Pristella Tetra

This is a small and rather slender fish, reaching a length of 4–5 cm as an adult. Its body has a silvery or golden sheen, which is due to the special refraction of light by its scales, which, like the fish itself, are mostly transparent. The caudal fin has a reddish hue, while the other fins have a notable coloration with alternating colors: a yellow streak at the base, a black band in the middle, and a white tip at the end of the fin.

Males are distinguished by a more slender physique, while females, especially during spawning, appear fuller, with a noticeably rounded abdomen due to the roe.

This fish species is widely distributed throughout the aquatic systems of the entire Amazon and other large rivers of South America. They prefer to inhabit small streams and channels characterized by dense aquatic vegetation. During the rainy season, these fish can migrate to flooded areas. They can also be found in coastal zones and river deltas flowing into the ocean, which explains their ability to tolerate brackish water. In their natural habitat, their diet consists of various worms, small crustaceans, and insects.

This fish is peaceful and sociable. Thanks to its calm disposition and adaptability to various conditions, it is perfectly suited for keeping with other small and peaceful species. It is recommended to keep them in a school of at least 6 individuals.

These fish can successfully adapt to a wide range of water parameters: from slightly acidic to alkaline environments, and from soft to hard water. In some cases, for example, for the prevention of parasitic diseases, they can also tolerate brackish water. If it becomes necessary to salt the water, the concentration of marine salt should not exceed 2 grams per 10 liters. It is important to consider that salt can negatively affect beneficial bacterial colonies in the biological filter, which could potentially trigger a renewed nitrogen cycle, posing a danger to all aquarium organisms. To prevent such situations, it is recommended to use a powerful canister filter. Despite the additional cost, this is justified. However, if experiments with salinity are not planned, a simpler filter will suffice. Other necessary equipment includes a heater, a low-power lighting system, and an air pump. Aquarium decoration can be quite simple: several groups of plants planted along the back and side walls; shelters made of driftwood, grottoes, or twisted roots; river sand is used as substrate. Adding dried leaves will help give the water a light brown tint, characteristic of the fish's natural habitat. Leaves should be replaced every two weeks.

Pristellas are omnivorous and readily consume both dry commercial and live foods. An optimal diet for them may consist of high-quality flakes or pellets, supplemented with meaty foods (such as bloodworms, daphnia, mosquito larvae) once or twice a week.

Breeding this species is not very difficult, however, in small groups, difficulties may arise in choosing a suitable partner, as Pristellas are quite demanding in this aspect. Such problems do not occur when the school numbers 15–20 fish. For successful spawning, a separate tank should be prepared, which should replicate the conditions of the main aquarium, but with a smaller volume — 30–40 liters is quite sufficient. Spawning can be stimulated by adding meaty foods to their daily diet. As soon as a pair forms, the fish begin a courtship dance, circling each other. At this point, they should be transferred to a separate container. The female lays 300 to 400 eggs, from which fry emerge in approximately 24 hours. After spawning, the parents are immediately returned to the main aquarium to prevent them from eating the eggs and fry. The new offspring are fed micro-foods and Artemia.

This species is hardy and undemanding; health problems in a balanced aquarium usually do not arise. Only a sharp deterioration in keeping conditions or the introduction of an infected fish can provoke an outbreak of diseases. More detailed information on symptoms and treatment methods can be found in the "Aquarium Fish Diseases" section.

When selecting Pristella Tetras, pay attention to the overall activity of the school in the aquarium: healthy fish are constantly moving and show interest in their surroundings. Avoid individuals with signs of emaciation, fin damage, or whitish spots on the body, which may indicate the presence of infections. It is recommended to ask the seller to feed the fish before purchase to ensure there are no appetite problems. Purchase a group of 6 or more individuals, as solitary keeping causes severe stress in this species.