Saberfin

Adults reach a maximum length of 4 cm. This species exhibits pronounced sexual dimorphism. Males have a more graceful body structure and are distinguished by vibrant coloration, including purple, reddish, and orange hues. Their main distinguishing feature is their high, pointed, turquoise dorsal and anal fins, resembling wings, as well as elongated edges of the caudal fin. Females, in contrast, are more modest: their coloration, fin shape, and size are less pronounced.

These fish originate from South America. They can be found in Venezuela, in the Orinoco River basin, where they prefer to inhabit temporary floodplain lakes and swamps that form after river overflows.

These fish behave amicably towards their conspecifics, especially if kept in a group where there are 2–3 females per male. A shortage of females or an excess of males inevitably leads to intense competition, which can result in injuries. Co-housing with active, territorial, or aggressive species should be avoided. The optimal solution is to set up a species-specific aquarium.

In nature, Saberfins are often found in small, drying water bodies, which makes them undemanding regarding aquarium volume. A 20 L tank may be sufficient for a single pair. For aquarium decor, it is recommended to use dark, soft substrate covered with a layer of fallen leaves and snags. It is also important to provide an abundance of aquatic plants, including floating ones, which effectively create shade. Keeping these fish is considered challenging even for experienced aquarists. Saberfins are often acquired at the larval stage or even as eggs packaged in dry peat briquettes. Residents of their natural habitats may catch wild specimens. In all cases, long-term acclimatization is not possible, so it is critically important to provide Saberfins with conditions as similar as possible to their natural habitat: soft, acidic water with a high tannin content and a temperature range of 20–25°C. For the same reason, these fish do not always adapt to alternative foods, such as dry foods, and require exclusively live foods. It is advisable to clarify the specific keeping and feeding requirements with suppliers.

In nature, they feed on small invertebrates. In aquarium conditions, they accept only live foods such as daphnia, cyclops, or artemia. Dry commercial foods are usually ignored, so to maintain the fish's health, regular access to high-quality live cultures must be ensured.

This is a seasonal species, whose spawning in nature coincides with the rainy season. For breeding in an aquarium, a spawning tank with a soft peat substrate at the bottom is used. The eggs are laid in the peat, after which the substrate is removed, slightly dried, and stored in a sealed container for 4 to 10 months, depending on the temperature. Embryo incubation is completed after the peat is flooded with soft water, after which fry hatch and are fed with infusoria and artemia nauplii.

Fish are sensitive to water quality and sudden changes in its chemical parameters, which can lead to stress and reduced immunity. If keeping conditions are not met, they are prone to fungal infections and bacterial diseases. Prevention includes maintaining stable environmental parameters, regular water changes, and strict adherence to the temperature regime.

When purchasing, select active specimens with clean fins and no visible skin damage. It is important to ensure that the fish show interest in the live food offered. Due to their short life cycle and specific keeping requirements, it is recommended to acquire young specimens, avoiding fish with signs of emaciation or sluggish behavior.