Family: Cyprinidae
Longfin Horse-Mouth — a Cyprinidae from eastern Chinese streams, mostly peaceful community fish. Reaches 6.8–9.9 cm; singly or in small groups depending on temperament. 10–20 °C.
Opsariichthys evolans is a Cyprinidae from eastern Chinese streams. In the wild it prefers clear streams and rivers over gravel; in the aquarium it stays mostly peaceful community fish. Plan on 6.8–9.9 cm of adult fish at 10–20 °C. Related profiles: Opsariichthys bidens, Opsariichthys pachycephalus, Opsariichthys hainanensis.
Intermediate difficulty. Mostly peaceful community fish; singly or in small groups depending on temperament.
Set the heater to 10–20 °C and avoid swings. pH 6.5–7.5, GH 5–15 dGH suit it.
Full size is 6.8–9.9 cm. Minimum tank: 118 L, with open swimming space along its bottom-dwelling habits.
Accepts quality flakes, granules and frozen foods. It forages naturally over fine gravel and sand, so let some food reach the bottom.
Yes, with care. Mostly peaceful community fish — pair it with Robust schooling cyprinids — Add activity without conflict and skip Much larger predators — Risk at night.
Native to eastern Chinese streams, where it lives in clear streams and rivers over gravel. Moderate, well-oxygenated current; Appreciates well-oxygenated water.
Not a noted jumper — a standard cover still keeps dust and spray in.
Egg-scatterer; no parental care. Males often slimmer and more colourful.