Approx Max Length : 14cm

Swordtail - Red Wagtail - Xiphophorus hellerii var. "Red Wagtail" Fish Profile & Care Guide

The Red Wagtail Swordtail (Xiphophorus hellerii var. "Red Wagtail") is a popular ornamental variety of the species Xiphophorus hellerii. Characterised by its striking bright red body and contrasting black tail, this variety is highly sought after for its vibrant appearance and active behaviour. Swordtails are named after the distinctive elongated lower lobe of the male's caudal fin, resembling a sword. Native to Central America, swordtails are hardy, adaptable fish that flourish in a wide range of aquarium settings, making them an excellent choice for novice and experienced aquarists.

While Swordtails are not a true schooling fish, Red Wagtail Swordtails are naturally social and prefer to be kept in groups. In the presence of their own kind, they exhibit more confident and active behaviour, frequently interacting with one another. Although they do not form tightly coordinated shoals like Tetras or Rasboras, keeping them in small groups helps reduce stress and encourages natural social dynamics. Males occasionally display territorial behaviour, particularly when competing for females, so maintaining an appropriate male-to-female ratio is essential for group harmony.

Red Wagtail Swordtails are generally peaceful and well-suited to community aquariums. They coexist happily with other calm, non-aggressive fish species. Suitable tank mates include Corydoras Catfish, Tetras, Danios, and peaceful Barbs. It is advisable to avoid housing them with larger, aggressive fish, such as Cichlids, which may harass or harm Swordtails. Males may show some territorial tendencies, especially in smaller tanks, but this is easily managed by providing sufficient space and maintaining a higher ratio of females to males.

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Sexual Dimorphism

Sexual dimorphism in Red Wagtail Swordtails is distinct and easy to identify in mature individuals. Males develop a distinctive, elongated extension on the lower edge of the tail fin, known as the "sword," which is not present in females. Additionally, males are generally slimmer and display more vivid colouration. Another distinguishing feature is the gonopodium, a modified anal fin used for reproduction, which is present in males but absent in females. Females tend to be larger and fuller-bodied, especially when gravid, and possess a fan-shaped anal fin.

Quick Facts

Scientific Name	Xiphophorus hellerii var. "Red Wagtail"
Kingdom	Animalia
Classification	Actinopterygii
Order	Cyprinodontiformes
Family	Poeciliidae
Genus	Xiphophorus
Origins
Approx Max Size	14 cm
Temperament	Peaceful
Aquarium Level	Middle - Top
Difficulty	Beginner
Shoaling	NA
Best kept as	1 Male + Several Females
Diet & Feeding	Omnivore
Reproduction	Livebearer
Average Lifespan	Up to 5 Years

Water Parameters

Water Type	Freshwater
pH	7.0 - 8.0
GH	10 - 30
KH	5 - 20

Ideal Temperature Range
℉	72 - 82
℃	22 - 28

Natural Habitat

In the wild, Swordtails are native to Central America, with a natural range extending from southern Mexico to northern Honduras. They inhabit various freshwater environments, including slow-moving rivers, streams, ponds, and canals, often favouring areas rich in aquatic vegetation. These habitats typically feature warm, slightly alkaline waters with moderate to hard mineral content. The Red Wagtail Swordtail, however, results from selective breeding within the aquarium trade and is not found in natural populations. Despite their domesticated origins, they retain the hardy nature of their wild counterparts.

Breeding

Breeding Red Wagtail Swordtails is straightforward, as they are prolific livebearers. Unlike egg-laying fish, females give birth to fully developed, free-swimming fry. Provided with a suitable environment, swordtails will breed readily without intervention. Females can give birth to 20 to 80 fry per brood, sometimes as often as once a month. However, adult swordtails exhibit no parental care and may consume their young. To improve fry survival rates, aquarists should provide dense planting or breeding boxes to offer refuge or consider moving pregnant females to a separate rearing tank before giving birth.

Diet & Feeding

Red Wagtail Swordtails are omnivores with varied diets in the wild and captivity. In aquariums, they readily accept high-quality flake or pellet foods as a staple. For optimal health and colour vibrancy, their diet should be supplemented with vegetable matter such as blanched spinach, lettuce, or spirulina-based foods, along with living or frozen foods like brine shrimp, daphnia, and bloodworms. A diverse diet promotes not only their bright colouration but also their overall vitality and breeding condition. Feeding small amounts two to three times daily is recommended, ensuring uneaten food is removed to maintain water quality.