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Betta splendens, also called Female Betta, refers to the female form of the Siamese fighting fish. This form is widely available in the aquarium trade and is generally considered very common, matching a rarity level of one. More discreet than many selectively bred males, it remains an active and inquisitive fish that can breathe atmospheric air through its labyrinth organ. Proper care still requires attention to temperament, warm water and calm access to the surface. Dense plants, shelters and clean water support its well-being and help reduce tension with tank mates. A thoughtfully arranged aquarium is more important than simply choosing a small container.

General species description

Betta splendens is the female form of Betta splendens, a small freshwater fish in the family Osphronemidae. The species is valued for its relative hardiness, observant behavior and the wide range of colors and fin forms produced in captivity. Females usually have shorter fins than males, although modern breeding lines may produce females with noticeably developed fins. They may also display vertical bars or stress markings depending on their condition and surroundings. Despite its small size, this species is territorial, so keeping several females together is not automatically peaceful. A well-planted aquarium with gentle filtration and limited current is essential for comfort and stable behavior.

Geographic origin and habitat

Betta splendens is native to the central plains of Thailand and nearby areas of Cambodia, Laos and Vietnam. Indonesia is more closely associated with the production and distribution of captive-bred fish than with the species’ main natural range. In the wild, it inhabits shallow, slow or still waters such as rice fields, ditches, temporary pools, marshes and small canals. The water may be brownish or lightly tea-colored, rich in plant debris and relatively low in dissolved oxygen, conditions to which its labyrinth organ is well adapted. Emergent and submerged vegetation provides shelter, shade and visual barriers between individuals.

Precise location and local name

The historical range of the species is centered in the Chao Phraya Basin and the wet lowlands of central Thailand, with regional occurrence in neighboring basins of former Indochina. Its traditional Thai name is pla kat, commonly translated as fighting fish. In Indonesia, it is called ikan cupang, a name widely used by aquarists and in the ornamental fish trade. The English name Siamese fighting fish refers to the former name of Thailand, Siam. In stores, Female Betta simply identifies a female of the species; it is not a scientific name and does not represent a separate taxonomic variety.

Appearance and physical characteristics

Betta splendens has an elongated, laterally compressed body with prominent unpaired fins. Captive-bred forms may be red, blue, turquoise, opaque, marbled or multicolored. Females generally have shorter fins and a somewhat deeper body than males, although these differences vary among strains. A small white spot near the pelvic fins may be the ovipositor, especially in mature females. Vertical bars can appear during courtship or spawning-related behavior. Like other bettas, the species has a specialized labyrinth organ and must be able to reach the water surface regularly. This does not replace the need for clean, properly conditioned water.

General diet

Betta splendens is primarily carnivorous and naturally consumes small aquatic and terrestrial invertebrates, including insect larvae and tiny crustaceans. In an aquarium, a high-quality betta-specific pellet can form the staple diet, supplemented with frozen foods such as bloodworms, brine shrimp or daphnia. Live foods may encourage natural hunting behavior, but they should come from a reliable source. Offer small portions once or twice daily and remove uneaten food. Overfeeding can lead to obesity and digestive problems; an occasional fasting day may suit some healthy adults. Variety and moderation are more useful than feeding large amounts.

Essential data

• Native river name: Chao Phraya, within the historical range
• Local name used: pla kat in Thai; ikan cupang in Indonesian
• Origin of the scientific name: Betta is the genus name; splendens is the species epithet assigned to the fish
• Full-name etymology: Betta is thought to be connected with a regional vernacular name; splendens means bright or shining in Latin
• Common/vernacular names: Siamese fighting fish, betta, Female Betta
• Family: Osphronemidae
• Subfamily: Macropodinae
• Name pronunciation: BET-ta SPLEN-denz
• Discovery: described by George Albert Boulenger? Not used; the species is generally attributed to George Albert Boulenger in 1909?
• Maximum adult size: about 7 cm
• Water temperature and pH: 24 to 30 °C; approximately pH 6.0 to 8.0
• Stream appearance and surrounding vegetation: shallow, still water often stained by leaves, with dense vegetation and floating plants
• Typical tank mates: Boraras brigittae, Trigonostigma heteromorpha and peaceful snails, depending on tank size and the betta’s temperament
• Temperament and behavior: territorial, inquisitive and often best kept alone; females may also fight with one another
• Water depth: shallow, often only several tens of centimeters in natural habitats
• Sexual dimorphism: females are generally deeper-bodied, with shorter fins and a visible ovipositor; males are often more slender with more developed fins
• Bottom structure and flow: mud, silt, plant debris and roots; very low flow to stagnant water

In your aquarium

Success with Betta splendens depends on warm, stable and well-maintained water rather than on keeping it in an unstructured container. Provide gentle flow, plants or shelters and a lid that helps maintain warm air above the surface. Tank mates must be assessed individually because a female is not necessarily peaceful with other females. A moderate animal-based diet, regular water changes and careful acclimation support long-term health. Since the species is extremely common in the aquarium hobby, choose a fish that is alert, feeding well, free of damaged fins and breathing normally. Stable conditions and visual cover are key to reducing stress.