Home / Fishes / Carp, barbs, minnows, loaches / Cobitidae / Kuhli loach
No federal permit to keepKuhli loach
Pangio kuhlii
Fishes › Carp, barbs, minnows, loaches (Cypriniformes) › Cobitidae (Spined loaches)
The true Kuhli loach (Pangio kuhlii), which can be used synonymously with "coolie" loach, occasionally referred to as eel loach, is a small eel-like freshwater fish belonging to the loach family (Cobitidae).
Care at a glance
Species-specific aquarium care
- Tank: At least 24 in long and 12 in front to back for one adult (adults commonly reach about 4.7 in / 12 cm).
- Water: Freshwater.
- Temperature: 75–86°F (range recorded for this species).
- pH: 5.5–6.5.
- Hardness: 0–5 dGH.
- Layout: Lives on or near the bottom: floor space and hiding places matter more than height.
Calculated from this species' own FishBase record: tank size from its typical adult length and swimming zone, water values from its recorded ranges. The group guide below fills in general care.
Care guide
Species care notes
- Tank: a base of at least 24 × 12 in (roughly 14 US gallons); space needed is rated “modest tank”.
- Water: soft, acidic water, 70–79 °F, pH 3.5–7, 0–8 dGH.
- Behaviour: a shoaling fish best kept in a group of six or more; suited to a community tank.
- Difficulty: Easy (Seriously Fish rating).
Short excerpts from the species profile:
- Setup: “Use a soft, sandy substrate since this species likes to dig and tends to spend some of its time completely buried.”
- Diet: “Chiefly a micropredator sifting mouthfuls of substrate through the mouth and gills from which insect larvae, small crustaceans and suchlike are extracted with a proportion of the natural diet also likely to comprise organic detritus and plant material from…”
- Breeding: “Several vague reports exist but none are supported by solid information or photographs.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Spined loaches
Applies to most species in this group. Habitat: Spined loaches inhabit freshwater bottoms from tropical Pangio forest streams and swamps to temperate weather-loach streams, wetlands and paddy fields. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- For Pangio semicincta, provide at least a 60 × 30 cm (24 × 12 in) footprint; adult Misgurnus anguillicaudatus need at least 120 × 45 cm (48 × 18 in).
- Use soft sand for burrowing; coarse gravel can injure fish and inhibit feeding.
- Provide shaded retreats beneath secured wood or smooth rocks, with leaf litter and low-light plants for Pangio.
- Cover the aquarium securely and protect filter intakes against entry by small loaches.
- Use mature biological filtration, gentle circulation and surface agitation rather than strong flow for Pangio and weather loaches.
Climate & lighting
| Water | 70–79°F |
Diet
- Sinking complete foods reaching the bottom.
- Live or frozen Daphnia and Artemia.
- Bloodworms and small worms as part of a varied diet.
Social life
- Keep Pangio in groups of at least five or six with peaceful companions. Weather loaches can be kept singly but appear more active with conspecifics; they may eat eggs, fry or tiny fish.
Health watch
- Skin injuries and feeding impairment from unsuitable burrowing substrate.
- Ammonia-related illness in immature aquaria.
- Nutritional deficiencies if bottom dwellers receive insufficient suitable food.
Understanding the animal
About this animal
About this animal
They originate from the island of Java in Indonesia. This serpentine, worm-shaped creature is very slender and nocturnal.
Quoted from the Wikipedia article “Kuhli loach” (CC BY-SA 4.0) 174
In the wild
In the wild
From this species’ own FishBase record (habitat, bottom type, water and breeding data), not its family. Good care copies these conditions.1
| Where it lives | Lives in freshwater. Stays near the bottom. Lives in hill streams to lowland forest canals and peats. |
| Water it lives in | Freshwater, 75–86 °F (24–30 °C), pH 5.5–6.5, hardness 5 dH. |
| Climate | Tropical climate. |
| Behavior to plan for | Breeding: open water/substratum egg scatterers. |
What this means for care
- Keep water within its wild range, 75–86 °F.
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 89°F (up to 91°F in the hottest sampled areas) |
| Cool-season lows | about 72°F (down to 71°F in the coldest sampled areas) |
| Average temperature | 79–81°F across sampled records |
| Relative humidity | 79–83% on average (driest month about 77%) |
| Rainfall | about 2449 mm a year, spread fairly evenly |
Measured at 17 wild occurrence records sampled against WorldClim 2.1 climate data (1970–2000 averages). Air conditions in the range are ecological context, not enclosure settings: microhabitats such as burrows, leaf litter or basking rocks can be cooler, warmer or more humid.
From the sources
From the sources
Quoted from the matching sections of reputable sources for this exact species. Specialist databases are used first; Wikipedia (community-edited, CC BY-SA 4.0) only fills gaps. Other sources are short credited quotes.
| Overview | The true Kuhli loach (Pangio kuhlii), which can be used synonymously with "coolie" loach, occasionally referred to as eel loach, is a small eel-like freshwater fish belonging to the loach family (Cobitidae). They originate from the island of Java in Indonesia. This serpentine, worm-shaped creature is very slender and nocturnal. Its distinctive orange-pink coloration with triangular black stripes and long lifespan makes it a popular aquarium species. — Wikipedia (community-edited) |
| Where it lives | Home ranges Population dynamics Growth parameters Max. ages / sizes Length-weight rel. Length-frequencies Mass conversion Recruitment Abundance Life cycle Reproduction Maturity Maturity/Gills rel. — FishBase |
| Reproduction | Distinct pairing during breeding. — FishBase |
| Appearance and size | The kuhli loach is an eel-shaped fish with slightly compressed sides (Anguilliform body structure), four pairs of barbels around the mouth, and very small fins. The dorsal fin starts behind the middle of the body, and the anal fin well behind this. The eyes are covered with transparent skin. — Wikipedia (community-edited) |
| Biology | Facultative air-breathing; Adults live in hill streams to lowland forest canals and peats. Migratory behaviour is undetermined. Well known in aquarium trades as "Kuhli's loach". — FishBase |
| History and naming | The kuhli loach was originally described as Cobitis kuhlii by Achille Valenciennes in 1846 to commemorate Heinrich Kuhl's work as a naturalist and zoologist. In scientific literature, it has been referred to as Acanthophthalmus kuhlii. The genus name Acanthophthalmus is a junior synonym of Pangio. — Wikipedia (community-edited) |
Data and studies
The numbers
The numbers
Each bar is what one source reports. Where several sources weigh in, the dashed gold band marks their average.
Adult length
Maximum recorded length. Measured as total length. Fish in home aquariums often stay smaller than wild records.
Water temperature
Range the species tolerates in nature; aim for the middle.
Water hardness
Minimum tank footprint
Seriously Fish recommends a tank base of at least 24 × 12 in (about 14 US gallons).
Sources for this sheet
- FishBase (Froese & Pauly, eds.), version 24.07 Peer-reviewed researchThe global scientific database on fishes, maintained by a consortium of research institutions; every value is referenced.
- Seriously Fish species profiles Experienced keeper or breederLong-running aquarium reference written and peer-checked by experienced fishkeepers and ichthyologists; each profile covers habitat, tank size, water, diet, behaviour and breeding.
- Seriously Fish — pangio semicincta Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Seriously Fish — misgurnus anguillicaudatus Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Merck Veterinary Manual — Disorders and Diseases of Fish Zoo, university or veterinaryAdded in the 2026 source-checked care-guide review.
- Wikipedia (species article) Community referenceFree encyclopedia; useful overviews with their own citations. Intro text is quoted under CC BY-SA 4.0.
- iNaturalist (captive observations) Community referenceCommunity observation platform run by the California Academy of Sciences and National Geographic; observations marked captive show animals living in homes, zoos and aquariums.
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