Kuhli loach

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Kuhli loach (Pangio kuhlii) is a slender, eel-like freshwater fish from Java, Indonesia. It’s popular in aquariums because of its distinctive orange-pink body with dark vertical stripes, long lifespan, and peaceful nature. The true kuhli loach is sometimes confused with similar Pangio species sold in the pet trade.

What it looks like
- Very slender, worm-like body with four pairs of barbels near the mouth.
- Orange-pink color with 10–15 dark brown to black vertical bars; the spaces between bars are lighter.
- Small fins; a spine under each eye that can help defend itself.
- Males aren’t easy to tell apart, but during breeding females look larger and may show greenish ovaries before spawning.

Size and life
- Grows to about 7 cm (2.75 inches) in length, with a maximum around 10 cm (4 inches).
- Can live 10–14 years in a good aquarium.

Habitat and behavior in the wild
- Native to shallow, slow-moving rivers with sandy bottoms and lots of leaf litter and plant cover.
- Nocturnal and social; they like to be in small groups and hide most of the day.
- They swim close to the bottom and can burrow into soft gravel or sand.

In the aquarium
- Best in planted tanks with plenty of hiding places (driftwood, rocks, dense plants).
- Keep in groups of 5 or more; they are shy and feel safer in bigger numbers.
- Prefer dim lighting and a calm environment; avoid sharp décor that could injure their barbels.
- Tank mates should be peaceful; good friends include most small, non-aggressive fish and shrimp.
- They are bottom feeders and will eat sinking pellets, flakes, frozen foods, and live foods like bloodworms.

Care and tank setup
- Water: tropical conditions; pH 5.5–6.5 (tolerates up to 7.0), hardness around 5 dGH, temperature 24–30 C (75–86 F).
- Feed at the bottom; if other fish eat everything, feed at night.
- Do weekly water changes to keep the tank clean and healthy.

Breeding
- Breeding in home aquariums is challenging and usually needs very stable water and many hiding spots.
- When successful, eggs are laid among plant roots; females may be larger with visible ovaries.
- Some breeders use hormones to induce spawning, but this is not common for hobbyists.

Conservation and origin
- IUCN status: Least Concern. Populations are not known to be in immediate danger, but data are limited.
- Potential threats include habitat loss from agriculture and palm oil plantations, pollution, and overcollection for the pet trade.
- Diseases can spread through the aquarium trade, so buying healthy fish from reputable sources helps.

Notes
- The term “kuhli loach” can refer to several closely related Pangio species, which look similar but are not exactly the same fish. The true kuhli loach is Pangio kuhlii from Java, Indonesia.