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Leporacanthicus triactis — Three Beacon Pleco (L091)

Three Beacon Pleco (L091)

Leporacanthicus triactis

The striking L091 'Three Beacon', so called for the bright orange spots on the dorsal, caudal, and adipose fins that contrast with the brown-black body.

Water Temperature

25 - 29 °C

pH Value

6 - 7.4

Water type

Freshwater

Tank level

Bottom

Adult size

25 cm

Minimum tank volume

>= 300 L

Minimum group

>= 1

GH

2 - 12 dGH

KH

2 - 10 dKH

TDS

50 - 280 ppm

Conductivity

78 - 438 uS/cm

Species description

Geographical Origin and Habitat: Originating from the Orinoco River basin (Venezuela). Lives in the high-flow sections and rapids of the river, hiding among polished granite boulders or in the thick of logs wedged under the powerful water jet.
Taxonomy and Morphology: Three-beacon Pleco (L091 / Leporacanthicus triactis). Known for the three conspicuous colored "beacons" on its fins. Possesses the typical elongated snout and massive needle-like maxillary teeth of the "Vampire Plecos", useful for feeding on invertebrates.
Social Behavior: Strongly territorial nocturnal fish. Will not hesitate to aggressively defend its main den against other loricariids or bottom-dwelling fish. Tends to be more visible if reassured by numerous dark hiding places.
Coloration and Sexual Dimorphism: Chocolate brown to charcoal black body. The distinguishing feature is the three intense yellow or bright orange spots (beacons), located on the tip of the dorsal fin and on the lobes of the caudal fin. Males with a more angular head and large odontodes.

Care, breeding and tankmates

Aquarium Setup: Demands huge tanks (at least 120-150 cm / 48-60 inches). Fundamental to recreate a rheophilic river: powerful water currents, oversized filtration, large ceramic tubes for dens, and round boulders. No sharp gravel that would injure its soft belly.
Diet and Feeding: Predominantly carnivorous. In nature, it extracts snails and invertebrates. In the aquarium, feed it after lights out with whole clams, shelled shrimp, protein pellets for bottom fish, and occasional pieces of vegetables.
Water Quality: Very oxygenated, warm (25-29°C / 77-84°F), and pristine water. Fish of the genus Leporacanthicus are exceptionally intolerant to accumulations of nitrogenous waste (nitrates); massive and frequent water changes are mandatory.
Compatibility and Cohabitation: Ideal for tanks with robust mid-water Cichlids (Severum, Geophagus, Uaru) or large South American characins. Avoid coexistence with small bottom fish that could be injured during nocturnal territorial disputes.
Aquarium Breeding: Occurs in captivity in large caves. The male traps the female, fertilizes the huge yellow eggs, and cares for them by fanning them for weeks until the fry's yolk sac is absorbed.
Risks and Diseases: Lack of oxygen or insufficient filtration will quickly lead to asphyxia or severe fungal infections on the fins. It has a tendency to fatally wedge itself in rocks with holes that are too narrow.

Geographic origin and distribution

Originating from the Orinoco River basin (Venezuela). Lives in the high-flow sections and rapids of the river, hiding among polished granite boulders or in the thick of logs wedged under the powerful water jet.

Origin

Amazon, Orinoco, and Guianas

Fish profile

Temperament
Semi-aggressive
They are highly territorial over their caves. Aggression is directed at similar species. Otherwise, they ignore mid-water fish.
Diet
Carnivore
Leporacanthicus triactis requires a meaty diet. Feed it sinking carnivore pellets. Fresh vegetables can be offered occasionally.
Life expectancy
8-15 years
Adult size
25 cm
Sex ratio
Flexible
Keep one male per tank. Multiple females can be kept. Males are very territorial.
Feeding frequency
Twice daily
Feed them once a day. Nighttime feeding is preferred. Remove uneaten food promptly.
Bioload
High
Leporacanthicus triactis generates a high bioload. This is due to its size and diet. Strong filtration is required.
Flow
Stagnant
This species thrives in strong water flow. Good oxygenation is essential. Use powerheads to simulate natural rivers.
Jump risk
No
Reproduction
Oviparous
Breeding in captivity is difficult. They are cave spawners. The male guards the eggs.
Compatibility & tankmates
With caution
It is peaceful with top-dwelling fish. It can be aggressive to other bottom dwellers. Keep it as the only pleco.
Tank level
Bottom
Leporacanthicus triactis is a bottom-dwelling fish. It needs plenty of hiding spots. Driftwood and caves are necessary.

Scientific Parameters & Models

FishBase

Window to the official scientific data of the species

FishBase v25.04Data synced on: 06/15/2026
Resilience
Medium (1.4 - 4.4 years)
Phylogenetic uniqueness (PD50)
0.5625
Bayesian Length-Weight
a = 0.01549, b = 2.96
VulnerabilityLow vulnerability (20 / 100)