{"product_id":"erromyzon-sp-red-spots-red-diamond-loach-species-profile","title":"Erromyzon sp. “Red Spots” Red Diamond Loach Species Profile","description":"\u003cdiv\u003e— The “Ruby Hillstream Loach” of China’s Xijiang River Basin\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eI. Species Overview\u003c\/h2\u003e\n\u003cp\u003e← Back to \u003ca href=\"https:\/\/eiraaquatics.com\/collections\/loach\"\u003e\u003cstrong\u003e\u003cem data-end=\"1140\" data-start=\"1121\"\u003eLoach\u003c\/em\u003e\u003c\/strong\u003e\u003c\/a\u003e (genus overview)\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eErromyzon sp. “red spots”\u003c\/strong\u003e is an undescribed species within the family Gastromyzontidae, genus Erromyzon. The designation “sp.” indicates that it has not yet been formally described in scientific literature.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis small benthic native fish is endemic to the Xijiang River Basin in Guangxi, China. It is commonly referred to as the “\u003cstrong\u003eRed Diamond Loach\u003c\/strong\u003e” or “\u003cstrong\u003eRuby Hillstream Loach\u003c\/strong\u003e” due to the ruby-like red markings embedded along its flanks.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eAmong native fish enthusiasts, it is considered a highly sought-after ornamental species and serves as one of the representative benthic fishes of the Xijiang stream ecosystem. As its population size is closely tied to habitat integrity, it is regarded as an indicator species of stream ecological health.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eII. Coloration and Diagnostic Appearance (Key Identification Features)\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe ornamental value and identification of this species are primarily based on its distinctive coloration and pattern.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eOverall Base Color\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe body’s base color is dark brown to deep chestnut, closely resembling natural stream gravel. This camouflage provides effective concealment from predators in its native habitat.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eHead Pattern\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe head is covered with fine white reticulated or labyrinth-like markings. These form a striking contrast against the dark brown base, creating a layered, fissured visual effect. The pattern distribution is irregular, with slight variations among individuals—acting almost as a unique biological “fingerprint.”\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eFlank Markings\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe body sides display discontinuous vertical white interval bands rather than continuous horizontal stripes. Between the white bands and the brown base color, irregular bright red diamond- or rhomboid-shaped spots are embedded.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThese red markings are sharply delineated and vividly colored, appearing jewel-like under appropriate lighting. The common name “Red Diamond” originates from this feature, which is the primary distinguishing characteristic separating it from other species within the same genus.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eFin Characteristics\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe pectoral and pelvic fins are specialized into flattened adhesive discs formed through fin-ray fusion. The surface of the discs contains dense microstructures, providing extremely strong attachment capability that allows the fish to firmly adhere to rocks in fast-flowing currents.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe caudal fin is forked with transparent fin membranes. Fin rays show fine black-and-white speckling, lending an agile and graceful swimming posture.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eBody Form\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eAdult body length is approximately 6–7 cm. The anterior body is cylindrical, while the posterior portion is slightly laterally compressed. The abdomen is flattened. This streamlined morphology reduces resistance in strong currents and is highly adapted to benthic life in fast-flowing environments.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eIII. Distribution and Habitat\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eGeographic Distribution\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eWild populations are currently confirmed only in tributary mountain streams of the Xijiang River Basin in Guangxi, China, particularly in mountainous regions around Guigang and Wuzhou. It is a typical regional endemic species with a relatively narrow distribution range.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eHabitat Preference\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis species strictly prefers:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eClear water\u003c\/li\u003e\n\u003cli\u003eHigh dissolved oxygen levels\u003c\/li\u003e\n\u003cli\u003eFast-flowing shallow riffles\u003c\/li\u003e\n\u003cli\u003eGravel and rocky substrates\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eWater transparency in its native habitat typically reaches at least 1 meter. Its primary food source consists of periphytic algae (diatoms and green algae) growing on gravel surfaces. During the day, it adheres to smooth rock surfaces for feeding. At night, it retreats into crevices between stones to avoid predators.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eEnvironmental Sensitivity\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eIt is highly sensitive to water temperature and quality. Natural habitat parameters:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eTemperature: 18–28°C\u003c\/li\u003e\n\u003cli\u003epH: 6.5–7.5\u003c\/li\u003e\n\u003cli\u003eHardness: 8–12°dGH\u003c\/li\u003e\n\u003cli\u003eHigh dissolved oxygen\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eIt cannot tolerate turbid water, hypoxic conditions, or abrupt temperature fluctuations.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eIV. Closely Related Species\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eErromyzon sp. “red spots” belongs to the genus Erromyzon. Its closest relative is Erromyzon kalotaenia.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eBoth species:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eOccur primarily in Guangxi stream systems\u003c\/li\u003e\n\u003cli\u003eRequire clean, high-oxygen environments\u003c\/li\u003e\n\u003cli\u003eShow strong sensitivity to low oxygen\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eUnder hypoxic conditions, E. kalotaenia may lose adhesion and detach from glass surfaces due to oxygen stress. This stress response is highly similar in Erromyzon sp. “red spots.”\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eHowever, clear differences exist:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eE. kalotaenia exhibits black and white morphs.\u003c\/li\u003e\n\u003cli\u003eIts red markings may fluctuate or fade depending on environmental conditions.\u003c\/li\u003e\n\u003cli\u003eIt lacks the stable, bright red diamond-shaped markings characteristic of Erromyzon sp. “red spots.”\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThe presence of consistently vivid ruby-like rhomboid spots is the most reliable distinguishing feature.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eV. Captive Care Guidelines\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e1. Temperature and Water Management\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch4\u003eTemperature:\u003c\/h4\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eMaintain strictly between 18–28°C. In summer, use a chiller or cooling measures to prevent temperatures from exceeding 28°C, as high temperature reduces dissolved oxygen and may cause stress or mortality. In winter, maintain temperatures above 15°C using a heater.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch4\u003eWater Quality:\u003c\/h4\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eKey principle: high oxygen, low pollution.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003epH: 6.5–7.5\u003c\/li\u003e\n\u003cli\u003eAmmonia and nitrite: below 0.1 mg\/L\u003c\/li\u003e\n\u003cli\u003ePerform weekly water changes of 25–33%.\u003c\/li\u003e\n\u003cli\u003eReplacement water should be aerated for at least 24 hours, with temperature and pH matched to the tank water to avoid stress.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003e2. Feeding Management\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eIn the wild, this species primarily feeds on periphytic algae. In captivity, supplemental artificial feeding is generally unnecessary if sufficient green algae are available in the aquarium.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eEncourage natural algae growth by:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eProviding 4–6 hours of indirect light daily\u003c\/li\u003e\n\u003cli\u003eMaintaining stable water conditions\u003c\/li\u003e\n\u003cli\u003eEnsuring trace mineral availability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThis approach both satisfies nutritional requirements and replicates natural feeding behavior.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eVI. Aquarium Setup (Native Stream Biotope)\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eTank Size\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eMinimum 40 cm rectangular aquarium recommended. Width should ideally be ≥20 cm to allow proper flow and benthic movement. Avoid round tanks.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eSubstrate\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eUse 3–5 mm natural river pebbles or stream sand. Depth: 3–5 cm. Rinse thoroughly before use and remove sharp edges.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eHardscape (Rocks \u0026amp; Driftwood)\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eProvide multiple smooth, flat rocks to simulate riffle zones.\u003c\/li\u003e\n\u003cli\u003eCreate elevation differences to form fast-flow and slower-flow microhabitats.\u003c\/li\u003e\n\u003cli\u003eDriftwood may be added sparingly.\u003c\/li\u003e\n\u003cli\u003eAquatic plants are not necessary and may compete for algae resources.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eEquipment\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eWave maker to simulate natural current\u003c\/li\u003e\n\u003cli\u003eEfficient filtration system\u003c\/li\u003e\n\u003cli\u003eAdequate aeration\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eMaintaining stable flow and high dissolved oxygen is essential.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eVII. Tank Mates\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eSuitable Species\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eChoose small, peaceful native fishes with similar environmental requirements, such as:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMid-upper water column fish\u003c\/strong\u003e : 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.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHillstream Loach\u003c\/strong\u003e and \u003cstrong\u003eGoby\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eAvoid\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eAggressive fish (bettas, cichlids)\u003c\/li\u003e\n\u003cli\u003eLarge bottom-dwelling competitors\u003c\/li\u003e\n\u003cli\u003ePlecos (may attach to and harm them)\u003c\/li\u003e\n\u003cli\u003eHigh oxygen-demand fish (e.g., goldfish)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eVIII. Reproductive Behavior (Captive Observations)\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eArtificial breeding techniques remain underdeveloped. Observations suggest:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eBreeding season: late spring to early summer\u003c\/li\u003e\n\u003cli\u003eTemperature trigger: 20–24°C\u003c\/li\u003e\n\u003cli\u003eMales develop intensified coloration and defend rock crevices as spawning sites\u003c\/li\u003e\n\u003cli\u003eEggs are adhesive and deposited inside crevices\u003c\/li\u003e\n\u003cli\u003eMales guard eggs and fan them for oxygenation\u003c\/li\u003e\n\u003cli\u003eIncubation: 7–10 days\u003c\/li\u003e\n\u003cli\u003eAdults may prey on eggs or fry, so separating parents or using a breeding box is recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eIX. Health Management\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eCommon issues include:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eFin Rot\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eCause: Poor water quality (elevated ammonia\/nitrite) or physical injury\u003c\/li\u003e\n\u003cli\u003eTreatment: Water change (33%), slight temperature increase to 26°C, 0.3% non-iodized salt; half the recommended dosage of antibacterial medication if symptoms persist.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eIch (White Spot Disease)\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eCause: Sudden temperature drop or introduction of infected fish\u003c\/li\u003e\n\u003cli\u003eTreatment: Raise temperature to 28°C for 3–5 days; half the recommended dosage of ich medication if needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eSuction Disc Injury\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eCause: Sharp decor or aggression from tank mates\u003c\/li\u003e\n\u003cli\u003eTreatment: Isolate injured individuals in a clean, low-flow quarantine tank and add a mild antibacterial agent to prevent infection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003eX. Conservation Notes\u003c\/h2\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eAlthough not officially protected under national wildlife lists, wild populations are declining due to:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eHabitat destruction (stream damming, channelization)\u003c\/li\u003e\n\u003cli\u003eSand mining\u003c\/li\u003e\n\u003cli\u003eWater pollution\u003c\/li\u003e\n\u003cli\u003eInvasive species (e.g., armored catfish, mosquitofish)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eResponsible aquarists should:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003ePurchase captive-bred specimens from legitimate sources\u003c\/li\u003e\n\u003cli\u003eAvoid wild collection\u003c\/li\u003e\n\u003cli\u003eNever release captive-raised fish into natural water bodies\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003eAdditional Notes\u003c\/h3\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003eProper water quality and natural algae availability enhance coloration intensity.\u003c\/li\u003e\n\u003cli\u003eMild territorial “disc-pushing” interactions among adults are normal and require no intervention.\u003c\/li\u003e\n\u003cli\u003eAs this species remains undescribed scientifically, the name Erromyzon sp. “red spots” is used provisionally pending formal taxonomic publication.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Eira Aquatics","offers":[{"title":"Default Title","offer_id":46373455921341,"sku":null,"price":69.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7181\/5869\/files\/ezgif-frame-003_5dbedc13-70ea-4ee2-81c6-79fda22be67d.png?v=1770007340","url":"https:\/\/eiraaquatics.com\/products\/erromyzon-sp-red-spots-red-diamond-loach-species-profile","provider":"Eira Aquatics","version":"1.0","type":"link"}