Monica's Tetra - Moenkhausia monicae Fish Profile & Care Guide
Introduction
Monica's Tetras (Moenkhausia monicae) represent a relatively new and captivating addition to the Tetra species, making them an excellent choice for any community aquarium. Their serene and dynamic nature makes them particularly well-suited for novice aquarists seeking to infuse elegance into their tanks. These Tetras are resilient enough to maintain their ground and sufficiently sizeable to avoid predation by other species.
In their natural habitat, Monica's Tetras are known to school; thus, maintaining them in groups of no less than six individuals is crucial. This not only enhances their natural display but also mitigates aggression towards other fish species. Ideally, tankmates should consist of Tetras of similar size, larger Rasboras, Rainbowfish, Barbs, most Danios, and bottom-dwelling species like Corydoras Catfish and Botia Loaches.
Monica's Tetras generally adapt to well-maintained tanks, though they prefer subdued lighting and a moderately adorned environment. Creating an exquisite aquascape can be achieved by simulating an Amazonian biotope setup, complete with a sandy substrate, gracefully twisted driftwood branches, and entangled roots. Including dried leaves, such as beech or oak, will further accentuate the natural ambience.
Regarding appearance, Monica's Tetra exhibits a beige hue along the dorsal portion of the head and body. A scarcely visible humeral spot is concealed by a broad, longitudinal brown stripe extending from the snout and traversing the ventral part of the eye to the base of the middle caudal-fin rays. Additionally, they boast an iridescent green stripe above a broad brown stripe, extending from the opercle to a vertical position through the mid-section of the anal fin.
The upper part of their eyes presents a striking red to yellow colouration, while the lower portion assumes a dark brown shade, surrounded by bright yellow pigmentation around the pupil. The ventral section of the head and body exhibits a cream hue, extending from the posterior region of the head to the base of the last anal-fin ray. The upper and lower lobes showcase vibrant yellow to orange pigmentation, while the remaining fins remain translucent or hyaline in appearance.
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Sexual Dimorphism
Determining the sex of Monica's Tetras can be somewhat challenging. Nevertheless, a few physical distinctions can assist in sex identification. Females, especially those bearing eggs, generally exhibit a slightly larger size compared to males and present a more rounded abdominal region.
Quick Facts
| Scientific Name | Moenkhausia monicae |
|---|---|
| Year Described | 2016 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Characiformes |
| Family | Characidae |
| Genus | Moenkhausia |
| Origins | Brazil |
| Approx Max Size | 5 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 5 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.0 - 7.5 |
| GH | 5 - 20 |
| KH | 4 - 8 |
| TDS | 100 - 200 |
| ℉ | 72 - 79 |
|---|---|
| ℃ | 22 - 26 |
Natural Habitat
Monica's Tetras are indigenous to the upper Rio Juruena and the Rio Tapajós River Basins in Mato Grosso, Brazil. These Tetras predominantly occupy clearwater rivers and streams, characterised by a moderate to rapid water flow. The riverbeds are typically composed of rock, pebbles, and sand. In specific locations, aquatic plants can be found, while a riparian forest is commonly observed in their habitat.
Breeding
Monica's Tetras exhibit egg-scattering free-spawning behaviour and does not engage in parental care. However, for those seeking to achieve a higher yield of fry, a separate breeding tank is recommended. This tank should maintain established water conditions, feature subdued lighting, and ample aquatic plants or spawning mops. Additionally, conditioning the breeding pairs with live, frozen, or freeze-dried foods, such as bloodworms or mosquito larvae, will effectively encourage reproduction.
During the spawning process, the females become more active, and males initiate physical contact by bumping into them. The fish then interlock fins and execute somersault movements amidst the aquatic plants. Subsequently, the female scatters her eggs, and the male fertilises them. It is not uncommon for females to lay several hundred eggs during a single spawning event.
Once the females have concluded scattering their eggs and the males have successfully fertilised them, removing the adult fish from the breeding tank is advisable. Ensuring a darkened environment is crucial, as Tetra eggs and fry are particularly susceptible to light. Within 24 to 48 hours, the eggs will hatch, contingent upon the prevailing temperature, with the fry becoming free-swimming approximately three to four days later.
Initially, the newly hatched fry will sustain themselves by feeding on their yolk sac. As they transition to the free-swimming stage, providing nourishment through rotifers or infusoria is recommended. As they continue to grow, offering baby brine shrimp and crushed flakes will support their development.
Diet & Feeding
Monica's Tetras display a versatile dietary behaviour and readily consumes various food types. To ensure their well-being and vibrant appearance, a regular feeding schedule comprising small live, frozen, and freeze-dried foods is recommended. Options such as daphnia, bloodworms, and brine shrimp can be incorporated into their meals.
In addition to the live and frozen choices, including high-quality dried foods, such as flakes and granules, is beneficial in their diet. Supplementing their feeding regimen with vegetables, like blanched courgette or spinach leaves, provides valuable nutrients and is appreciated by these fish.
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Published: 04 Aug 2023
Last Updated: 04 Aug 2023