Long-nosed Distichodus
Distichodus lusosso
The pointed-snout cousin of the Six-Banded Distichodus. Retains the devastatingly destructive herbivorous nature (devours all plants) and boisterous, aggressive personality. Reaches 40-50 cm. Needs colossal tanks and huge tankmates.
Water Temperature
22 - 26 °C
pH Value
6.5 - 7.5
Water type
Freshwater
Tank level
Bottom and middle
Adult size
35 cm
Minimum tank volume
600 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: Congo River basin (Democratic Republic of the Congo and Republic of the Congo). Frequents the areas of the river with strong current, eroded banks and dense riparian vegetation to scrape.
Taxonomy and Morphology: Long-snout Distichodus (Distichodus lusosso). Large African characin. It has a high and laterally compressed body, but differs from D. sexfasciatus by its decidedly elongated snout ("beak-like") to reach crevices.
Social Behavior: As a juvenile it is a schooling fish, but with age it becomes distinctly asocial and belligerent towards its peers. Maintains a proud and majestic swimming; bites the fins of slow fish if annoyed.
Coloration and Sexual Dimorphism: Stunning juvenile livery: bright orange/gold background furrowed by neat black vertical bands, and blood red fins. As they grow the colors fade to a muddy green-brown, losing the red (a disappointment for many novices). No dimorphism.
Care, breeding and tankmates
Aquarium Setup: Will destroy EVERY plant (devours them). The setup must be based on large smooth pebbles, huge smooth logs and boundless space to swim. Tanks of 200 cm (80 inches, minimum 160 gallons). Mastodontic filtration required.
Diet and Feeding: Overwhelming vegetarian preference. Inherits the shape of the snout to graze on algae, roots and leaves. Devours lettuce, blanched spinach, zucchini and spirulina wafers. Supplement weekly with krill and earthworms. If it does not take vegetables it gets seriously ill.
Water Quality: Tolerates a wide range of conditions, but suffers from stagnation and excess nitrates, which lead to immediate darkening of the livery and apathy.
Compatibility and Cohabitation: Ideal companion for African "Monster Fish" aquariums: large river Cichlids, huge Synodontis, Polypterids (Bichirs) or large Mormyrids. Forbidden to pair fish smaller than 15 cm (6 inches) or with veil fins (will decimate them).
Aquarium Breeding: Never documented nor achieved in home captivity due to the massive size and the impossibility of making mature adults cohabit peacefully.
Risks and Diseases: The change of livery as an adult leads many owners to neglect or give it away. Sensitive to lethal intestinal blockages if fed exclusively with meat (beef heart, bloodworms) instead of vegetable fibers.
Geographic Origin and Distribution
Congo River basin (Democratic Republic of the Congo and Republic of the Congo). Frequents the areas of the river with strong current, eroded banks and dense riparian vegetation to scrape.
Origin
Africa and Madagascar
Fish profile
- Temperament
- Semi-aggressive
- The Longnose Distichodus is a boisterous, robust, and occasionally belligerent fish, especially as it reaches maturity. While not an outright killer, their sheer size and assertive feeding behavior can easily intimidate or stress smaller or more delicate tank mates. They are highly active and can sometimes exhibit territoriality toward similarly shaped or bottom-dwelling fish. They are an impressive showpiece fish that requires a specialized setup and an owner prepared for their immense size and destructive nature towards plants.
- Diet
- Omnivore
- They are omnivores with a very strong inclination toward herbivory, naturally grazing on aquatic vegetation and small invertebrates. A large portion of their captive diet must consist of vegetable matter, including spirulina wafers, blanched spinach, zucchini, and cucumber. This must be supplemented with high-quality meaty foods like bloodworms, chopped earthworms, prawns, and large sinking pellets. Failing to provide enough vegetable matter may result in nutritional deficiencies and increased aggression.
- Life expectancy
- 9-12 years
- In a well-managed aquarium, Distichodus lusosso can achieve a lifespan of 9 to 12 years, and sometimes up to 15 years with exceptional care. Their longevity depends on keeping them in a massive tank with excellent water quality, as they produce a substantial amount of waste. A highly efficient filtration system and regular, large water changes are vital to prevent chemical spikes and chronic stress. Proper diet, featuring a high proportion of vegetable matter, also supports their immune system and overall health.
- Adult size
- 35 cm
- The catalog's scalar value is 35 cm. The FishBase SPECIES table (v25.04 snapshot) source reports a maximum adult measurement of 38 cm for this species, recorded as total length (TL). The taxonomic record consulted is Distichodus lusosso (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
- Solitary
- Determining the sex of this species is visually impossible for the home aquarist, as there are no distinct external sexual dimorphisms. Because they grow exceedingly large and require massive aquariums, keeping a group to observe natural sex ratios is generally unfeasible. They can be kept singly or in a small group if the aquarium is vast (hundreds of gallons) to diffuse aggression. In a suitably massive setup, the exact sex ratio is less important than providing enough space to prevent territorial disputes.
- Feeding frequency
- Twice daily
- Due to their massive adult size and active swimming habits, they require substantial daily feedings. Feeding them one or two large meals a day ensures they receive enough sustenance, but care must be taken to remove any uneaten vegetable matter before it rots. They are aggressive eaters that will vigorously compete for food, so ensuring slower bottom-dwellers get their share can be challenging. A consistent feeding schedule helps moderate their temperament and prevents them from excessively bullying tank mates.
- Bioload
- High
- The Longnose Distichodus grows to a very large size and produces a massive bioload, characteristic of large, heavy-feeding African characins. Their voracious appetite for plant matter and meaty foods generates substantial solid waste that will quickly overwhelm a standard filter. A highly robust, over-engineered filtration system with powerful mechanical and biological stages is strictly required. Frequent, large-volume water changes and diligent gravel vacuuming are mandatory to maintain acceptable water parameters in their large aquariums.
- Flow
- Stagnant
- Originating from the Congo River basin, they are accustomed to significant water movement and thrive in a highly oxygenated environment with moderate to strong flow. Powerful canister filters and supplemental powerheads should be used to create a strong directional current that mimics a riverine habitat. Excellent water circulation is also crucial to ensure their massive amount of physical waste is pushed into the filter intakes. They will actively swim against the current, which provides necessary exercise for these large, muscular fish.
- Reproduction
- Oviparous
- Captive breeding of D. lusosso is extremely rare and undocumented in the home aquarium, likely due to the massive space required and unknown environmental triggers. In their natural riverine habitats, they are believed to be open-water egg scatterers that provide no parental care. Successfully simulating the seasonal flooding and water chemistry changes of the Congo River in captivity is practically impossible for standard hobbyists. Consequently, all specimens available in the trade are commercially wild-caught.
- Compatibility & tankmates
- They are semi-aggressive and highly robust fish that grow too large for a standard community aquarium. Small fish will likely be eaten, and slow-moving fish will be outcompeted for food and potentially harassed. They are best kept in a large 'monster fish' setup with other similarly sized, assertive African species like Bichirs, large Synodontis catfish, or robust Cichlids. Notably, they are voracious herbivores that will completely decimate and consume almost all live aquarium plants.
- Tank level
- Middle/Bottom
- They are highly active fish that will utilize all levels of the aquarium, but they spend the majority of their time cruising the mid to bottom levels. They constantly forage along the substrate and inspect hardscape for edible material. They require an enormous amount of unobstructed lateral swimming space to accommodate their large size and active nature. The tank should be decorated with massive pieces of driftwood and smooth boulders, avoiding any sharp rocks that could injure them during rapid movements.
Scientific Parameters & Models
FishBase
Window to the official scientific data of the species
Data synced on: 06/15/2026
- Phylogenetic uniqueness (PD50)
- 0.5
- Bayesian Length-Weight
- a = 0.01445, b = 3.05
- VulnerabilityLow to moderate vulnerability (28 / 100)
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
