厚背波鱼

Overview

The black dorsal tip and rounded tail-base mark help identify Rasbora dorsinotata, a small stream fish from northern Thailand and Laos. It remains poorly represented in aquarium records, so husbandry should respect its clear flowing-water habitat.

Distribution & habitat

Its apparent range lies within the Mekong and upper Chao Phraya systems. Clear minor tributaries are preferred over main river channels, with records including the upper Wang in Thailand and northern Lao waters.

Aquarium setup

Use a minimum footprint of 90 by 30 cm with a stream-style arrangement of smooth stones, sand and gravel. Hardy attached plants can accompany limited woodwork. Maintain oxygenation and circulation, with weekly changes of roughly thirty to fifty percent. Accumulating organic waste is likely to be poorly tolerated.

Diet & feeding

Small invertebrates are the probable natural prey. Suitable dry foods should be accepted, supplemented with regular small live or frozen meals.

Behaviour & compatibility

It is expected to be peaceful, making similarly adapted stream fishes potential companions. Observe compatibility rather than assuming it. A group of at least six supports confidence and more natural behavior.

Sexual dimorphism

Mature females are expected to be rounder and perhaps slightly larger, rather than these being firmly established diagnostic differences.

Breeding

Breeding may be unrecorded for this species. A trial could follow relatives: condition adults, use a separate dim tank with protected eggs and gentle aeration, and add cooler water in small portions. Remove the adults after a couple of days. Development times commonly quoted for related rasboras are not a verified schedule here. Prepare appropriately small live food before attempting the process.

Notes

The lateral band ends in a rounded mark before entering the caudal fin and broadens in front of the dorsal origin. This combination is more useful than the presence of a dark spot alone.