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Beaufortia pingi — Species Profile

← Back to Loach (genus overview)

Beaufortia pingi is a refined and understated native loach from the mountain streams of southwestern China.
A soft band of emerald green crosses the mid-body, framed by dark vertical markings at the head and tail, while tiger-like stripes seal its silhouette at the caudal peduncle.
Often mistaken for the “Green Zebra Loach,” the true Bing’s Hillstream Loach is defined by a unique pattern: dark above, dark below, and a single band of green across the center — a living piece of stream camouflage resting quietly on stone.

I. Basic Information

• Common Name: Bing’s Hillstream Loach

• Chinese Name: 秉氏爬岩鳅

• Scientific Name: Beaufortia pingi

• Family: Balitoridae

• Genus: Beaufortia

• Native Range: Mountain streams along the Yunnan–Guangxi border, China

• Maximum Length: 6–7 cm

• Lifespan: 4–5 years under proper care

• Conservation Status: Chinese endemic species; generally protected under fisheries regulations due to strict water quality requirements

II. Natural Habitat

• Forest-shaded mountain brooks and hillside streams

• Substrate of smooth bedrock, slate, and rounded stones, free of silt

• Water temperature: 16–24°C (short-term summer tolerance up to 26°C)

• Crystal-clear water with consistently high dissolved oxygen

• pH 6.5–7.2; soft to moderately soft water

👉 This species is a strict indicator of clean, oxygen-rich stream ecosystems.

III. Morphology and Identification

The pectoral and pelvic fins are modified into powerful suction discs, allowing the fish to anchor firmly to rock surfaces in flowing water.

Key diagnostic pattern features:

• Base coloration grey-white to pale yellow-brown

• Body covered with vertical black bands

• A wide emerald to blue-green zone across the mid-body, extending over one-third of total length

• This green band interrupts the black striping pattern at the center of the body

• Head and anterior region retain broken black vertical bars

• Dorsal and ventral margins continue black striping above and below the green zone

• Tail region shows 4–6 bold, continuous black vertical bars, the most stable identifying feature

Fin characteristics (critical identification point):

• Pectoral, pelvic, and caudal fins edged with pure white translucent margins

• No blue or blue-white gradient present

• The white edging provides high contrast against dark stone backgrounds

All black markings are solid pigment bands; pale regions represent the true ground color.

Distinction from the “Green Zebra” Hillstream Loach

IV. Temperament and Behavior

• Strictly benthic and stone-attached lifestyle

• Mostly inactive during bright daylight; activity increases at dawn and dusk

• Primary feeding by grazing algae and biofilm

• Completely non-aggressive; suitable for group keeping

• Locomotion by fin-assisted crawling and short tail hops

💡 An excellent biological indicator of water quality and ecological stability.

V. Care Difficulty and Suitable Keepers

• Care Level: ★★★☆☆ (Moderately demanding)

Best suited for:

• Aquarists experienced with hillstream or cold-water systems

• Keepers able to maintain temperatures below 28°C long term

• Setups providing strong oxygenation and clean substrates

Not recommended for:

• Beginners

• Warm-climate tanks without temperature control

Primary causes of failure:

• Chronic high temperature

• Organic accumulation in substrate

• Insufficient flow or oxygen

• Inappropriate high-protein feeding

✅ Success formula:
Temperature ≤28°C + High oxygen + Pre-algae-conditioned stones

VI. Aquarium Care Guidelines

1. Tank Size

• Single or pair: 40 cm tank minimum

• Small group (3–5): 60 cm or larger preferred

• Priority on bottom area and stone surface rather than depth

2. Water Parameters

3. Tank Setup

• Substrate: Fine river sand (1–2 mm), 2–3 cm depth

• Hardscape: Extensive smooth rocks and slate, pre-conditioned with algae

• Lighting: Moderate intensity, 6–8 hours daily

• Flow: Directional outlets toward bottom to form slow circulation

💡 Algae-covered stones = permanent natural feeding stations.

VII. Diet and Feeding

• Primary diet: Natural biofilm and algae

Supplementary foods:

• Sinking spirulina wafers

• Spirulina paste

• Blanched spinach (pesticide-free)

Avoid:

• Bloodworms and tubifex

• High-protein carnivorous feeds

• Floating pellets

• Feeding frequency: Small amounts every other day

VIII. Tankmate Principles

Bing’s Hillstream Loach is a peaceful benthic species with no territorial aggression.

Compatibility principles:

• Similar temperature and water requirements

• No competition for rock surfaces

• Non-aggressive behavior

👉 In properly designed hillstream aquaria, it can be combined freely with most gentle stream species.

IX. Conservation and Ethics

• Narrow-range endemic species of southwestern China

• Extremely sensitive to pollution and oxygen depletion

• Listed as generally protected under Chinese fisheries law

Choose responsibly sourced individuals and avoid wild-caught specimens.
Field observation should follow the principle: observe, photograph, and leave undisturbed.

X. Summary

The beauty of Beaufortia pingi lies in ordered contrast:

Grey stone-toned body traced with ink-black bands,
A single emerald ribbon across the flank,
And a tiger-striped tail sealing its signature.

It does not dazzle. It endures.
Anchored to stone, grazing quietly,
Preserving the rhythm of a mountain stream
Within the glass walls of an aquarium.

Beaufortia virgata (Green Zebra Loach) Encyclopedia

Beaufortia virgata, commonly known as the Green Zebra Loach, is a freshwater hillstream loach endemic to China.

← Back to Loach (genus overview)

Taxonomy
Order: Cypriniformes
Family: Gastromyzontidae
Genus: Beaufortia

The species was formally described in 2024 by the research team led by Professor Tang Wenqiao of Shanghai Ocean University and published in Zoological Systematics and Evolution.

As a benthic fish specialized for fast-flowing streams, B. virgata inhabits clear, high-oxygen mountain waters and exhibits strong habitat dependence. Although not nationally protected, its restricted distribution and fragile habitat make it a species of conservation concern.

Adults reach 5–8 cm in length and possess both ornamental and research value. Captive maintenance requires simulation of a high-flow, high-oxygen environment, making it moderately demanding for inexperienced aquarists.

I. Morphological Characteristics

Beaufortia virgata exhibits pronounced specialization for rheophilic life.

The body is strongly dorsoventrally flattened. The head and abdomen allow firm adhesion to rock surfaces. Pectoral and pelvic fins form a suction disc structure supported by thickened fin rays, enabling stability in strong current.

The mouth is inferior and adapted for scraping algae and biofilm. Eyes are dorsally positioned. The species is scaleless, and its mucus layer reduces friction while enhancing camouflage.

The lateral line is complete and well developed, functioning in flow detection.

II. Coloration and Geographic Variation

The defining ornamental feature is its green base coloration combined with zebra-like transverse striping.

Healthy adults display a deep green tone with cyan iridescence under optimal conditions. The body bears irregular transverse black bands approximately 2–3 mm wide, creating strong contrast.

Geographic variation occurs:

• Guangxi populations: 6–8 bands with wider spacing

• Yunnan populations: 10–12 narrower bands with stronger contrast

The abdomen is pale yellowish without markings, forming a natural gradient.

III. Distribution and Habitat

Beaufortia virgata is endemic to karst mountain streams along the Guangxi–Yunnan border within the Pearl River basin.

Due to geographic isolation, populations exhibit limited gene flow and regional variation.

Native Habitat Characteristics

1. Water Flow and Dissolved Oxygen
   Prefers riffles with dissolved oxygen ≥ 8 mg/L and current velocity of approximately 0.3–0.8 m/s.

2. Water Quality
   pH 6.5–7.5; hardness 5–15 °dGH; ammonia and nitrite near zero.

3. Temperature
   Natural range 14–24 °C; rarely exceeds 27 °C.

4. Substrate
   Smooth gravel (3–10 mm) covered with algae and biofilm.

IV. Similar Species Identification

1. Beaufortia kweichowensis
   Brown base coloration without green tone; irregular spots instead of transverse bands.

2. Sinogastromyzon pingi
   Longitudinal striping pattern; slimmer body; prefers slower flow.

V. Artificial Breeding Guide

Water Management

Maintain temperature at 18–24 °C (optimal 20–22 °C) with minimal fluctuation. Ensure dissolved oxygen ≥ 7 mg/L.

Weekly 25–30% water changes are recommended.

Feeding

A benthic algivorous grazer, feeding primarily on attached algae and biofilm. Supplement sparingly with spirulina-based sinking feed if necessary.

VI. Reproduction

Wild reproduction is presumed to occur from April to June at 22–26 °C.

Eggs are adhesive and deposited on rock surfaces in flowing water. Artificial breeding remains experimental.

VII. Health Management

As a scaleless species, it is sensitive to medication. Preventive care and stable water conditions are critical. Emphasis should be placed on water quality and oxygenation before pharmaceutical treatment.

VIII. Conservation Status and Ethical Keeping

Although not nationally protected, habitat degradation poses risk.

Key ethical principles:

• Prefer captive-bred individuals

• Avoid wild collection

• Do not release captive fish into natural systems

IX. Taxonomic Background

Molecular analysis revealed approximately 5.20% genetic divergence from related congeners, supporting species recognition. The epithet virgata refers to its striped pattern.

Species Overview -Pseudogastromyzon laticeps

← Back to Loach (genus overview)

Revered by native fish enthusiasts as “the purple-winged spirit of eastern Guangdong streams,” the Broad-headed Hillstream Loach is distinguished by its extremely flattened, rock-hugging body, powerful adhesive ability, and the mysterious violet sheen that appears along the fin margins during the breeding season. Among China’s endemic small benthic fishes, it stands as a truly unique species.

I. Basic Information (Species Overview)

Common Name: Broad-headed Hillstream Loach
Other Names: Purple-finned Hillstream Loach, Eastern Guangdong Purple-fin Loach
English Name: Purple-finned Hillstream Loach (non-official, hobbyist usage)
Scientific Name: Pseudogastromyzon laticeps Chen & Zheng, 1980
Family: Balitoridae
Genus: Pseudogastromyzon
Native Range: Independent coastal mountain streams of eastern Guangdong Province, China
Maximum Length: 5–6 cm (males slightly larger than females)
Lifespan: Approximately 4–5 years under proper captive care
Conservation Status: Not listed as a protected species, but considered a narrow-range endemic with vulnerable wild populations

II. Natural Distribution and Native Habitat

1. Geographic Distribution

This species is strictly limited to eastern Guangdong’s coastal mountain drainages, including:

• Dapeng Peninsula, Shenzhen (e.g., Qiniang Mountain, Paiya Mountain streams)

• Lianhua Mountain area, Huizhou

• Haifeng and Luhe regions, Shanwei

• Phoenix Mountain and selected tributaries in Chaozhou and Raoping

It does not occur in the Pearl River main system, Xijiang, or Beijiang rivers.
Geographic isolation from other Pseudogastromyzon species is pronounced.

2. Native Habitat Characteristics

• Water Type: Small headwater streams, mountain brooks, shallow runs below waterfalls

• Flow: Alternating gentle to fast currents, consistently high oxygen levels (>6 mg/L)

• Substrate: Smooth bedrock, slate, and rounded cobbles; minimal silt

• Temperature: 12–22°C (summer temperatures may briefly reach 26°C under forest shade)

• Water Chemistry: Clear water, pH 6.5–7.2, soft water (GH 2–5 dGH)

👉 These conditions indicate that the species favors clean, oxygen-rich environments, but does not require extreme torrent conditions at all times.

III. Morphology and Sexual Dimorphism

1. General Morphology

• Body extremely dorsoventrally flattened, oval “suction-disc” profile

• Broad head (the origin of the common name “broad-headed”) with rounded snout

• Inferior mouth with well-developed adhesive structures

• Base coloration ranges from brown to olive green with irregular dark blotches

• Fins semi-transparent, showing metallic blue-violet iridescence at certain angles

2. Secondary Sexual Characteristics (Pronounced in Males)

• Thickened and elongated first rays of pectoral and pelvic fins

• Distinct purple-red to blue-violet coloration along dorsal and caudal fin margins

• Fine white nuptial tubercles on the snout and head

• Increased contrast of body markings

3. Sex Identification (Adults)

IV. Temperament and Behavior

• Activity Level: Moderate; primarily slow crawling and short hops between stones

• Locomotion: “Walking” with pectoral fins combined with tail flicks; poor sustained swimmer

• Territoriality: Low to moderate; males defend small rock surfaces during breeding

• Aggression: Extremely low; strictly non-predatory

• Daily Rhythm: Primarily diurnal, but most active at dawn and dusk

💡 This species functions as a micro-ecosystem engineer, grazing biofilm and maintaining clean rock surfaces.

V. Care Difficulty and Suitable Keepers

Care Level: ★★★☆☆ (Moderately difficult)

Best suited for:

• Experienced aquarists familiar with coldwater or hillstream systems

• Keepers able to provide stable low temperatures and high oxygenation

• Hobbyists interested in observing benthic behavior and ecological interactions

Not recommended for:

• Beginners

• Aquarists without temperature control in warm climates

⚠️ Primary causes of failure: prolonged temperatures above 26°C, organic buildup in substrate, and inappropriate high-protein feeding.

VI. Aquarium Care Guidelines

1. Aquarium Size

• Minimum: 40 cm tank for one individual or a small group (2–3 fish)

• Ideal: 60 cm or larger for groups of 4 or more

Key principle: prioritize horizontal footprint and bottom area rather than depth.

2. Water Parameters

3. Tank Setup

Substrate:

• Fine sand or small gravel to simulate natural streambeds

• Bare-bottom setups acceptable if ample hard surfaces are provided

Hardscape:

• Extensive use of smooth rocks, slate, or river stones is essential

• Stones should form crevices and undersides for shelter and spawning

• Driftwood may be added sparingly

Filtration:

• Efficient filtration (canister or strong hang-on-back) to maintain clarity and oxygenation

Water Flow:

• Powerheads or directional outlets recommended to create gentle to moderate flow

• While extreme current is not mandatory, flow improves feeding efficiency, activity, and overall vitality

VII. Diet and Feeding

1. Natural Diet

• Diatoms and green algae

• Biofilm and aufwuchs

• Microscopic invertebrates (rotifers, copepods)

2. Captive Feeding Recommendations

Staple Foods:

• High-quality sinking algae wafers

• Naturally grown algae on tank surfaces (ideal)

Supplementary Foods:

• Finely crushed frozen mysis shrimp

• Spirulina paste

• Blanched spinach leaves (pesticide-free)

Avoid:

• High-protein carnivorous foods (bloodworms, tubifex)

• Floating pellets

💡 Feeding is most effective in the evening or after lights-out.

VIII. Tankmate Compatibility (Important)

✅ Suitable Tankmates

• Long-finned Minnows (Opsariichthys spp.)

• Chinese Minnows (Zacco spp.)

• Gobies (Rhinogobius giurinus)

• Other gentle benthic species such as Panda Loaches

❌ Unsuitable Tankmates

• Suckermouth catfish (e.g., plecos) — competition and physical stress

• Aggressive cichlids or bettas

• Overcrowded community tanks

📌 Key principle: avoid competition for bottom space and ensure compatible temperature and water requirements.

IX. Breeding Behavior

1. Reproductive Characteristics

• Breeding Season: Spring to early summer (18–21°C, often linked to rainfall)

• Courtship: Males display purple fins and guide females toward spawning sites

• Spawning Sites: Undersides of rocks or crevices

• Parental Care: Limited guarding by males; less intense than in Opsariichthys

2. Breeding Challenges

• Highly sensitive to water quality fluctuations

• Eggs require good water movement to prevent fungal growth

• Fry are difficult to raise, requiring microalgae and rotifers

👉 Most specimens in the trade originate from professional captive breeding programs.

X. Common Issues and Important Notes

• Heat sensitivity: prolonged exposure above 26°C causes metabolic stress; >28°C may be fatal

• Substrate hygiene: organic buildup can lead to fin rot

• Seasonal availability: best acquired in spring or autumn

• Ethical considerations:

  • A narrow-range endemic species

  • Avoid wild collection

  • Observe responsibly and never remove individuals from nature

XI. Summary: Who Should Keep This Species?

The Broad-headed Hillstream Loach is not a “utility fish,” but rather:

• A living ambassador of mountain stream ecosystems

• A silent indicator of water quality

• A low-key yet striking purple-winged dancer

It does not demand roaring torrents—but it does ask for cool, clean water and stones it can call home.

Myers’ Hillstream Loach

Scientific name: Pseudogastromyzon myersi Herre, 1932

Taxonomic Classification

Kingdom: Animalia
Phylum: Chordata
Class: Osteichthyes
Order: Cypriniformes
Family: Gastromyzontidae
Genus: Pseudogastromyzon
Species: Pseudogastromyzon myersi

← Back to Loach (genus overview)

Pseudogastromyzon myersi is a Chinese endemic freshwater species. Owing to its bright golden fins edged with fine red margins during peak coloration, it has become a highly sought-after species among native hillstream fish enthusiasts and is regarded as a relatively localized but well-known species of the genus among native fish enthusiasts.

This profile covers taxonomy, morphology, coloration, distribution, habitat ecology, species differentiation, husbandry, and conservation considerations.

I. Species Overview

Pseudogastromyzon myersi has no recognized subspecies. Within the genus, it is considered a relatively localized but well-known species among native fish keepers.

Although it is not currently listed as a nationally protected species in China, localized wild populations have declined in certain areas due to habitat degradation, hydraulic engineering, and historical wild collection.

Most specimens in the aquarium trade today are captive-bred. Wild populations should be strictly protected to prevent further decline.

II. Morphology and Coloration

Adult size typically ranges from 5–7 cm. The body is dorsoventrally flattened, an adaptation to fast-flowing mountain streams.

1. Body Structure

The body is compact and moderately broad, with balanced body height and width. Compared with P. fangi, the dorsal tubercles on the snout are finer and denser. The caudal peduncle is short and sturdy, but the overall body appears lighter and less robust than that of P. fangi.

The mouth is modified into a ventral adhesive disc. Although relatively small, it provides strong suction for clinging to rocks in fast currents. The species is scaleless, with a thick mucus layer that reduces friction and enhances protection. Eyes are dorsolateral and small. The dorsal fin is rounded at the edge, and the caudal fin is obliquely truncated.

2. Coloration and Pattern

The primary ornamental feature lies in its fin coloration.

Fins:
During peak coloration (commonly in spring and autumn under optimal water conditions), the dorsal, pectoral, and pelvic fins display a bright golden-yellow tone. The dorsal fin typically shows a golden inner area with a distinct narrow red margin along the outer edge. In some individuals, faint red edging may also appear on the pectoral and pelvic fins.

Notably, there is no black margin, which helps distinguish it from certain congeners such as P. fangi.

Outside peak coloration, the fins fade to pale gold and the red edging becomes less pronounced, though the yellow base remains visible.

Body coloration:
The base color is usually yellowish-brown, occasionally grayish. The flanks are covered with fine, irregular dark speckles forming a “dots anteriorly, short bars posteriorly” pattern. Compared with P. fangi, the spots are generally smaller and denser.

III. Distribution and Natural Habitat

1. Geographic Distribution

Pseudogastromyzon myersi has a relatively concentrated distribution centered in southern China. It occurs primarily within the Pearl River drainage system, including tributaries of the Bei Jiang, Xi Jiang, and Dong Jiang systems.

It is native to mountain streams of Guangdong and parts of Guangxi Province. Within suitable habitats—clear, fast-flowing streams—it can be locally common.

2. Natural Habitat Characteristics

This species inhabits upper-stream mountain sections with strong current.

Water flow:
Moderate to strong current (approximately 0.3–0.7 m/s), typically in shallow riffle zones.

Water chemistry:
pH 6.0–7.2 (slightly acidic to neutral)
Hardness 4–10 °dGH
Dissolved oxygen ≥ 7 mg/L
Extremely low ammonia and nitrite

It is more sensitive to water quality fluctuations than P. fangi.

Substrate:
Smooth gravel 2–8 mm in diameter, often coated with biofilm and algae.

Temperature:
Natural range 13–23 °C
Suitable captive range: 19–26 °C
Long-term exposure above 28 °C should be strictly avoided.

Sudden temperature shifts may trigger stress responses.

IV. Similar Species and Identification

The most easily confused species is Pseudogastromyzon changtingensis.

Key diagnostic differences:

1. Fin coloration (most visible):
   P. myersi — golden base with fine red margin, no black edging
   P. changtingensis — orange-yellow fins with thick black margins

2. Body pattern:
   P. myersi — fine, dense speckles; anterior dots transitioning to posterior bars
   P. changtingensis — longitudinally aligned markings, denser head spotting

3. Body form:
   P. myersi — compact and moderately broad
   P. changtingensis — slimmer and more elongated

4. Distribution:
   P. myersi — Pearl River drainage
   P. changtingensis — restricted to Changting, Fujian

V. Aquarium Setup

A hillstream-style aquarium is essential.

Minimum tank size: 40 × 25 × 30 cm
For groups of five or more: 60 cm length recommended.

Use 2–8 mm natural river gravel (3–5 cm depth). Avoid fine sand, which may clog the adhesive disc.

Arrange smooth rocks to create flow breaks and hiding crevices. All sharp edges should be removed, as this species is scaleless and sensitive to abrasion.

Limited use of flow-tolerant plants such as moss or Anubias is acceptable, provided water circulation remains unobstructed.

VI. Water Parameters

Temperature: 19–26 °C (optimal range for coloration and health)
Strictly avoid long-term exposure above 28 °C

pH: 6.0–7.2
Hardness: 4–10 °dGH
Dissolved oxygen: ≥ 7 mg/L

Weekly water changes of 25–30% are recommended, ensuring temperature difference does not exceed 2 °C.

Stable parameters are critical due to the species’ high sensitivity.

VII. Feeding and Tankmates

P. myersi is primarily herbivorous, grazing on algae and biofilm.

Provide 8–10 hours of moderate lighting to promote natural algae growth. Supplement 2–3 times weekly with spirulina wafers or plant-based sinking pellets if necessary.

High-protein foods such as bloodworms or brine shrimp should be avoided to prevent digestive disorders.

Suitable tankmates include:

• Small peaceful hillstream gobies

• Other compatible hillstream loaches

• Various stream loaches

• Small native mid-water species

• Freshwater shrimp species

Avoid aggressive fish, large bottom-dwelling species, and warm slow-water species.

VIII. Reproduction

In the wild, spawning typically occurs from April to June when water temperatures reach 21–25 °C and dissolved oxygen levels are high (≥ 8 mg/L).

Eggs are deposited on smooth stones in high-flow zones. There is no parental care.

Captive breeding remains rare and technically challenging.

IX. Health Management

As a scaleless species, P. myersi is highly sensitive to medication.

Common issues include:

• Ich (treated via gradual temperature elevation and increased aeration)

• Enteritis from improper diet

• Secondary infections from abrasion

Preventive care and water stability are more effective than aggressive treatment.

X. Conservation and Ethical Keeping

Although not legally protected, the species’ restricted distribution makes it ecologically vulnerable.

Aquarists should:

• Prefer captive-bred individuals

• Avoid wild collection

• Never release captive fish into natural waterways

• Promote awareness of native freshwater conservation

Responsible husbandry contributes to long-term preservation of native hillstream biodiversity.

I. Sinogastromyzon szechuanensis Species Overview

Taxonomic Classification

• Class: Osteichthyes
• Subclass: Actinopterygii
• Order: Cypriniformes
• Family: Homalopteridae
• Genus: Sinogastromyzon

Key Information

• Type locality: Sichuan Province, China.
• Conservation status: Listed on the IUCN Red List. Not included in China’s national protected wildlife list, but local populations show decline due to habitat degradation.
• Core identity: An endemic small-sized rheophilic benthic fish of the upper Yangtze River basin. Recognized for its specialized adhesive pelvic disc and primitive stream-adapted morphology, it is valued in native river aquaria as an efficient natural algae grazer.

II. Morphological Characteristics

1. Basic Size

• Adult size: Typically 8–10 cm; smaller individuals (5–7 cm) occur in juvenile stages or certain populations.

2. Body Structure

• Body dorsoventrally flattened, width greater than height
• Anterior body strongly depressed; caudal peduncle slightly compressed
• Head short and flattened
• Snout rounded; snout fold divided into lobes with two pairs of rostral barbels
• Two pairs of maxillary barbels

3. Specialized Organs

• Pelvic fins completely fused into a powerful adhesive disc
• Pectoral fins expanded laterally; origin positioned anterior to the eyes
• Caudal fin emarginate, lower lobe slightly longer

4. Scales and Coloration

• Body covered with small scales; head and fin bases partially naked
• Base coloration dark brown to chocolate-brown with irregular dorsal blotches and lateral mottling
• Fins yellowish to light brown with scattered spots
• Ventral side pale cream
• No distinct breeding coloration phase

5. Additional Features

• Inferior mouth with keratinized lower jaw edge
• Well-developed labial papillae
• Gill openings extend ventrally for improved respiration in strong current
• Anal fin with two unbranched rays

III. Distribution

1. Primary Distribution

• Upper Yangtze (Jinsha River section)
• Min River
• Jialing River
• Yalong River
• Chishui River
• Wu River
• Qing River

2. Additional Occurrences

• Reported in parts of Gansu Province and Chongqing Municipality (dominant in certain reaches of the Qijiang River).

3. Habitat

• Strictly limited to upstream torrent zones with shallow, fast-flowing riffles.
• Geographic range is narrow and habitat-specific.

IV. Ecology and Behavior

• Spends most of its life attached to rocks in strong current; moves via short crawling or hopping motions rather than sustained swimming
• Non-territorial; individuals are loosely distributed
• Highly dependent on strong flow, high dissolved oxygen, and low pollution levels
• Cold-tolerant (down to ~10°C), but heat-sensitive

V. Feeding Ecology (Algae-Grazing Function)

1. Main Diet

• Diatoms
• Filamentous green algae
• Brown algae
• Biofilm

2. Supplementary Diet

• Aquatic insect larvae (e.g., chironomid larvae)
• Small benthic invertebrates
• Organic detritus

3. Captive Feeding Note

• In mature aquaria with established biofilm and algae growth, supplemental feeding is unnecessary.
• Overfeeding artificial food is discouraged to prevent water deterioration and preserve natural foraging behavior.

VI. Captive Care: Tank Setup

1. Minimum Recommended Size

• ≥ 40 × 30 cm (length × width) to ensure adequate water flow and activity space.

2. Substrate

• Smooth rounded stones (2–5 cm diameter)
• Avoid fine sand (may clog adhesive disc) or sharp gravel (risk of injury)

3. Equipment

• Strong adjustable wave pump to simulate natural torrent conditions
• Efficient filtration system
• Dissolved oxygen requirement: ≥ 8 mg/L

4. Aquascape

• Prioritize open flow paths.
• Dense aquatic plants are unnecessary (rare in natural habitat) and may obstruct current.
• Small patches of moss attached to rocks are acceptable as decorative elements.

VII. Water Parameters

1. Temperature

• Optimal: 16–26°C
• Short-term tolerance: Up to 28°C (not sustainable long-term)
• Prolonged exposure above 28°C strictly contraindicated (risk of hypoxia and stress)
• Winter care: Cold-tolerant down to ~10°C; no heating required in temperate climates

2. Water Quality

• pH: 6.5–7.8
• Hardness: 8–12 °dGH
• Extremely sensitive to ammonia and nitrite; maintain crystal-clear water with no detectable pollutants

3. Water Change Routine

• Weekly water change: 30–40%
• New water must be dechlorinated and temperature-matched (≤ 2°C difference)
• Avoid frequent large water changes to maintain stability

VIII. Tankmates and Stocking Density

1. Suitable Tankmates

• Hillstream loaches (e.g., Beaufortia kweichowensis)
• Rheophilic gobies (e.g., Rhinogobius duospilus)
• Other Sinogastromyzon species

2. Species to Avoid

• Slow-water species (e.g., Micronemacheilus pulcher, Rhodeus spp.)
• Aggressive fish
• Large plecos (compete for algae and may attack resting individuals)
• Highly competitive feeders

3. Stocking Density

• 40 × 30 cm tank: 4–5 individuals (species-only); maximum 8 total if mixed with other rheophilic species
• 60 × 40 cm tank: 6–8 individuals (species-only); maximum 12 total if mixed with other rheophilic species
• Core principle: Avoid overcrowding. Sufficient attachment surfaces and algae resources are essential for health.

IX. Reproduction

1. Spawning Season

• Late spring (May) when water temperature rises to 18–20°C.

2. Spawning Behavior

• Spawns exclusively in gravel beds of fast-flowing water
• Females deposit adhesive eggs on smooth rock surfaces or in crevices
• Males fertilize eggs through chasing behavior; no parental care
• Eggs are pale yellow, adhesive, and approximately 1.85 mm in diameter

3. Early Development

• Incubation period: ~22 hours and 34 minutes at 26.3–27.8°C
• Newly hatched larvae: ~4.39 mm in total length with 37 myomeres
• Yolk sac absorption: Completed by day 4 (starts exogenous feeding on algae)
• Juvenile stage: Scales fully developed by day 65

4. Captive Breeding

• Artificial fertilization has been successfully documented, but large-scale breeding programs are not currently available.
• Most specimens in the aquarium trade are wild-caught.

X. Conservation and Ethical Considerations

1. Major Threats

• Dam construction (blocks migration and spawning routes; destroys torrent habitats)
• Agricultural runoff (pollutes water, kills algae, and degrades food sources)
• Over-collection for the aquarium trade (causes significant local population declines)

2. Ethical Recommendations

• Prioritize captive-bred specimens when available (reduces pressure on wild populations)
• Never release captive individuals into non-native waters (risks genetic contamination or ecological disruption)
• Support conservation of torrent habitats (e.g., opposing unregulated river modification)
• Promote awareness of the species’ conservation status among aquarists

I. Species Overview

← Back to Loach (genus overview)

II. Coloration and Diagnostic Appearance (Key Identification Features)

Overall Base Color

Head Pattern

Flank Markings

Fin Characteristics

Body Form

III. Distribution and Habitat

Geographic Distribution

Habitat Preference

• Clear water
• High dissolved oxygen levels
• Fast-flowing shallow riffles
• Gravel and rocky substrates

Environmental Sensitivity

• Temperature: 18–28°C
• pH: 6.5–7.5
• Hardness: 8–12°dGH
• High dissolved oxygen

IV. Closely Related Species

• Occur primarily in Guangxi stream systems
• Require clean, high-oxygen environments
• Show strong sensitivity to low oxygen

• E. kalotaenia exhibits black and white morphs.
• Its red markings may fluctuate or fade depending on environmental conditions.
• It lacks the stable, bright red diamond-shaped markings characteristic of Erromyzon sp. “red spots.”

V. Captive Care Guidelines

1. Temperature and Water Management

Temperature:

Water Quality:

• pH: 6.5–7.5
• Ammonia and nitrite: below 0.1 mg/L
• Perform weekly water changes of 25–33%.
• Replacement water should be aerated for at least 24 hours, with temperature and pH matched to the tank water to avoid stress.

2. Feeding Management

• Providing 4–6 hours of indirect light daily
• Maintaining stable water conditions
• Ensuring trace mineral availability

VI. Aquarium Setup (Native Stream Biotope)

Tank Size

Substrate

Hardscape (Rocks & Driftwood)

• Provide multiple smooth, flat rocks to simulate riffle zones.
• Create elevation differences to form fast-flow and slower-flow microhabitats.
• Driftwood may be added sparingly.
• Aquatic plants are not necessary and may compete for algae resources.

Equipment

• Wave maker to simulate natural current
• Efficient filtration system
• Adequate aeration

VII. Tank Mates

Suitable Species

• Mid-upper water column fish : Peaceful species that occupy the mid and upper layers of the aquarium (avoiding the benthic zone where the loach resides), ensuring no overlap in ecological niches and maintaining a harmonious tank environment.
• Hillstream Loach and Goby
  

Avoid

• Aggressive fish (bettas, cichlids)
• Large bottom-dwelling competitors
• Plecos (may attach to and harm them)
• High oxygen-demand fish (e.g., goldfish)

VIII. Reproductive Behavior (Captive Observations)

• Breeding season: late spring to early summer
• Temperature trigger: 20–24°C
• Males develop intensified coloration and defend rock crevices as spawning sites
• Eggs are adhesive and deposited inside crevices
• Males guard eggs and fan them for oxygenation
• Incubation: 7–10 days
• Adults may prey on eggs or fry, so separating parents or using a breeding box is recommended.

IX. Health Management

Fin Rot

• Cause: Poor water quality (elevated ammonia/nitrite) or physical injury
• Treatment: Water change (33%), slight temperature increase to 26°C, 0.3% non-iodized salt; half the recommended dosage of antibacterial medication if symptoms persist.

Ich (White Spot Disease)

• Cause: Sudden temperature drop or introduction of infected fish
• Treatment: Raise temperature to 28°C for 3–5 days; half the recommended dosage of ich medication if needed.

Suction Disc Injury

• Cause: Sharp decor or aggression from tank mates
• Treatment: Isolate injured individuals in a clean, low-flow quarantine tank and add a mild antibacterial agent to prevent infection.

X. Conservation Notes

• Habitat destruction (stream damming, channelization)
• Sand mining
• Water pollution
• Invasive species (e.g., armored catfish, mosquitofish)

• Purchase captive-bred specimens from legitimate sources
• Avoid wild collection
• Never release captive-raised fish into natural water bodies

Additional Notes

• Proper water quality and natural algae availability enhance coloration intensity.
• Mild territorial “disc-pushing” interactions among adults are normal and require no intervention.
• As this species remains undescribed scientifically, the name Erromyzon sp. “red spots” is used provisionally pending formal taxonomic publication.