Blue-eyed Priapella

Males are distinguished by the presence of a gonopodium – a modified anal fin that serves as a reproductive organ – and grow up to 5 cm in length. Females, especially during spawning, are noticeably larger and plumper. The coloration of the fish varies from gray to yellowish. A characteristic feature, from which the species name originates, is their blue eyes.

This fish originates from Central America and is endemic to the Coatzacoalcos and Papaloapan river basins, located in the southeastern regions of Mexico. Both rivers originate in the Sierra Madre mountains, but for most of their course, they flow through tropical forests, forming swampy areas. A typical biotope consists of shallow backwaters where coastal vegetation is very dense, and the substrate is composed of sand, stones, rocks, fallen leaves, and branches. Although the water in swampy areas is usually acidic, here, due to the proximity of the mountains, it is characterized by high hydrochemical parameters.

This fish is distinguished by its peaceful and friendly nature. It is compatible with most freshwater fish species of similar size and temperament that can live in conditions with high general hardness (GH) values. They can be kept individually or in groups.

For a group of 4 fish, the optimal aquarium volume starts from 60 liters. In the aquarium design, it is important to provide both open water areas for swimming and zones with dense aquatic vegetation. The latter will serve as an excellent natural refuge for the fish during reproduction. All other decor elements are chosen by the aquarist at their discretion. Successful maintenance of the Blue-eyed Priapella depends on high water quality (absence of any pollution) and maintaining the hydrochemical composition within acceptable limits. For this, it is necessary to install appropriate equipment and regularly perform aquarium maintenance, including the removal of organic waste (food residues, excrement, etc.) and partial water changes with fresh water.

For the daily diet, foods with a high content of plant components are preferred. Specialized commercial products such as flakes and granules will be an excellent choice. To diversify the diet, Artemia, bloodworms, Daphnia, and other invertebrates can be offered, both frozen and live.

In an artificial habitat, these fish do not have a distinct breeding season, so spawning can occur year-round. In live-bearing species, to which Priapella belongs, the development of fry occurs inside the female's body, meaning they do not lay eggs. The incubation period is quite long, about 1 month. During this time, the female often seeks solitude in plant thickets, where about a dozen fully formed fry, approximately 7 mm in size, then appear. It is recommended to move the fry to a separate tank to protect them from predation by other fish.

The best prevention against diseases is keeping the fish in suitable conditions, providing them with a balanced diet, and avoiding stress caused, for example, by attacks from tank mates. The appearance of signs of illness can be a signal of problems in care. Often, bringing the habitat back to normal contributes to self-recovery, but if the fish's body is severely weakened, medicinal treatment may be required.

When purchasing, choose active fish that stay in the water column and do not show signs of apathy or lying on the bottom. Carefully inspect the skin: there should be no white spots, ulcers, fin damage, or unnatural film on the body. Healthy individuals should have clean and bright eyes, without cloudiness. Since the species is quite timid, fish in the store may appear stressed, but they should react quickly to external stimuli. Avoid purchasing individuals from aquariums where dead fish or signs of infectious diseases in neighbors have been observed. It is recommended to clarify the keeping conditions and diet with the seller, as Priapellas are sensitive to water quality and sudden changes in conditions, which increases the risk of death during transportation and adaptation. When choosing, give preference to individuals with a pronounced blue eye glow, which is a characteristic species trait.