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No federal permit to keepYunnanilus brevis
Yunnanilus brevis
Fishes › Carp, barbs, minnows, loaches (Cypriniformes) › Nemacheilidae (Stone loaches)
Petruichthys brevis, common name Inle loach, is one of two species of ray-finned fish in the genus Petruichthys, although some authorities place it in the genus Yunnanilus.
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 2.4 in / 6 cm).
- Water: Freshwater.
- Temperature: 72–75°F (range recorded for this species).
- Layout: Lives on or near the bottom: floor space and hiding places matter more than height.
- Availability: Rarely or never seen in the aquarium trade; expect to source it from specialists or not at all.
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 35 × 12 in (roughly 21 US gallons); space needed is rated “large tank”.
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 64–75 °F, pH 6–8, 3–15 dGH.
- Behaviour: temperament peaceful; 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: “Best maintained in a planted aquarium, and an excellent choice for the carefully-aquascaped set-up.”
- Diet: “Likely to be a micropredator feeding chiefly on small insects, worms, crustaceans, and other zooplankton in nature.”
- Tankmates: “Peaceful and likely to be intimidated or outcompeted for food by larger or more boisterous tankmates, although the presence of similarly-sized schooling fishes seems to help reduce its shyness.”
- Breeding: “This species has been bred in mature, heavily-decorated community aquaria.”
From the Seriously Fish profile for this species, which has the full habitat, maintenance, diet, behaviour and breeding write-up 167
Stone loaches
Applies to most species in this group. Habitat: Eurasian stone loaches include oxygen-rich stream dwellers such as Schistura and small Vietnamese river species such as the hovering zebra loach. [fg157-sumo, fg157-hover]. Individual species can differ, so compare with the species numbers above and the linked sources.
Housing & setup
- For Schistura balteata groups use a floor at least 90 × 30 cm (36 × 12 in).
- Build a stream layout with sand, rounded rocks and driftwood forming numerous caves and broken sight lines.
- Use strong filtration, aeration and some flow for Schistura; change 30–50% of water weekly.
- For hovering zebra loaches use at least 60 × 30 cm (24 × 12 in), dense plants and well-oxygenated but non-turbulent water.
- Introduce hovering zebra loaches only to a biologically mature aquarium; pH 6.0–7.5 and hardness 2–12 dGH suit both profiled species.
Climate & lighting
| Water | 71.6–78.8°F |
Diet
- Small live or frozen Daphnia and Artemia.
- Bloodworms for Schistura.
- Moina, microworms and Artemia nauplii for hovering zebra loaches.
- Appropriately sized dried foods alongside invertebrates, not as the sole Schistura diet.
Social life
- Schistura defend individual caves and can harass placid bottom dwellers; groups require territories. Hovering zebra loaches are peaceful and need at least 8–10 companions.
Health watch
- Territorial fin injuries in poorly structured Schistura tanks.
- Freshwater ich, a general aquarium risk.
- Stress-associated bacterial infections.
Understanding the animal
About this animal
About this animal
It is only found in Inle Lake and the adjacent He-Ho Plain in the Southern Shan States in Myanmar. It is a demersal fish which occurs in still and slow running waters as well as in a shallow lake, with dense submerged and floating vegetation.
Quoted from the Wikipedia article “Petruichthys brevis” (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, in rivers and streams, lakes. Stays near the bottom. Found in still and slow running waters. |
| Water it lives in | Freshwater, 72–75 °F (22–24 °C). |
| Climate | Tropical climate. |
What this means for care
- Keep water within its wild range, 72–75 °F.
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 | Petruichthys brevis, common name Inle loach, is one of two species of ray-finned fish in the genus Petruichthys, although some authorities place it in the genus Yunnanilus. It is only found in Inle Lake and the adjacent He-Ho Plain in the Southern Shan States in Myanmar. It is a demersal fish which occurs in still and slow running waters as well as in a shallow lake, with dense submerged and floating vegetation. — 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 |
| Biology | Found in still and slow running waters. Occurs in a shallow lake, with dense bottom and floating vegetation. — FishBase |
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. Fish in home aquariums often stay smaller than wild records.
Water temperature
Range the species tolerates in nature; aim for the middle.
pH
Water hardness
Minimum tank footprint
Seriously Fish recommends a tank base of at least 35 × 12 in (about 21 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: Schistura balteata Experienced keeper or breederAdded in the 2026 source-checked care-guide review.
- Seriously Fish: Micronemacheilus cruciatus (formerly Yunnanilus cruciatus) 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.
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