Ethereal Danio - Danionella cerebrum Fish Profile & Care Guide
Introduction
Danionella cerebrum is a fascinating miniature cyprinid fish species formally described in 2021. Previously misidentified as Danionella translucida due to its close resemblance and overlapping geographical distribution, it has since been recognised as a distinct species. One of its most remarkable traits is its ability to produce sounds exceeding 140 decibels, which is impressive for its size. This sound is generated by specialised muscles that tension cartilage, which is then released to strike the swim bladder. This unique mechanism facilitates intraspecific communication, with the loudest males often suppressing the sound production of others in the group.
In addition to its acoustic abilities, Danionella cerebrum captivates fish enthusiasts with its diminutive size, translucent body, and rich behavioural repertoire. Its optical transparency, which persists into adulthood, makes it a striking addition to aquariums and a subject of interest for scientific study. These qualities and unique communication behaviours make the Danionella cerebrum an intriguing choice for dedicated aquarists and researchers alike.
In captivity, these fish exhibit shoaling behaviour, preferring to swim in groups, which provides them with a sense of security and encourages natural behaviours. Retaining a group of at least six individuals is recommended to promote their well-being and reduce stress. When selecting tankmates for Danionella cerebrum, it's essential to consider their small size and peaceful nature. Suitable companions include other small, non-aggressive species that thrive in similar water conditions. Avoid housing them with larger or more aggressive fish, which can lead to stress or predation.
Regarding aquarium requirements, Danionella cerebrum thrives in well-maintained tanks, replicating their natural habitat. A tank size of at least 40 litres is suitable for a small group, with gentle filtration to ensure clean water without creating strong currents. Incorporating live plants, soft substrates, and subdued lighting can help mimic their natural environment, promoting natural behaviours and reducing stress.
The body of Danionella cerebrum is primarily colourless and translucent, with a few distinct markings. A yellowish tint covers the top of the skull, while dark pigment spots, known as melanophores, are scattered in specific patterns. These include irregular spots on the head and sides, a line along the back edge of the shoulder area, and rows running diagonally down the body near the spine. Additional melanophores can be seen along the anal fin muscles, starting near the vent and continuing along the tail base, as well as on the anal fin itself and its first rays. There's also a cluster of dark spots at the end of the tailbone.
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Sexual Dimorphism
Danionella cerebrum exhibits notable sexual dimorphism, with distinct differences between males and females. Males possess specialised anatomical structures associated with sound production, including more robust outer and inner arms of the os suspensorium. These structures facilitate the generation of sounds exceeding 140 decibels, a behaviour not observed in females. In contrast, females are generally deeper-bodied, especially when gravid, with visible eggs within the body cavity.
Quick Facts
| Scientific Name | Danionella cerebrum |
|---|---|
| Year Described | 2021 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Cypriniformes |
| Family | Cyprinidae |
| Genus | Danionella |
| Origins | Myanmar |
| Approx Max Size | 1.4 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner - Intermediate |
| Shoaling | Yes |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Egg-Scatterer |
| Average Lifespan | Up to 2 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.5 - 7.5 |
| GH | 4 - 12 |
| ℉ | 72 - 86 |
|---|---|
| ℃ | 22 - 30 |
Natural Habitat
Danionella cerebrum is a diminutive, translucent fish species endemic to Myanmar. This species resides in the cloudy, shallow streams that flow along the southern and eastern slopes of the Bago Yoma mountain range and in the irrigation channels situated to the southwest of Hmawbi within the Yangon Division.
Breeding
Breeding Danionella cerebrum in captivity presents unique challenges due to the limited information about their reproductive behaviours and requirements. As a recently described species, comprehensive studies on their breeding patterns are scarce. However, general observations from related species can offer some guidance.
Diet & Feeding
Currently, there is limited specific information available regarding the diet of Danionella cerebrum in both their natural habitat and captivity. However, insights can be drawn from the dietary habits of closely related species within the Danionella genus. In the wild, species like Danionella translucida feed on small invertebrates, plankton, and microscopic organisms in their freshwater environments. This suggests Danionella cerebrum may have similar feeding preferences, primarily consuming tiny aquatic prey.
For aquarists aiming to maintain Danionella cerebrum in captivity, it is advisable to provide a diet that mirrors these natural feeding habits. Offering live or frozen foods such as daphnia, rotifers, infusoria, and newly hatched brine shrimp can cater to their predilection for small prey items. Additionally, finely crushed high-quality micro pellets or flakes designed for small tropical fish may be accepted.
Observing the fish during feeding times is crucial to ensure they are actively consuming the provided food. Due to their diminutive size and potential competition from other tank inhabitants, monitoring feeding closely to confirm that Danionella cerebrum individuals are receiving adequate nutrition is important.
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Published: 15 Jan 2025
Last Updated: 17 Jan 2025