Dwarf Rasbora

Physical Characteristics

The Dwarf Rasbora is a very small, slender fish, typically exhibiting a reddish-orange to brownish body color with several distinct dark spots or blotches along its flanks. The fins are largely translucent, sometimes with red or orange hints, especially in males. It has a fusiform body shape, characteristic of many small schooling fish adapted for open water movement.

Habitat & Distribution

This species is found in freshwater environments, specifically in slow-moving streams, swamps, and peat swamps of Southeast Asia, including countries like Malaysia, Singapore, and parts of Indonesia (Sumatra, Borneo). They prefer areas with dense vegetation, tannins-stained (blackwater) conditions, and soft, acidic water.

Size & Weight

The typical size range for Boraras maculatus is about 1.5 to 2.5 cm (0.6 to 1 inch) in total length. They are among the smallest fish available in the aquarium trade and are generally too small to have a significant measurable weight individually.

Similar Looking Species

Several other species within the Boraras genus, such as Boraras brigittae (Chili Rasbora) and Boraras merah (Phoenix Rasbora), are very similar in appearance. Distinguishing features often involve subtle differences in the number, size, and arrangement of body spots, as well as slight variations in coloration. For instance, B. brigittae usually has a more prominent lateral stripe with a black spot, while B. maculatus has distinct, often rounder blotches.

Ecological Role

Dwarf Rasboras play a role as a prey species for larger fish and aquatic invertebrates in their natural habitat. They primarily feed on zooplankton, small insects, and other micro-invertebrates found in the water column and among vegetation. Their schooling behavior provides some protection against predators. The conservation status of Boraras maculatus is not specifically evaluated by the IUCN, but habitat degradation due to deforestation and peat swamp drainage in Southeast Asia poses a potential threat to many species in these ecosystems.

Identified on: 12/14/2025

Mode: Standard