Guama Guppy - Micropoecilis minima Fish Profile & Care Guide
Introduction
The Guama Guppy (Micropoecilia minima) is a captivating species of livebearer fish known for its delicate size and striking colours, making it a favourite among aquarium enthusiasts. With males displaying vibrant hues and ornate patterns, Guama Guppies add an element of elegance to any aquascape. Despite their small size, they exhibit fascinating social behaviours and are relatively hardy, provided water quality is well-maintained. Ideal for nano or biotope aquariums, these peaceful fish coexist well with other small, non-aggressive species, making them a versatile and enchanting choice for both novice and experienced aquarists.
Guama Guppies are a peaceful and social species, often seen shoaling in small groups in the wild. In aquariums, it is best to house them in groups of at least 6 to 8 individuals to encourage natural behaviour and reduce stress, as they feel more secure when surrounded by their kind. They are compatible with other small, peaceful tankmates, such as Corydoras Catfish, small Tetras, and Dwarf Shrimp. However, care should be taken to avoid housing them with larger or more aggressive fish, which may intimidate or outcompete them for food.
Guama Guppies thrive in an aquarium setup that closely mimics its natural habitat. A tank size of at least 40 litres (10 gallons) is recommended for a small group, with larger tanks preferred for mixed-species setups. They require stable water conditions, ideally softer and slightly acidic. A heavily planted aquarium is ideal, providing plenty of cover and mimicking the vegetative environments they inhabit in the wild. Live plants like Java moss, Vallisneria, and Amazon swords are excellent choices. Driftwood and leaf litter can be added to create a naturalistic setup and to release tannins, which can help stabilise pH levels and create a more suitable environment.
Filtration should be gentle to avoid strong currents, as these fish prefer calm waters. A sponge filter or adjustable low-flow filter is ideal. Regular 25–30% weekly water changes are essential to maintain water quality and prevent nitrate build-up. Lighting should be moderate to highlight the vibrant colours of the fish without promoting excessive algae growth. This species is sensitive to poor water conditions, so close monitoring of parameters and consistent maintenance is key to their health and well-being.
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Sexual Dimorphism
Differentiating between male and female Guama Guppies is relatively simple. Males are always smaller and more colourful than females, featuring distinct gonopodia (modified anal fins) used for reproduction. While females have a more subdued appearance, males can display an appealing combination of colours depending on the lighting. Males often exhibit a blue-black dot on their sides, complemented by orange, red, or green patches. The colouration may extend into the tail, but unlike fancy guppies, it does not cover the caudal fin entirely.
Quick Facts
| Scientific Name | Micropoecilis minima |
|---|---|
| Year Described | 1997 |
| Kingdom | Animalia |
| Classification | Actinopterygii |
| Order | Cyprinodontiformes |
| Family | Poeciliidae |
| Genus | Micropoecilis |
| Origins | Brazil |
| Approx Max Size | 2.5 cm |
| Temperament | Peaceful |
| Aquarium Level | Middle - Top |
| Difficulty | Beginner |
| Shoaling | NA |
| Best kept as | Groups 6+ |
| Diet & Feeding | Omnivore |
| Reproduction | Livebearer |
| Average Lifespan | Up to 2 Years |
Water Parameters
| Water Type | Freshwater |
|---|---|
| pH | 6.0 - 7.5 |
| GH | 2 - 12 |
| ℉ | 75 - 82 |
|---|---|
| ℃ | 24 - 28 |
Natural Habitat
The Guama Guppy is native to Brazil, specifically the Guamá River basin, as well as slow-moving, shallow streams and wetlands throughout the region. These fish thrive in vegetated areas with minimal water currents. Their natural habitat is defined by soft, slightly acidic to neutral water, often featuring a sandy or muddy substrate. The environment is typically rich in leaf litter and decaying organic material, contributing to tannin-stained, tea-coloured water. Overhanging vegetation provides shade, creating dim lighting and plenty of cover, ideal for these guppies to thrive.
Breeding
Breeding Guama Guppies in captivity is relatively straightforward when optimal conditions are provided. A well-kept aquarium with stable water parameters and a suitable temperature promotes successful breeding. During courtship, males display vibrant colouration and perform subtle movements to attract females. Once mating occurs, females can store sperm for several months, allowing them to produce multiple broods without repeated mating.
Depending on water temperature and environmental conditions, gestation lasts around 4 to 6 weeks. Females often show a dark gravid spot near the anal fin as pregnancy progresses. When ready to give birth, females prefer calm, secluded areas of the tank. To protect the fry, it is advisable to provide lush vegetation, such as Java moss or fine-leaved plants, as hiding spots. Alternatively, the pregnant female can be temporarily moved to a separate breeding tank.
Fry are fully formed at birth and can feed on finely crushed high-quality flakes, baby brine shrimp, or infusoria. For optimal growth, the fry should be kept in a separate tank until they are large enough to avoid being eaten by adult fish. Frequent water changes and a nutrient-rich diet are essential for healthy development. Breeding success is often higher when maintaining a balanced male-to-female ratio, such as one male for every 2 or 3 females, to reduce stress on the females.
Diet & Feeding
Guama Guppies are omnivorous and thrive on a varied diet in their natural habitat and aquarium settings. In the wild, they feed on small invertebrates, algae, and organic detritus. In captivity, they readily accept a variety of foods, making them easy to care for.
A balanced diet for Guama Guppies includes high-quality flakes or micro-pellets as a staple, supplemented with live or frozen foods such as brine shrimp bloodworms or daphnia to meet their protein needs. They also benefit from plant-based foods, such as spirulina or blanched vegetables like zucchini or spinach, which support digestion and overall health.
To maintain their vibrant colours and ensure optimal health, it is best to feed them small amounts 2 to 3 times daily. This ensures everything is consumed within a few minutes to avoid overfeeding and water quality issues. Regularly providing a varied diet mimics their natural feeding habits and promotes their activity levels and reproductive health.
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Published: 16 Jan 2025
Last Updated: 17 Jan 2025