Three Spotted Dwarf Rasbora - Boraras micros : Complete Fish Profile & Care Guide
Table of contents
Introduction
The Three Spotted Dwarf Rasbora (Boraras micros) is a diminutive but captivating freshwater fish native to Asia. Renowned for its peaceful temperament and vibrant colouration, the Three Spotted Dwarf Rasbora is a popular choice among aquarists seeking to enhance the beauty and diversity of their aquariums. Their small size and unique markings make them an attractive addition to aquascapes, offering both visual appeal and a sense of tranquillity to the aquatic environment.
These peaceable shoaling fish thrive in a tranquil and secure environment, making it advisable to maintain a sizable group of at least 12 individuals. A larger assembly not only enhances their sense of security but also creates a natural and captivating shoaling display, with male individuals engaging in intriguing competitive behaviours for female attention.
When considering tankmates, it is essential to select small and non-aggressive species. Suitable companions may include small Caridina and Neocaridina Shrimp, Otocinclus Catfish, Pygmy Corydoras species, smaller Danio species, Dwarf Pencilfish, Pseudomugil Rainbowfish, Kuhli Loaches and Dwarf Gouramis. These Rasboras will definitely be intimidated by larger tankmates, so avoid these entirely.
To provide an ideal habitat, the aquarium should be well-established with abundant hiding places created by driftwood and dense vegetation, including floating plants to diffuse lighting. Adequate filtration and gentle water movement are recommended. Maintaining impeccable water quality is crucial, as Three Spotted Dwarf Rasboras are delicate and intolerant of elevated nitrates or fluctuations in water chemistry.
The Three Spotted Dwarf Rasboras exhibit a distinct colouration pattern characterized by a white head and abdomen, while the remainder of their body possesses a semi-translucent appearance. Notably, a variant with enhanced red pigmentation has been identified in southern Thailand, tentatively referred to as Boraras cf. micros, suggesting the possibility of it being a newly discovered species.
These Rasboras are further distinguished by the presence of three conspicuous dark spots, approximately equivalent in size to the pupil. These spots are situated along the flank at a mid-height position anterior to the pelvic origin, at the base of the posterior anal rays, and at the midpoint of the caudal base.
Three Spotted Dwarf Rasbora Photos
Sexual Dimorphism
Distinguishing between male and female Three Spotted Dwarf Rasboras presents a notable challenge. Typically, in mature specimens, females can be identified by their comparatively larger size and more pronounced, rounded abdomens.
Quick Facts
| Scientific Name | Boraras micros |
|---|---|
| Year Described | 1993 |
| Other Names | Three-spotted Dwarf Minnow, Micro Rasbora, Polkadot Dwarf Rasbora |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Cypriniformes |
| Family | Cyprinidae |
| Genus | Boraras |
| Origins | Thailand |
| Max Size | 2 cm |
| Temperament | Peaceful |
| Aquarium Level | All Levels |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 10+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg Depositor |
| Average Lifespan | Up to 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 7.5 |
| GH | 2 - 10 |
| ℉ | 76 - 82 |
|---|---|
| ℃ | 24 - 28 |
Natural Habitat
The Three Spotted Dwarf Rasbora is a species native to the Mekong Basin in northeastern Thailand, Asia, inhabiting densely vegetated marshlands, ponds, and swamps characterized by clear and comparatively deep waters. Reports indicate the presence of this species in Laos, although information regarding these populations remains somewhat limited and imprecise.
Breeding
To date, there have been no documented instances of successful breeding of the Three Spotted Dwarf Rasbora within domestic aquariums, presenting an intriguing challenge for dedicated aquarists. A breeding setup emulating the conditions successfully for other Boraras species is advisable.
Boraras micros are categorized as continuous spawners, meaning mature individuals lay a few eggs daily. In well-planted tanks housing large groups of conditioned B. micros, spawning should naturally occur, with eggs dispersed across the vegetation and decorations. Although the eggs and subsequent larvae may be preyed upon by adults and other inhabitants, sufficient plant coverage can ensure the survival of some offspring to maturity.
For hobbyists aiming to raise a significant number of fry, establishing a separate breeding tank with a minimalistic design, including an air-driven sponge filter, abundant Java moss or spawning mops, and a mesh layer slightly elevated from the bottom to protect fallen eggs, is recommended. This setup should replicate the water parameters of the primary tank.
Introducing one or two conditioned pairs of these fish can lead to spawning, typically the morning after settling. It is prudent to relocate the adults back to the main aquarium within 48 hours to prevent them from consuming the newly hatched eggs. The fry, initially subsisting on their yolk sacs, will soon require appropriately sized feed such as infusoria and Paramecium, progressing to larger diets like Artemia nauplii as they develop.
Given the continuous spawning, a range of fry sizes may necessitate a varied feeding regimen. Extreme caution is necessary during small, partial water changes to avoid harming the highly sensitive fry.
Diet & Feeding
The Three Spotted Dwarf Rasbora exhibits omnivorous feeding habits, demonstrating a preference for a varied diet that closely mirrors their natural intake in the wild. In captivity, these Rasboras thrive on a balanced mix of high-quality dried foods, such as flakes and micro pellets, designed to cater to their small size.
To complement their nutritional needs, incorporating live and frozen foods like daphnia, brine shrimp, bloodworms, and mosquito larvae into their diet is essential. Such diverse feeding not only ensures the Rasboras receive a comprehensive spectrum of essential nutrients but also promotes vigorous health and vibrant colouration and stimulates natural foraging behaviours.
Regular feeding of these varied food sources is crucial for maintaining the optimal condition and well-being of the Three Spotted Dwarf Rasbora, making them a thriving addition to the home aquarium.
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