Betta persephone Care Guide - Aquarium Setup, Diet & Breeding

Betta persephone is a tiny, darkly coloured member of the betta group, often known as the peat swamp betta or black fighting fish. Mature males can show a deep black or charcoal body with blue-green iridescence and subtle red or copper highlights in the fins, producing a striking appearance under subdued lighting. Females are generally browner and less intensely marked.

This species is a labyrinth fish, so it can breathe atmospheric air as well as using its gills. Like other bettas, it may occasionally rise to the surface, display to rivals or investigate activity outside the aquarium, although its small size and secretive nature make it less conspicuous than Betta splendens.

In the wild, Betta persephone lives among submerged roots, fallen leaves and dense swamp vegetation in tea-coloured water. The water is typically very soft and strongly acidic, with tannins released by decaying wood and leaf litter. These habitats are often shaded by thick rainforest canopy and have little current.

Males are territorial and may fight with one another, while females can also be assertive in confined quarters. Its restricted natural range and habitat loss have made Betta persephone an important species for responsible captive breeding and conservation-minded fishkeeping.

Betta persephone comes from the peat-swamp forests of southern Peninsular Malaysia, especially the state of Johor, in Southeast Asia. It inhabits shallow, acidic blackwater pools and slow-moving swamp channels rich in leaf litter and submerged vegetation.

Allow at least 20 litres for a single fish, with around 30 litres or more for a compatible pair; a footprint of approximately 45 × 30 cm is preferable to a tall, narrow aquarium. Use a secure lid because bettas can jump, leave humid air above the water and provide gentle filtration with minimal current. Dark sand or fine, smooth substrate, dried catappa or other aquarium-safe leaves, peat-free botanical litter, driftwood, floating plants and dense areas of fine-leaved vegetation create the shaded, sheltered conditions this species prefers. Stable, very soft, acidic water and tannin coloration are desirable, but all natural materials should be aquarium-safe and carefully prepared.

Up to about 4 cm (1.6 inches) in total length; males are usually slightly larger and more robust than females.

Betta persephone is a small carnivore that feeds naturally on insect larvae, tiny aquatic invertebrates and other minute prey. Offer a varied diet of appropriately sized frozen or live foods such as daphnia, mosquito larvae, brine shrimp and grindal worms, supplemented with a high-quality small betta or micropellet food. Feed modest portions and remove uneaten food promptly, as this species has a small stomach and pristine water is especially important in its soft, acidic habitat.

A species aquarium is usually the safest choice, particularly for a male or a breeding pair. If a carefully monitored community setup is attempted, suitable companions may include very small, peaceful blackwater fish such as Boraras rasboras, small pencilfish and gentle freshwater shrimp, provided the aquarium is spacious and heavily planted. Avoid other bettas, fin-nipping fish, boisterous species and larger predators; males should not be housed together, and even females may need separating if aggression develops.

Betta persephone is a bubble-nesting species. Condition a compatible male and female with live or frozen foods, then introduce them in a densely furnished breeding aquarium with gentle flow and floating cover. The male builds a nest, embraces the female to collect the eggs and places them beneath the bubbles, where he guards them until they hatch. Remove the female after spawning if the male becomes aggressive, and remove the male once the fry are free-swimming. Feed the tiny fry with infusoria or other appropriately sized first foods before progressing to newly hatched brine shrimp.

Males are typically larger, darker and more vividly iridescent, with stronger blue-green or reddish fin markings and a more elongated profile. Females are usually smaller, browner and rounder-bodied, and may show a visible ovipositor when mature.