吉氏南鳅

Overview

Schistura geisleri is a small, sociable loach that quickly buries itself when alarmed. It is more peaceful toward its own kind than many territorial congeners. Keep at least four and provide accessible sandy areas.

Distribution & habitat

Most records concern Thailand's Chao Phraya system, with additional occurrences in northern Mekong tributaries and the southern Tapi drainage. Southern fish may represent an undescribed species, so geographically separate stocks should not automatically be treated as identical.

Clear, well-oxygenated streams support small foraging groups over sand. Localities include slower reaches as well as shallow riffles with pebbles and moderate flow, sometimes shaded by forest.

Aquarium setup

Combine sand with smooth stones of different sizes, leaving room for burial. Branches add shade and refuges, and hardy plants can be attached to the structure. Maintain good oxygenation and suitable circulation.

Use a biologically mature aquarium and effective filtration. Regular weekly partial changes are necessary because accumulated organic waste is poorly tolerated. A newly started aquarium is inappropriate.

Diet & feeding

Related loaches feed mainly on small animal prey; minor plant material may arrive through prey stomach contents. Offer suitable dry products with regular small live or frozen foods, including water fleas, brine shrimp, and bloodworms.

Behaviour & compatibility

A group of four or more is recommended. Peaceful open-water cyprinids from similar habitats can encourage the fish to emerge. Compatible hillstream fishes are other possibilities. Many superficially similar loaches are much more territorial, so shared genus membership is not a sound compatibility test.

Sexual dimorphism

Adult males possess a prominent suborbital flap and a thickened first branched pectoral ray bearing rows of small tubercle-like structures.

Breeding

At least one aquarium spawning has occurred after two males and four gravid females were moved to a separate aquarium with coarse gravel. Adults were removed afterward. Detailed hatching and fry-rearing information is not established by that account.

Notes

Young fish have stronger lateral blotches and dorsal saddles. As they grow, saddles may extend downward and connect with flank marks while becoming less dark. Pattern and origin should accompany behavioral clues during identification.