Royal Whiptail
Sturisomatichthys panamense
An elegant, twig-like catfish boasting extremely long caudal fin extensions. This regal herbivore gracefully rests on wood and aquarium glass, thriving in highly oxygenated, fast-flowing waters.
Water Temperature
22 - 27 °C
pH Value
6.5 - 7.5
Water type
Freshwater
Tank level
Middle
Adult size
20 cm
Minimum tank volume
>= 200 L
Minimum group
>= 1
GH
2 - 15 dGH
KH
3 - 10 dKH
TDS
60 - 325 ppm
Conductivity
94 - 508 uS/cm
Species description
Geographical Origin and Habitat: Present in Central America (Panama) and Northwestern South America (Colombia, Magdalena River basin). Prefers fast-flowing rivers and foothill streams, clinging to stones and polished branches in areas of turbulence.
Taxonomy and Morphology: Panamanian Royal Farlowella (Sturisomatichthys panamense). Astounding morphology, identical to a "dry twig". Extremely pointed snout with evident rostrum, soaring dorsal fin similar to a sail, long caudal filaments.
Social Behavior: Defenseless and totally peaceful fish. Unlike the usual "cleaners", Royal Farlowellas love to station on the aquarium glass, or in a perfectly vertical position hugging the filter or a soaring piece of wood.
Coloration and Sexual Dimorphism: Golden/beige background color crossed by two dark brown lateral stripes that unify the camouflage appearance. Adult males mature the famous hirsute bristles (odontodes) on the sides of the entire snout (the so-called "sideburns").
Care, breeding and tankmates
Aquarium Setup: A 100-120 cm (40-48 inches) tank. Strongly moved water. Long and smooth vertical woods and large Echinodorus leaves must be provided to allow them to rest in an upright position.
Diet and Feeding: Despite its "algae-eater" appearance, its diet is largely Omnivorous. Sustaining them only on algae equals malnutrition. Administer green bottom tablets and spirulina alternated with bloodworms, daphnia and brine shrimp.
Water Quality: Extremely sensitive to bacterial blooms (cloudy water). Requires rigorous mechanical filtration, well-oxygenated water and very frequent changes. The water must not be excessively hot (optimal range 22-26°C / 72-79°F).
Compatibility and Cohabitation: Unable to compete with large or violent benthic fish (Loaches, Crossocheilus, large Plecos). Golden match with quiet Corydoras (C. aeneus, C. sterbai), Discus or thick schools of small Tetras (Neons, Rummy-nose).
Aquarium Breeding: The male vigorously cleans the aquarium glass and pushes the female to lay 40-60 eggs on it in a vertical row. Then he stands vertically and guards, ventilating for 6 days. Brine shrimp nauplii and blended algae for the fry.
Risks and Diseases: Fry suffer a frightening 90% mortality in the first week if they cannot find adequate microfood. Adults at risk of starvation in turbulent or overcrowded aquariums.
Geographic Origin and Distribution
Present in Central America (Panama) and Northwestern South America (Colombia, Magdalena River basin). Prefers fast-flowing rivers and foothill streams, clinging to stones and polished branches in areas of turbulence.
Origin
Tropical oceans and reefsExtra-Amazon South AmericaCentral America and Caribbean
Fish profile
- Temperament
- Semi-aggressive
- Their temperament is extremely docile and unassuming, making them ideal for peaceful setups. They tend to mind their own business and completely ignore other species in the tank. Their gentle nature means they can easily be intimidated by overly aggressive or active tank mates.
- Diet
- Herbivore
- They are primarily herbivorous, feeding on algae, biofilm, and aufwuchs in their natural habitat. In captivity, they require a diet rich in vegetable matter, including algae wafers, blanched zucchini, and spinach. They will also accept small amounts of meaty foods, but their main intake should always remain plant-based.
- Life expectancy
- 8-12 years
- It has an average life expectancy between 8 and 12 years if kept in a suitable environment. As a fish sensitive to water purity, regular water changes and excellent filtration prevent debilitating diseases. A habitat rich in natural driftwood and free of stress contributes significantly to its longevity.
- Adult size
- 20 cm
- The catalog's scalar value is 20 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 26 cm for this species, recorded as standard length (SL). The taxonomic record consulted is Sturisomatichthys panamense (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
- They can be kept in pairs or small groups without significant issues. Males may occasionally display mild territorial behavior towards one another when defending a potential breeding site. Providing plenty of hiding spots and visual barriers ensures that multiple males can coexist peacefully.
- Feeding frequency
- Twice daily
- Because they graze continuously, they should be offered food regularly throughout the day. Providing vegetables that can be left in the tank for several hours allows them to eat at their own pace. Offering a fresh piece of vegetable before turning off the lights ensures they can feed overnight.
- Bioload
- The bioload produced by this species is moderate but constant due to its continuous grazing habits. They produce a steady stream of waste as they consume algae and plant matter throughout the day. A well-established biological filter and regular water changes are sufficient to manage their output.
- Flow
- Stagnant
- These catfish originate from flowing rivers and streams, so they appreciate moderate to high water flow. Good water movement and high oxygenation are crucial for their overall health and vitality. Powerheads or strong filter returns can be used to simulate their natural riverine environment effectively.
- Reproduction
- Oviparous
- Breeding is possible in captivity and typically occurs on flat, vertical surfaces like aquarium glass or large leaves. The male will diligently guard and clean the eggs until they hatch in about a week. Raising the fry can be challenging as they require a constant supply of very fine green food.
- Compatibility & tankmates
- This is a remarkably peaceful fish that makes a great addition to calm community tanks. They will not bother other inhabitants and prefer to be kept with similarly tranquil, non-aggressive species. Avoid housing them with boisterous or nippy fish that might outcompete them for food or cause them stress.
- Tank level
- Middle
- They are predominantly bottom and mid-level dwellers within the aquarium. Most of their time is spent resting on the substrate or clinging vertically to driftwood and glass. They rarely swim freely in the open water column unless moving to a new grazing spot.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Trophic level
- 2.4 ± 0.2 se
- Resilience
- Low (4.5 - 14 years)
- Phylogenetic uniqueness (PD50)
- 0.502
- Bayesian Length-Weight
- a = 0.00398, b = 3.11
- VulnerabilityLow vulnerability (22 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
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