much of their time exploring the upper and middle areas of the aquarium. Despite their active nature, they have a generally peaceful temperament and are well suited to temperate aquariums, planted tanks and suitably protected outdoor ponds.

Medaka are naturally social and show a strong tendency to form loose groups or shoals. In a spacious aquarium or pond, they may gather together for periods before separating into smaller groups, pairs or individual fish. This is completely normal behaviour. They are best kept with other peaceful species that enjoy similar temperatures and water conditions. Suitable companions can include other small temperate fish and some peaceful bottom-dwelling species, provided their requirements are compatible. Snails are generally excellent tank mates, while adult freshwater shrimp can also be kept with medaka. Very small shrimplets, however, may occasionally be eaten.

Aggressive, highly territorial or substantially larger fish should be avoided. It is also worth remembering that most community fish will readily eat medaka eggs or newly hatched fry if given the opportunity. Glitter Medaka Ricefish are remarkably hardy and can tolerate a broader range of conditions than many commonly kept aquarium fish. However, hardy does not mean that poor water quality is harmless. They should still be provided with clean, stable water and appropriate filtration or regular maintenance.

Medaka are particularly well suited to unheated and temperate aquariums. They can also overwinter outdoors in suitable ponds or containers where the climate allows, provided sufficient unfrozen water remains beneath any surface ice. They cannot survive being frozen solid, so shallow containers require extra care during severe winter weather. A planted aquarium provides an excellent environment for medaka. Fine-leaved and floating plants give the fish cover, provide places for females to deposit eggs and create sheltered areas for newly hatched fry.

Driftwood and other natural decorations can also be used, although plenty of open swimming space should be retained near the surface. Medaka do not require unusually intense aquarium lighting. A normal day-and-night lighting cycle is suitable, while natural daylight and longer photoperiods can help stimulate seasonal breeding behaviour. Their reflective scales are particularly attractive when viewed from above, which is one reason medaka are traditionally popular in outdoor bowls and ponds.

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Sexual Dimorphism

Adult Glitter Medaka Ricefish are relatively easy to sex once their secondary sexual characteristics have developed. Males tend to have a slimmer body shape and noticeably larger anal and dorsal fins. The male anal fin is typically longer and more angular or parallelogram-shaped, while the dorsal fin develops a characteristic notch or separation towards its rear. Females generally have a fuller, rounder abdomen, particularly when carrying developing eggs.

Their anal fin is shorter and more rounded or triangular, while the dorsal fin lacks the pronounced notch normally seen in mature males. Colour intensity can sometimes differ between the sexes in ornamental strains, but fin shape and body form are generally more reliable indicators than colour alone. During the breeding season, females are particularly easy to identify when they are seen swimming with a cluster of eggs suspended beneath the abdomen shortly after spawning.

Quick Facts

Scientific Name	Oryzias latipes var. Glitter
Year Described	1846
Other Names	Tri-colour Lane
Kingdom	Animalia
Classification	Actinopterygii
Order	Beloniformes
Family	Adrianichthyidae
Genus	Oryzias
Origins	Japan
Approx Max Size	4 cm
Temperament	Peaceful
Aquarium Level	Middle - Top
Difficulty	Beginner - Intermediate
Shoaling	Yes
Best kept as	Groups 6+
Diet & Feeding	Omnivore
Reproduction	Egg Depositor
Average Lifespan	Up to 3 Years

Water Parameters

Water Type	Freshwater
pH	6.5 - 8.0
GH	3 - 14
KH	2 - 8
TDS	100 - 300

Ideal Temperature Range
℉	64 - 75
℃	18 - 24

Natural Habitat

The Glitter Medaka Ricefish is native to Japan. Historically, the name Oryzias latipes was applied more broadly to medaka populations across East Asia, but modern taxonomic work has separated several of these populations into distinct species. In the wild, medaka inhabit a variety of shallow and slow-moving environments, including ponds, marshes, irrigation channels, rice paddies and gently flowing lowland waters. Some populations are also capable of living in mildly brackish environments.

Their association with rice paddies is responsible for the familiar name “Ricefish”. These shallow environments can contain abundant vegetation, microorganisms, zooplankton and insect life, providing both food and shelter. Medaka are highly adaptable, which is one reason they have become so successful as both ornamental fish and an important scientific model species. However, their tolerance of changing environmental conditions should not be mistaken for a preference for dirty or stagnant water.

Breeding

Glitter Medaka Ricefish are relatively straightforward to breed when healthy adults are provided with suitable conditions. In outdoor setups, spawning activity is generally greatest during the warmer months as water temperatures rise and daylight hours increase. In a controlled indoor aquarium with suitable temperature, nutrition and lighting, healthy medaka can reproduce for extended periods and may spawn almost every day. A separate breeding aquarium is not essential, but it greatly increases the number of offspring that survive. Adult medaka and other aquarium inhabitants may eat eggs and newly hatched fry, so dense planting or a dedicated breeding setup is recommended if you want to raise significant numbers.

Fine-leaved plants, floating plants, spawning mops or similar materials provide excellent places for females to deposit their eggs. Medaka have particularly interesting spawning behaviour. During courtship, the male positions himself alongside the female and uses his enlarged dorsal and anal fins during the spawning embrace. The female releases a cluster of eggs while the male releases sperm, resulting in external fertilisation. After spawning, the female temporarily carries the fertilised eggs attached beneath her abdomen by fine filaments. She may swim around with this cluster for several hours before brushing against plants or other suitable surfaces, where the eggs become attached. Under favourable breeding conditions, a healthy female may produce eggs on a daily basis. The number produced varies according to the female's size, age, condition and environmental conditions.

Development time is strongly influenced by temperature. At warmer breeding temperatures, medaka eggs commonly hatch in approximately 7–10 days, while development can take considerably longer in cooler water. Newly hatched fry are extremely small. Suitable first foods include infusoria, paramecium, finely powdered fry food and other microscopic foods. As the fry grow, they can be moved onto larger foods such as freshly hatched Artemia and finely crushed quality fish food.
Growth rates vary according to temperature, food and husbandry, but medaka can reach sexual maturity in approximately two to three months under favourable conditions.

Diet & Feeding

Glitter Medaka Ricefish are omnivorous and straightforward to feed in captivity. A high-quality small pellet, micro-granule or flake food formulated for omnivorous fish can form the basis of their diet. Because medaka naturally spend a great deal of time near the surface and have an upward-facing mouth, floating or slowly sinking foods are particularly suitable. Their diet can be supplemented with appropriately sized live or frozen foods such as Daphnia, Artemia, mosquito larvae and bloodworm. These foods are particularly useful when conditioning adult fish for breeding, although variety is preferable to relying heavily on any single food.

There is no need to feed bloodworm as a staple food. A balanced prepared diet supplemented with a variety of small live or frozen foods provides a much more complete nutritional profile. Medaka naturally consume small aquatic organisms, insect larvae, zooplankton and other available organic material. A varied diet helps support good condition, strong colouration and successful reproduction. Feed small amounts that the fish can consume readily rather than allowing excess food to accumulate. Overfeeding is one of the most common causes of deteriorating aquarium water quality.