Mirabilis Eartheater - Geophagus mirabilis Fish Profile & Care Guide
Introduction
The Mirabilis Eartheater (Geophagus mirabilis), is a captivating freshwater fish species highly coveted by aquarists for its remarkable appearance, captivating behavior, moderate size, and ease of maintenance and breeding. Originating from South America, these fish present enthusiasts with a unique opportunity to admire the beauty of South American aquatic life up close. With their striking features and manageable care requirements, Geophagus mirabilis stands as a prized addition to freshwater aquariums, enriching the aquatic environment while providing aquarists with an immersive experience in the wonders of South American aquatic ecosystems.
For a harmonious aquarium environment, it is recommended to keep these Eartheaters in a group with similar-sized individuals. Disproportionate growth rates within the group can lead to dominance and intimidation of smaller members. Ideal tank mates include congenial South American Cichlids, sizeable Tetras, and larger Barb species. Other compatible species encompass Red Fin Plecos, Red Spotted Severums, Keyhole Cichlids, and various Catfish varieties.
Despite their penchant for sifting sand, Mirabilis Eartheater is known to coexist amicably with many bottom-dwelling species, thanks to their inherently calm demeanour. As a gregarious species, the Stripetail Geophagus flourishes in groups of five or more. Given their medium to large adult size, an aquarium with a minimum capacity of 300 litres is advisable. Their habitat should include a deep, soft, sandy substrate to protect their sensitive mouths and gills from abrasion.
Incorporating structural elements like rocks and bogwood provides essential shelter. It’s important to install these elements before adding the substrate to ensure stability and prevent accidental injuries from shifting decor. Due to their digging habits, maintaining a planted aquarium can be challenging, as they may uproot plants. A practical approach involves using potted plants or epiphytic varieties like Anubias and Java Fern, which can be anchored to hardscape features without needing soil.
Effective filtration is crucial for Mirabilis Eartheater, especially in a community setup. A robust filtration system, capable of circulating at least five times the aquarium's volume per hour, is necessary to uphold optimal water quality. Regular water changes and vigilant monitoring of water parameters are indispensable for maintaining their health.
The Mirabilis Eartheater boasts a sleek, greyish-silver body that transitions to a white underside, accentuated by a captivating pattern of iridescent spots and lines on the head. Notably, the area between the pelvic and pectoral fins and the pre-pelvic area features scattered yellow to orange spots, while the pectoral fins remain translucent. Their fins mirror the coloration of the head, with the same ground coloration.
Adding to their distinctive appearance are two to six large black spots arranged along the flank and a characteristic black mid-lateral spot. Their fin patterns exhibit a fascinating array of spots, bands, and stripes, particularly on the caudal fin. Their eyes, sporting a brownish-gray hue, are framed by a delicate ring of light yellow. Dorsally, the head displays a brownish-grey shade from the upper lip to between the eyes, while the sides feature a captivating blend of brownish-orange hues adorned with bluish iridescent markings and spots, contributing to their striking overall appearance.
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Sexual Dimorphism
Sexual differentiation in Mirabilis Eartheater presents a challenge until they near the breeding phase, where the disparities between males and females become more evident. Generally, mature males tend to be slightly larger and showcase longer fins compared to females. Furthermore, during the spawning period, the female's ovipositor becomes visibly prominent, providing a clear indicator of her gender.
Quick Facts
| Scientific Name | Geophagus mirabilis |
|---|---|
| Year Described | 2015 |
| Other Names | Sparkle Eartheater |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Cichliformes |
| Family | Cichlidae |
| Genus | Geophagus |
| Origins | Brazil |
| Approx Max Size | 20 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle |
| Difficulty | Intermediate |
| Shoaling | NA |
| Best kept as | Groups 5+ |
| Diet & Feeding | Omnivore |
| Reproduction | Mouthbrooder |
| Average Lifespan | Up to 10 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 5.5 - 7.5 |
| GH | 2 - 12 |
| TDS | 18 - 268 |
| ℉ | 72 - 86 |
|---|---|
| ℃ | 22 - 30 |
Natural Habitat
The Mirabilis Eartheater establishes its habitat in the upper Rio Madeira within the Amazon Basin, upstream of the Dardanelos/Andorinhas falls in the Matto Grosso state of central Brazil. Additionally, it is found along a considerable stretch of the Rio Aripuanã drainage in the Brazilian Amazon Basin. Remarkably, this species is the sole representative in its genus to inhabit areas upstream from the falls.
In terms of preferred habitats, the Mirabilis Eartheater gravitates toward environments resembling those favored by its related species. These habitats typically feature gently sloping marginal zones characterized by soft substrates, such as bare sand or mud, often adjacent to shores or islands. Depending on the specific location, additional habitat elements may include scattered rocks, submerged tree roots, branches, and leaf litter, all contributing to a natural and conducive environment for these fish.
Breeding
Successful breeding of the Mirabilis Eartheater hinges greatly on the formation of breeding pairs. This is best achieved in a spacious aquarium housing several individuals, allowing for the observation of group dynamics and the identification of potential mating pairs through their interactions. Once a bonded pair is established, it is crucial to transfer them to a dedicated breeding tank, providing a serene environment conducive to spawning and nurturing their offspring. Notably, Mirabilis Eartheaters are mouthbrooders, with the female taking on the responsibility of carrying and tending to the eggs and fry in her mouth until they become capable of independent swimming.
The breeding tank should be equipped with flat, smooth surfaces such as slate or ceramic tiles, positioned over a sandy substrate preferred by these fish for egg laying. Courtship behavior, characterized by circling, fin displays, and mouth interactions, precedes the selection and preparation of these surfaces for egg deposition. While flat rocks are commonly utilized, some pairs may opt to clear away sand, revealing the glass bottom of the tank as an alternative spawning site.
Following egg fertilization, both parents initially guard the eggs for one to two days before the female commences mouthbrooding. She carries the developing eggs in her mouth until the fry hatch and is capable of free swimming. At this juncture, removing the parents is advisable to allow the fry to grow independently. Providing the fry with appropriate nutrition is paramount for their development. Initial feeding should comprise specially formulated fry food or live options such as brine shrimp nauplii, microworms, or vinegar eels. As the fry progresses, their diet should transition gradually to small, sinking pellets tailored for young Cichlids, ensuring they receive the necessary nutrients for robust growth.
Diet & Feeding
The dietary preferences of the Mirabilis Eartheater set it apart within its family, requiring special attention to food size. Adult specimens of this species thrive on smaller portions, emphasizing the importance of incorporating small to medium-sized food items into their regular diet. Their natural behavior of sifting through sand dictates the preference for sinking food types, aligning with their innate foraging habits. Consequently, sinking pellets tailored for omnivorous fish serve as a suitable foundation for their nutrition.
As versatile omnivores, Mirabilis Eartheater can also benefit from occasional protein-rich treats such as bloodworms and brine shrimp, adding variety and nutritional value to their diet. However, caution should be exercised when offering chopped frozen shrimp, ensuring proper preparation to avoid any potential adverse dietary effects. This tailored approach to diet ensures the optimal health and well-being of the Mirabilis Eartheater in captivity.
Other South American Cichlids
Published: 22 Feb 2024
Last Updated: 22 Feb 2024