Family: Adrianichthyidae
Northern Medaka — a Adrianichthyidae from Japan, calm, undemanding and well-suited to community life. Reaches 3–4.4 cm; small groups recommended. 18–25 °C.
Oryzias sakaizumii, a member of the family Adrianichthyidae, comes from Japan, where it inhabits warm freshwater streams and lakes. Calm, undemanding and well-suited to community life and unfussy omnivore; varied diet keeps condition, it grows to 3–4.4 cm and adapts well to a properly set-up aquarium in the 18–25 °C range. Other Oryzias species in our database include Oryzias curvinotus, Oryzias javanicus, Oryzias latipes.
A moderate-level species: calm, undemanding and well-suited to community life; stable water matters more than fancy equipment.
Set the heater to 18–25 °C and avoid swings. pH 7–8, GH 5–15 dGH suit it.
Full size is 3–4.4 cm. Minimum tank: 25 L, with open swimming space along its middle of the water column habits.
Unfussy omnivore; varied diet keeps condition. Vary the menu — quality flakes or pellets plus frozen or live foods.
Calm, undemanding and well-suited to community life. Recommended tankmates: Robust schooling cyprinids — Add activity without conflict. Avoid Much larger predators — Risk at night.
Its home waters are Japan — warm freshwater streams and lakes, with still to gentle current.
Low escape risk, but a lid is cheap insurance.
Spawns freely; remove parents to save the eggs. Subtle external differences.