Akysis vespertinus · Western Stream Catfish

Overview

Exceptionally uncommon in trade, Akysis vespertinus has a narrow snout giving the head a triangular outline and two pale saddles behind the dorsal fin. Soft sand, crevices, and ample oxygen are essential layout considerations.

Distribution & habitat

Known sites are headwaters of Ann Chaung draining the western Rakhine mountains of Myanmar. Wider local occurrence is plausible but unconfirmed. The genus typically inhabits fast streams over sand and stone, with scattered leaves or roots and stronger, more turbid flows during rains.

Aquarium setup

Use fine soft sand for burial and arrange worn rocks and branching wood into accessible cracks. Attached plants and mosses withstand burrowing better than rooted growth, and leaves may be included. Maintain clean, oxygenated flowing water with weekly 30–50% changes.

Diet & feeding

Use the genus’s nighttime small-prey feeding pattern as a guide: offer live or frozen Artemia, Daphnia, and bloodworms, initially after dark. Chop food for very small fish. Settled individuals may emerge at feeding times, but acceptance of dry foods is uncertain.

Behaviour & compatibility

Avoid large or aggressive neighbors. Peaceful tiny shoalers, comparable stream catfish, and selected hillstream loaches are possibilities. Check other loaches for eventual size and territoriality. Single or group care is possible because conspecific aggression is absent, and coexistence with freshwater shrimp has been observed.

Breeding

Reproduction is unreported. Cooling-associated spawning in a related species offers only a possible basis for experimentation, not a documented protocol for this fish.

Notes

The narrow snout, triangular head, and paired pale saddles aid identification; the abdomen lacks brown pigmentation. Dorsal and pectoral spines can cause painful stings, so avoid grasping the fish during handling.