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Panda loach
Yaoshania pachychilus
The famous panda loach, highly sought after for its striking black-and-white juvenile coloration. Requires cool, fast-flowing water and a continuous supply of algal biofilm.
Water Temperature
18 - 24 °C
pH Value
6.5 - 7.5
Water type
Freshwater
Tank level
Bottom
Adult size
6 cm
Minimum tank volume
>= 60 L
Minimum group
>= 1
GH
5 - 15 dGH
KH
2 - 7 dKH
TDS
95 - 295 ppm
Conductivity
148 - 461 uS/cm
Species description
Geographical Origin and Habitat: Endemic to mountain streams on Mount Yaoshan in Guangxi Province, China. Inhabits shallow headwaters characterized by crystal-clear, cold, torrent-like water flowing over smooth rocks and pebbles coated with thick biofilm.
Taxonomy and Morphology: Belongs to the family Gastromyzontidae, genus Yaoshania. Features a ventral flattening of the body, adapted to adhere to rocks in swift-flowing currents. Reaches a maximum length of about 5-6 centimeters.
Social Behavior: Peaceful and highly active during daylight hours. Prefers to live in groups of at least 5-6 individuals. The group will establish a loose social hierarchy marked by harmless chasing and display behavior that results in no physical injuries.
Coloration and Sexual Dimorphism: Juveniles display a striking, high-contrast black-and-white banded pattern (giving the name 'panda loach'). As they grow, this patterns fades into a mottled brown color. Sexual dimorphism is subtle; mature females are wider and heavier.
Care, breeding and tankmates
Aquarium Setup: Demands a specialized 'hillstream' setup with strong water currents generated by powerheads or manifold systems. The substrate must consist of fine sand and smooth river stones of various sizes. Robust plants like Anubias can be secured to rocks.
Diet and Feeding: Feeds primarily on biofilm, unicellular algae, and associated microorganisms grazed from rock surfaces. In captivity, feed spirulina wafers, powdered food, and supplement with small frozen foods (cyclops, daphnia, baby brine shrimp).
Water Quality: Very strict parameters: cool water between 15°C and 22°C (max 24°C in summer, chilling required if room is warm), pH 7.0-8.0, and medium hardness (GH 8-15). Dissolved oxygen levels near saturation are mandatory; keep nitrates very low.
Compatibility and Cohabitation: Best housed with species from the same geographic region that share similar water speed and temperature requirements, such as White Cloud Mountain Minnows (Tanichthys) or other gastromyzontid loaches. Avoid warm-water, slow, or aggressive fish.
Aquarium Breeding: Rare but documented. Spawning occurs in crevices between stones or by digging in gravel. Parents do not guard the eggs and may eat them. Fry require abundant mature biofilm and infusoria to survive.
Risks and Diseases: Highly vulnerable to low oxygen levels and high temperatures, which cause lethal respiratory distress in a matter of hours. Prone to skin bacterial infections if the substrate and water are not kept pristinely clean.
Geographic Origin and Distribution
Endemic to mountain streams on Mount Yaoshan in Guangxi Province, China. Inhabits shallow headwaters characterized by crystal-clear, cold, torrent-like water flowing over smooth rocks and pebbles coated with thick biofilm.
Origin
North AmericaEast Asia
Fish profile
- Temperament
- Semi-aggressive
- They possess an incredibly active, inquisitive, and sometimes comical temperament, constantly exploring their environment. They are highly social and rely on the presence of conspecifics to feel confident and exhibit their natural behaviors. While generally peaceful toward other species, their boisterous activity and intra-species squabbling can be overwhelming for shy or delicate tankmates. They establish a distinct pecking order, and harmless skirmishes to determine dominance are a normal and fascinating part of their behavior.
- Diet
- Omnivore
- They are enthusiastic micropredators and scavengers, requiring a varied diet rich in protein to thrive. A staple of high-quality sinking pellets or wafers is necessary to ensure the food reaches the bottom of the tank. They relish live and frozen foods such as bloodworms, daphnia, tubifex worms, and brine shrimp, which should be offered regularly. They are also known for their invaluable ability to hunt and eradicate pest snails in the aquarium.
- Life expectancy
- 4-8 years
- In the aquarium, the Panda Loach has an average lifespan ranging from 4 to 8 years when kept in a suitable environment. As a mountain stream fish, its longevity strictly depends on stable low temperatures and a very high concentration of dissolved oxygen. Unmitigated high summer temperatures can drastically shorten its lifespan in a matter of days due to respiratory distress. Proper feeding based on abundant biofilm and excellent substrate hygiene are fundamental to prevent premature bacterial infections.
- Adult size
- 6 cm
- The catalog's scalar value is 6 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 5.8 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Yaoshania pachychilus (v25.04); male or unsexed record. These figures are not interchangeable: the first is the profile's editorial reference, whereas the second is a published maximum under a specific measurement convention; differences among sources can reflect sex, population, life stage and measuring method.
- Sex ratio
- Pair
- There is no strict sex ratio required, as they do not form pairs and their social structure is based more on size and dominance than gender. Purchasing a group of juveniles naturally results in a mixed sex ratio, which is perfectly fine for their complex social interactions. The alpha individual in the group is often a large, robust female. Keeping a sufficiently large group is more important than worrying about the specific number of males versus females to prevent bullying.
- Feeding frequency
- Twice daily
- Feeding them one to two times daily with small portions is generally optimal for their metabolism. Because they are active mostly near the bottom, care must be taken to ensure that aggressive mid-water feeders do not consume all the food before it sinks. Providing sinking wafers right before turning out the lights can help ensure these sometimes nocturnal or crepuscular fish get enough to eat. Overfeeding should be avoided to maintain water quality, but their energetic foraging means they need consistent nutrition.
- Bioload
- This loach has a moderate bioload, producing typical waste levels for a bottom-dwelling omnivore of its size. Because they often sift through the substrate and uproot fine detritus, they require good mechanical filtration to keep the water clear. Regular vacuuming of the substrate during water changes is essential to prevent the accumulation of organic matter where they spend most of their time. Excellent biological filtration is also required to maintain zero ammonia and nitrite, as they are highly sensitive to poor water quality.
- Flow
- Stagnant
- Originating from flowing rivers and streams, they have a distinct preference for moderately strong water flow and high dissolved oxygen levels. The use of a powerhead, wavemaker, or a high-capacity canister filter can simulate their natural environment and encourage healthy activity. Strong circulation helps to keep the bottom of the tank free of stagnant areas where debris might accumulate. While they enjoy current, it is also important to provide sheltered areas among rocks and driftwood where they can rest.
- Reproduction
- Oviparous
- Breeding this species in the home aquarium is exceptionally rare and poorly documented, with most specimens in the trade being wild-caught or hormonally bred on commercial farms. They are believed to be egg scatterers that migrate to flooded areas or specific river zones to spawn during the rainy season. Replicating these complex seasonal changes, including fluctuations in water chemistry and temperature, is difficult for hobbyists. There are no reliable reports of spontaneous spawning occurring in standard community setups.
- Compatibility & tankmates
- They are generally social and active bottom dwellers, making them suitable for community tanks with fish that occupy the middle and upper levels. It is highly recommended to keep them in groups of at least five or six, as they are gregarious and establish a complex social hierarchy. If kept in too small a group, they can become withdrawn or excessively nippy toward other species. Avoid housing them with slow-moving or long-finned fish, as their boisterous nature can cause stress to more delicate tankmates.
- Tank level
- Bottom
- They are quintessential bottom dwellers, spending almost all of their time navigating the substrate, searching for food among the gravel and decor. They love to wedge themselves into tight crevices in rocks, driftwood, or PVC pipes to rest and feel secure. Occasionally, they may swim up the sides of the glass or engage in rapid, frantic swimming across the middle levels, particularly when playing or anticipating food. A soft, sandy substrate is strongly recommended to protect their delicate sensory barbels as they forage.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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