虹彩野鲮

Overview

Identification matters particularly for Epalzeorhynchos munense. Live fish combine a dark head, body and anal fin with red dorsal and caudal fins and dark edging on paired fins. Much captive guidance is inferred from relatives rather than extensive observations of confirmed specimens.

Distribution & habitat

Confirmed collections include the Mun and other middle-Mekong tributaries in Thailand and Laos. A Tonle Sap record may concern a related species. Detailed habitat use is unconfirmed; river residence and wet-season movement into flooded land are known in congeners.

Aquarium setup

Offer cover among rocks and wood, plus hardy attached plants. Illuminate some surfaces for grazing while retaining sheltered recesses. Clean oxygenated water with moderate circulation is appropriate. Space and visual separation deserve priority when considering companions.

Diet & feeding

Supply both animal and plant foods rather than treating it as an algae-only feeder. Small live or frozen invertebrates, quality prepared food and vegetables suit the described grazing diet. Settled fish may also take offered food away from the bottom.

Behaviour & compatibility

By comparison with relatives, increasing territoriality is expected as the fish matures. A single specimen is therefore the cautious default. Similar-looking bottom fishes are risky companions; robust active upper-water species are more plausible. Introduce this fish last, and regard multi-individual keeping as an uncertain undertaking even in a very large aquarium.

Sexual dimorphism

Mature females are expected to be fuller than males, although that remains a tentative sexing guide.

Notes

Loss of red coloration in preserved specimens has complicated historical descriptions. Pale-finned cultivated relatives can also be mislabeled. A single white or yellowish fin does not establish a correct identification.