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The Hypostomus sp. L-360, also called Firefin, is a Brazilian loricariid valued for its warm-toned fins and sturdy appearance. Listed under the aquarium code L-360, this fish remains an undescribed aquarium form rather than an officially named species. Its discreet, mostly nocturnal behavior is best observed in a mature aquarium offering shelter and good water circulation. This strain is wild collected and is distinguished by its high rarity. It is offered exclusively by Ton.Fish in Canada, making it a particularly interesting subject for specialized aquarists.

General description

Hypostomus sp. L-360 belongs to the loricariids, South American catfish equipped with a ventral mouth adapted for grazing surfaces. The code L-360 identifies a commercial form used in the aquarium trade and does not constitute an official species name. Like several Hypostomus, it has a strong build and prefers well-oxygenated aquariums structured with roots, rocks, and hiding places. It is mainly active after the lights go out. Despite its peaceful appearance, sufficient bottom space is important because adults may become territorial toward other specimens or bottom-dwelling catfish using the same shelters. Its availability remains very rare, and it is best suited to aquarists able to maintain stable water quality.

Geographic origin and biotope

The strain is associated with Brazil and freshwater environments of the Amazon basin. In nature, a Hypostomus of this type likely uses bottom areas where rocks, submerged wood, and accumulations of debris provide resting and feeding surfaces. In the aquarium, recreate a well-oxygenated environment with moderate to strong flow, efficient filtration, and limited waste accumulation. A layout combining durable roots, rounded stones, and caves is more suitable than a heavily planted aquarium with little open bottom space. Dim lighting and refuges encourage natural behavior, especially while wild-collected fish are acclimating.

Precise location and local name

In the aquarium trade, this form is primarily recognized by the code L-360 and the common name Firefin. The English name refers to the warm coloration seen in the fins, particularly when the fish is in good condition and viewed under neutral lighting. The name used by aquarists is therefore Firefin, while “Hypostomus sp.” indicates that the species-level identification is unresolved. This designation should be kept together with the L-code to avoid confusion with other Hypostomus showing orange fins. Because of its very limited availability, each specimen should be accompanied by its commercial origin and detailed acclimation information.

Appearance and physical characteristics

Hypostomus sp. L-360 has the typical shape of an armored catfish: a stocky body, bony plates, developed pectoral fins, and a ventral sucker mouth. Its overall coloration is usually dark, with a subtle pattern that helps it blend into roots and rocks. The Firefin’s distinctive feature is its fins, whose rays and margins may show orange to copper-red tones. Intensity varies with age, health, stress, and lighting. Odontodes may become more visible in adults. A size of about 20 cm is a cautious planning reference for the aquarium, allowing enough room without overcrowding the bottom structure or restricting movement.

General diet

Its diet should combine plant-based foods with moderate protein supplementation. Spirulina-based wafers, zucchini slices, cucumber, or blanched vegetables can complement surface grazing. It also accepts quality sinking foods, but protein-rich meals should not form the basis of its diet. Wild fish benefit from gradual dietary acclimation, with food offered in the evening when activity increases. Natural roots are useful for grazing behavior and provide an additional feeding surface. Remove leftovers to prevent water quality from deteriorating, especially in aquariums containing several bottom-dwelling fish. A varied diet supports better fin coloration and stable body condition.

Essential data

• River of origin:
• Local name used: Firefin
• Origin of the scientific name: Hypostomus is the genus assigned to this form; sp. indicates an unspecified species.
• Etymology of the full name: Hypostomus comes from Greek and refers to a mouth positioned underneath; sp. abbreviates species; L-360 is an aquarium code.
• Common/vernacular names: Firefin
• Family: Loricariidae
• Subfamily: Hypostominae
• Name pronunciation: hy-pos-to-mus - ess pee el three six zero
• Discovery:
• Maximum adult size: About 20 cm
• Water temperature and pH: 24 to 29 °C; pH 6.0 to 7.5
• Watercourse appearance and surrounding vegetation: Well-oxygenated freshwater, rocky substrate, and submerged wood; Amazonian riparian vegetation.
• Typical tankmates: Small characins; peaceful South American cichlids; other midwater fish; non-territorial loricariids.
• Temperament and behavior: Peaceful, discreet, and mainly nocturnal; may defend caves and shelters.
• Water depth:
• Sexual dimorphism: Adult males may develop more prominent odontodes; sexing can be difficult.
• Bottom structure and flow: Rocks, roots, and caves over a stable bottom; moderate to strong current and good oxygenation.

In your aquarium

To succeed with Hypostomus sp. L-360, choose a spacious, mature aquarium with effective filtration. Provide several shelters, clean well-oxygenated water, and feed after the lights go out with a varied plant-based diet. Since this is a very rare, wild-collected fish, acclimation should be gradual and carefully monitored. This Ton.Fish exclusive in Canada deserves thoughtful husbandry, without aggressive fish or overly dominant competitors for the bottom shelters.