Sawbwa resplendens (Sawbwa Barb)

22 May 2026

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Endemic to Lake Inle in Myanmar, the Sawbwa Barb (or Asian Rummynose) is a striking, completely scaleless micro-cyprinid. Males boast a bright red head and tail tips against a silvery-blue body. Their peaceful schooling nature and unique appearance make them highly sought after by nano aquarium enthusiasts.

Overview

The Sawbwa Barb (Sawbwa resplendens), frequently referred to as the Asian Rummynose or Naked Microrasbora, is a truly unique freshwater fish. Its most distinguishing feature is its complete lack of scales, giving its skin a smooth, iridescent quality. Males display a striking contrast of a silvery-blue body capped with a vivid red face and matching red tips on their tail fins. Because of their scaleless nature, they require pristine water conditions and careful attention to water parameters, making them a moderately challenging but highly rewarding species for dedicated aquarists.

Distribution and Habitat

This species is entirely endemic to Lake Inle and its surrounding watershed in the Shan State of Myanmar. The lake is situated at a high altitude, resulting in slightly cooler water temperatures than typical tropical environments. The Sawbwa Barb is most commonly found in the shallow margins of the lake, darting among dense patches of submerged vegetation, reeds, and floating plants. The water here is clear, well-oxygenated, and notably alkaline and hard due to the limestone substrate of the region.

Description of Sawbwa Barb

Body shape:

They possess a slender, elongated, and torpedo-like body shape that is entirely devoid of scales, giving them a distinctively smooth and delicate appearance.

Color:

This species is highly sexually dimorphic. Mature males exhibit a stunning silvery-blue body with a brilliantly colored, deep red or orange-red head and snout. Females and juveniles are much plainer, typically displaying a uniform silvery-grey or light olive-brown coloration without any red markings.

Barbels:

Unlike many other cyprinids, the Sawbwa Barb does not possess any barbels around its mouth.

Snout:

The snout is relatively short, blunt, and slightly terminal, perfectly adapted for picking small organisms out of the water column.

Eyes:

They have large, prominent eyes relative to their small head size, featuring a dark, distinct pupil surrounded by a lighter ring.

Fins:

The dorsal, anal, and pectoral fins are mostly transparent or slightly frosted, allowing the vibrant body colors to stand out.

The Tail:

The caudal (tail) fin is deeply forked. In males, the tips of both the upper and lower lobes feature bright red or orange spots, mirroring the coloration of their heads.

Temper

The Sawbwa Barb is an exceptionally peaceful, albeit somewhat timid and skittish, species. They do not bother other tank mates but can easily be outcompeted or stressed by larger, boisterous, or aggressive fish.

Sociality

They are a highly gregarious schooling fish that relies on the presence of their own kind to feel secure. They should always be kept in groups of at least 8 to 10 individuals. Keeping a larger group with a balanced ratio of males to females will encourage the males to display their best colors as they harmlessly spar for female attention. They do best in a species-only setup or alongside other peaceful micro-fish like Danionellas or small Rasboras.

Activity

These fish are active mid-to-top level swimmers. During the day, the school will continuously patrol the open swimming areas of the tank, periodically darting into the safety of plants if startled.

Keeping and Caring for Sawbwa Barb

Tank size:

A minimum tank size of 15 gallons (approx. 60 liters) is required to provide enough swimming space for a proper school and to help maintain the stable water conditions this scaleless fish demands.

Water Parameters:

Temperature

They prefer cooler water than many tropical fish, thriving best between 20-24°C (68-75°F).

pH

The water should be neutral to slightly alkaline, with a pH ranging from 7.0 to 8.0.

Hardness

They originate from a limestone-rich lake and require moderately hard to hard water, ideally between 12-20 dGH.

Ammonia, Nitrite, Nitrate

Ammonia and Nitrite must always remain at 0 ppm, and Nitrates should be kept below 20 ppm. Because they lack scales, they are highly susceptible to poor water quality and medications.

Lighting

Moderate to somewhat dim lighting is preferred. Bright lighting can wash out their colors and make them feel exposed unless plenty of shade is provided.

Water flow

A gentle to moderate water flow mimics their natural lake habitat. Avoid overly strong currents that might exhaust these small fish.

Decorations and Plants

The aquarium should be densely planted, particularly around the back and sides, to provide ample hiding spaces. Fine-leaved plants, mosses, and floating plants are excellent choices. Ensure there is still a generous open area in the center or upper levels of the tank for schooling. A dark substrate will help bring out the brilliant colors of the males.

Diet

In the wild, they are micro-predators feeding on zooplankton, small insects, and tiny crustaceans. In the aquarium, they are generally unfussy omnivores but require small-sized foods appropriate for their tiny mouths.

Some Feeding Tips

Provide a varied diet of high-quality crushed flakes or micro-pellets. To maintain their vibrant red coloration and overall health, supplement their diet regularly with live or frozen foods such as Daphnia, baby brine shrimp (Artemia), cyclops, and microworms.

Breeding

Sawbwa Barbs are continuous egg scatterers that offer no parental care and will eat their own eggs if given the chance. To breed them, set up a separate, dimly lit breeding tank with slightly cooler water, a sponge filter, and plenty of fine-leaved plants or spawning mops. Condition the adults with live foods, then introduce a group to the breeding tank. Once eggs are spotted scattered among the plants, promptly remove the adult fish. The fry are exceptionally tiny and will require infusoria or paramecium for the first several days before graduating to baby brine shrimp.

Conclusion

The Sawbwa Barb is a mesmerizing and highly rewarding micro-fish that brings a unique "rummynose" aesthetic to the Asian biotope or planted nano aquarium. While their scaleless bodies make them sensitive to water quality fluctuations, an aquarist who provides stable, clean, and slightly hard water will be treated to a lively, peaceful, and beautifully colored school of fish.

Fish info

Care level: Moderate
Temperament: Peaceful
Adult size: 2.5-3.5 cm
Life expectancy: 3-5 years
Fish type: Cyprinid
Temperature : 20-24°C
pH: 7.0-8.0
Color Form: Blue, Clear, Red, Silver

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