伯纳特低线鱲

Overview

Six or seven bluish flank bars, a substantial tail-base blotch, and very short barbels help identify Opsarius bernatziki. Its speed and feeding enthusiasm make it unsuitable for a quiet general community.

Distribution & habitat

The probable range includes river systems in peninsular Thailand and Myanmar's Tanintharyi region, though its limits remain uncertain. Oxygenated flowing streams away from immediate coastal areas are typical. Rocky substrates are common, but a shallow muddy reach with sandy margins is also documented.

Aquarium setup

Provide a spacious stream-style tank with open swimming routes. Sand, gravel, worn stones, and limited wood can be combined with hardy attached plants. Mature filtration, ample oxygen, and moderate circulation are essential. Prevent organic accumulation with weekly changes of about one-third to one-half. Close the lid carefully against jumping.

Diet & feeding

Surface-dwelling insects provide the main natural feeding pattern, while small fish and bottom invertebrates may also be taken. Use quality preparations with regular live or frozen additions, such as worms and brine shrimp. Gut-loaded fruit flies and small crickets are further options.

Behaviour & compatibility

Slow or hesitant fish can be overwhelmed at feeding time, and tiny companions may become prey. Select robust, similarly sized fishes adapted to compatible river conditions. Keep five or more so hierarchical attention is distributed. Very small groups risk relentless pressure on subordinates, while solitary fish may direct aggression toward similar-looking species.

Sexual dimorphism

Females tend to be larger, fuller, and less colorful. Males develop orange on the lower body when reproductively active.

Notes

The shape and extent of the caudal blotch, together with barbel length, help distinguish relatives. A dark spot at the tail alone does not establish identity.