Betta renata

Adults grow up to 8 cm in length. These fish have a robust, elongated body. Their primary coloration consists of grey tones with small dark pigment spots, while the belly is usually light. The edge of the mouth is framed by a dark line. Males differ from females by their larger size and more developed, lush fins.

The natural habitat of this species is found in Southeast Asia, in the central and southern parts of Sumatra Island, specifically in the Indonesian provinces of Jambi and South Sumatra. Betta renata inhabits peat swamps, as well as associated streams and rivers located deep within the humid tropical rainforest. Sunlight barely penetrates the dense tree canopy, resulting in an almost complete absence of aquatic vegetation. Only along the banks can one find thickets of mosses and ferns. The bottom of these water bodies is entirely covered with decomposing organic materials: fallen leaves, tree branches, and various snags. The decomposition processes of plant remains lead to the release of humic acids and other tannins into the water, giving it a rich brown hue.

Although this species is classified as a fighting fish, in this case, it is merely a classification. Renata's Betta does not show aggression and is distinguished by its peaceful nature towards other aquarium inhabitants. Intraspecific relationships among males are built on principles of territorial dominance. Rivalry for hierarchy within the group is sometimes accompanied by displays of strength, but rarely leads to actual skirmishes.

The recommended aquarium volume for a pair or small group of these fish starts from 80 liters. Since Betta renata originates from tropical swamps, it would be very appropriate to recreate features of its natural environment in the aquascape. This means subdued lighting, plenty of driftwood on a dark substrate, possibly the addition of a few shade-loving plants, and a layer of fallen leaves from certain trees. The leaves will not only help form a water composition similar to their natural habitat but also become a basis for the development of colonies of beneficial microorganisms, such as paramecia, which can serve as a valuable additional food source for fry. Successful long-term keeping of Betta renata directly depends on the stability of water parameters within acceptable temperature and hydrochemical ranges. These fish require warm, acidic, and soft water, and tolerate excessive accumulation of organic waste, such as food remnants and excrement, poorly. The necessary stability is achieved through the uninterrupted operation of installed equipment and regular aquarium maintenance procedures. Among these, the most important is a weekly 15–20% water change with fresh water. The newly added water must match the pH and dGH values.

In their natural environment, these fish feed on zooplankton, as well as small aquatic insects, their larvae, and worms. Fish acclimated for sale generally adapt easily to a varied diet. Common aquarium foods, available in dry, frozen, or live forms, can form the basis of their daily diet. Many manufacturers produce special foods specifically designed for Bettas.

These fish have developed a unique adaptation to preserve their offspring in conditions of high competition. They do not lay eggs on the bottom or among plants, but instead brood them in their mouths, with the male taking on the responsibility for the eggs. During spawning, which is usually accompanied by a tight embrace where the fish wrap around each other, the eggs initially enter the mouths of both parents. However, after spawning, the female transfers them to her partner. The male then retreats to a secluded corner of the aquarium, away from other fish, while the female guards him from potential threats. The incubation period lasts from 17 to 20 days, after which fully formed fry emerge, capable of immediately consuming microscopic food, such as Artemia nauplii. It should be noted, however, that young males sometimes swallow eggs or release them prematurely if they are startled or under severe stress. Overall, breeding this species is quite straightforward, but the only difficulty lies in the survival of the fry, who require not only suitable food but also a warm, humid air layer above the water surface for the normal development of their labyrinth organ.

Most health problems in fish often arise from unsuitable keeping conditions. Maintaining a stable and comfortable habitat is a key factor for successful keeping. If symptoms of illness appear, the first step is to check the water quality. If deviations are found, it is important to take immediate measures to eliminate them. If the symptoms do not disappear or worsen, medicinal treatment may be required. More detailed information on symptoms and treatment methods can be found in the "Diseases of Aquarium Fish" section.

When choosing Betta renata, it should be considered that the species is rarely widely available and is often supplied as wild-caught. Inspect the fish for intact fins and the absence of whitish coatings or sores on the body, which may indicate bacterial infections developing due to transport stress. A healthy specimen should show curiosity, actively react to movement near the glass, and not exhibit signs of emaciation or a sunken belly. Avoid purchasing fish that constantly stay at the water surface, breathe heavily, or display lethargic behavior, as this may indicate impaired labyrinth organ function or intoxication from waste products in overcrowded retail tanks.