新月搏鱼 · Crescent Betta

Overview

The red crescent at the tail edge helps identify Betta imbellis, a bubble-nesting betta. Its peaceful-sounding name is not a guarantee of universal compatibility: some captive lines have been selected for aggression, and ornamental hybrids also occur. Stocking decisions must account for the actual fish and its provenance.

Distribution & habitat

It is thought native to southern Thailand, Peninsular Malaysia, and northern Sumatra. Introduced populations occur elsewhere, including Singapore. Still or slow rice-field waters, swamps, ditches, streams, and ponds provide habitat, often with abundant vegetation. Most populations are freshwater, while some inhabit coastal brackish swamps; that does not establish a salt requirement for every aquarium fish.

Aquarium setup

Provide a planted, shaded aquarium with plentiful surface cover. Tall stems, floating plants, lilies, wood, pots, and pipes can create retreats. Leaves add cover and microorganisms. Avoid strong circulation, secure the lid against jumping, and retain warm humid air above the water.

Diet & feeding

Aquatic and terrestrial invertebrates are probable natural prey. Dry foods are usually learned, but live or frozen water fleas, brine shrimp, and bloodworms should provide regular variety. Avoid overfeeding.

Behaviour & compatibility

A species aquarium or very peaceful companions are preferable. Multiple males can sometimes coexist with abundant cover, but isolating a pair is the more manageable breeding arrangement.

Sexual dimorphism

Adult males are more colorful with longer fins. Receptive females become paler and develop dark vertical bars.

Breeding

The male builds a nest in a sheltered tube, beneath a leaf, or among surface vegetation. Females need escape cover. Eggs released during embraces are moved into the foam. Adults can usually remain afterward while the male alone tends the brood. Eggs hatch in one or two days, followed by three or four more days in the nest. A threatened male may relocate the entire brood. Parents generally leave free-swimming young unharmed.

For the first few days, fry require infusoria-sized food before progressing to microworms and brine shrimp nauplii. Do not assume the larger first foods suitable for some mouthbrooders will work immediately here. Maintain humid air and regular small water changes, with dietary variety rather than excessive brine shrimp alone.

Notes

Ornamental hybridization and introductions threaten the genetic integrity of some wild populations. Keep locality and lineage information where known.