Home / Fishes / Carp, barbs, minnows, loaches / Nemacheilidae / Dwarf Zipper Loach
No federal permit to keepDwarf Zipper Loach
Paracanthocobitis zonalternans
Fishes › Carp, barbs, minnows, loaches (Cypriniformes) › Nemacheilidae (Stone loaches)
Paracanthocobitis zonalternans also known as the dwarf zipper loach is a species of ray-finned fish in the genus Paracanthocobitis.
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 4.8 in / 12.2 cm).
- Water: Freshwater.
- Temperature: 75–79°F (range recorded for this species).
- pH: 6.8–7.8.
- Hardness: 8–18 dGH.
- 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 24 × 12 in (roughly 14 US gallons); space needed is rated “modest tank”.
- Water: a fairly wide range, from slightly acidic to slightly alkaline, 68–77 °F, pH 6–7.5, 2–10 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: “Will do well in most well-maintained aquaria provided sufficient cover is available, and should not harm softer-leaved plants.”
- Diet: “Probably a micropredator feeding on insect larvae and suchlike in nature.”
- Tankmates: “Among the more peaceful members of the genus and an excellent addition to communities of small, stream-dwelling fishes.”
- Breeding: “Several successes have now been recorded but the first was by UK aquarist Mick Wright who obtained his specimens from fellow fishkeeper Andy Rushworth.”
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
This species is known from Bangladesh, Myanmar, Thailand, and peninsular Malaysia. It is found in the Brahmaputra, Meghna, Irrawaddy, Sittang, Salween, Maeklong, and drainages in peninsular Thailand and Malaysia.
Quoted from the Wikipedia article “Paracanthocobitis zonalternans” (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. Found in a variety of streams from river mainstreams to small brooks. Apparently avoids mountain streams with steep gradient and prefer shallow riffles over small pebbles above which its marmorated color pattern makes it inconspicuous from the surface. Also collected on a muddy to sandy substrate with a few stones and numerous gastropod shells in depths ranging from 0.05 to 0.5 m. |
| Water it lives in | Freshwater, 75–79 °F (24–26 °C), pH 6.8–7.8, hardness 8–18 dH. |
| Climate | Tropical climate. |
What this means for care
- Keep water within its wild range, 75–79 °F.
Native climate (measured)
Native climate (measured)
| Warm-season highs | about 94°F (up to 98°F in the hottest sampled areas) |
| Cool-season lows | about 56°F (down to 50°F in the coldest sampled areas) |
| Average temperature | 76–79°F across sampled records |
| Relative humidity | 73–77% on average (driest month about 60%) |
| Rainfall | about 2079 mm a year, with strong wet and dry seasons |
Measured at 18 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 | Paracanthocobitis zonalternans also known as the dwarf zipper loach is a species of ray-finned fish in the genus Paracanthocobitis. This species is known from Bangladesh, Myanmar, Thailand, and peninsular Malaysia. It is found in the Brahmaputra, Meghna, Irrawaddy, Sittang, Salween, Maeklong, and drainages in peninsular Thailand and Malaysia. The range extends from northern Myanmar to peninsular Malaysia. — 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 a variety of streams from river mainstreams to small brooks. Apparently avoids mountain streams with steep gradient and prefer shallow riffles over small pebbles above which its marmorated color pattern makes it inconspicuous from the surface. Also collected on a muddy to sandy substrate with a few stones and numerous gastropod shells in depths ranging from 0.05 to 0.5 m. — 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.
Typical adult weight
Average adult body mass in each database (FishBase gives the maximum recorded weight).
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.
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: 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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