Scaly Osman (Diptychus maculatus)

Family: Cyprinidae

Scaly Osman — a Cyprinidae from Tibetan Plateau waters, calm giants; anything swallowable is food. Reaches 52.5–77 cm; singly or in small groups in long tanks. 18–26 °C.

Care parameters

Water temperature
18–26 °C
pH
6.5–7.5
GH hardness
5–15 dGH
Adult length
52.5–77 cm
Minimum tank
500 L
Water layer
Bottom-dwelling
Difficulty
Moderate
Temperament
Calm giants; anything swallowable is food
Origin
Tibetan Plateau waters

Species overview

Diptychus maculatus, a member of the family Cyprinidae, comes from Tibetan Plateau waters, where it inhabits clear streams and rivers over gravel. Calm giants; anything swallowable is food and accepts most foods; give it greens as well as protein, it grows to 52.5–77 cm and adapts well to a properly set-up aquarium in the 18–26 °C range. In a community tank it pairs well with Cold-water catfish of similar bulk.

Native biotope

Habitat
Clear streams and rivers over gravel
Flow
Moderate, well-oxygenated current
Dissolved O₂
Appreciates well-oxygenated water

Aquascape & hardware

Substrate
Fine gravel and sand
Hardscape
Water-worn stones and driftwood
Plants
Hardy rooted plants along the margins

Temperament, diet & tankmates

Schooling
Singly or in small groups in long tanks
Diet
Accepts most foods; give it greens as well as protein
Recommended tankmates
  • Cold-water catfish of similar bulk — Share the cool, current-rich regime
Avoid keeping with
  • Small fish — Will be eaten

Breeding & notes

Sexual dimorphism
Males often slimmer and more colourful
Breeding method
Spawning follows cold-season floods in nature; rarely in aquaria

Frequently asked questions

Is Scaly Osman easy to keep?

A moderate-level species: calm giants; anything swallowable is food; stable water matters more than fancy equipment.

What temperature and water chemistry does Scaly Osman need?

Set the heater to 18–26 °C and avoid swings. pH 6.5–7.5, GH 5–15 dGH suit it.

How big does Scaly Osman get, and what tank size?

Expect 52.5–77 cm as an adult, living bottom-dwelling. A 500 L tank or larger gives it room.

What does Scaly Osman eat?

Accepts most foods; give it greens as well as protein. It forages naturally over fine gravel and sand, so let some food reach the bottom.

Can Scaly Osman live with other fish?

Calm giants; anything swallowable is food. Recommended tankmates: Cold-water catfish of similar bulk — Share the cool, current-rich regime. Avoid Small fish — Will be eaten.

Where does Scaly Osman come from?

Native to Tibetan Plateau waters, where it lives in clear streams and rivers over gravel. Moderate, well-oxygenated current; Appreciates well-oxygenated water.

Does Scaly Osman jump?

Not a noted jumper — a standard cover still keeps dust and spray in.

How does Scaly Osman breed?

In the aquarium: spawning follows cold-season floods in nature; rarely in aquaria. Males often slimmer and more colourful.