Longfin Orange/Black Marble Bristlenose - Ancistrus sp.

Longfin Orange/Black Marble Bristlenose (Ancistrus sp.)

The Longfin Orange/Black Marble Bristlenose, Ancistrus sp., is a striking captive-bred bristlenose pleco variety with flowing extended fins and bold orange, black and marbled patterning across a compact armoured body. Like other bristlenose catfish, it has a sucker mouth for grazing surfaces, a broad head and, in mature males, distinctive bristle-like growths around the snout. This is a much more manageable aquarium catfish than common plecos, but the longfin form needs extra care around fin-nipping tank mates, rough décor and strong competition at feeding time.

Common Name:
Longfin Orange/Black Marble Bristlenose, Longfin Marble Bristlenose Pleco, Orange Black Marble Bristlenose, Longfin Bristlenose Catfish, Bristlenose Pleco.

Scientific Name (Latin):
Ancistrus sp.
Captive-bred colour and longfin form; exact species or hybrid lineage is usually not confirmed in the aquarium trade.

Maximum Size:
Usually around 10–12 cm, with some individuals appearing slightly larger when the longfin extensions are included.

Water Type:
Freshwater

Origin / Natural Habitat:
This orange and black marble longfin form is captive-bred and does not occur as a natural wild population. Ancistrus species are native to tropical freshwater habitats in South America, where they are associated with streams, rivers, submerged wood, rocks, root tangles and oxygen-rich marginal areas. Many aquarium bristlenose strains are long-established captive lines rather than confirmed wild species.

Water Parameters:
Temperature: 22–27°C
pH Range: 6.0–7.8
Hardness or Salinity: Soft to moderately hard freshwater; adaptable when captive-bred, but clean, stable and well-oxygenated water is important.

Temperament:
Peaceful with most community fish, but adult males can become territorial with other bristlenose or similar bottom-dwelling plecos, especially around caves and feeding areas. Longfin specimens should not be kept with fish likely to nip, tear or harass their extended fins.

Diet:
Primarily herbivorous/aufwuchs-grazing with omnivorous elements. Offer algae wafers, spirulina tablets, sinking pleco foods, blanched courgette, cucumber, spinach, peas and other vegetable matter, plus occasional protein foods such as frozen bloodworm, brineshrimp or specialist sinking carnivore foods. Do not rely on natural aquarium algae alone, as most tanks cannot provide enough food long term.

Minimum Tank Size:
A minimum of 90 litres is recommended for a single adult, with larger aquariums preferred for pairs, breeding groups or busy community setups. Provide enough floor space, caves, wood and feeding areas to reduce territorial pressure.

Behaviour & Activity:
A bottom-dwelling and surface-grazing catfish that spends much of its time attached to wood, rocks, glass, caves and plant leaves. It is often more active at dusk, after lights out or during feeding, although settled individuals may graze in the open. Mature males usually develop stronger facial bristles than females and may guard caves if breeding. Longfin individuals move more gracefully but can be more vulnerable to torn fins if kept with rough décor or nippy fish.

Aquarium Category:
Community Fish
Suitable with peaceful community fish such as tetras, rasboras, barbs, livebearers, rainbowfish, gouramis, Corydoras-type catfish, peaceful cichlids and other non-aggressive tank mates. Avoid aggressive cichlids, large predators that may injure it, tiger barbs or other fin-nippers, and keeping multiple adult males together in cramped aquariums.

Special Requirements or Care Notes:
Provide driftwood or bogwood, caves, shaded retreats and smooth hard surfaces for grazing. Wood is strongly recommended for natural rasping behaviour and cover. Keep the aquarium mature and well-filtered, as bristlenose plecos produce noticeable waste. Maintain good oxygenation and regular water changes. Long fins can be damaged by sharp rocks, abrasive ornaments or poor water quality, so use smooth décor and choose tank mates carefully. If breeding, males may guard cave-spawned eggs, and fry need excellent water quality with constant access to fine vegetable-based foods.

Suitable for:
Beginner to intermediate fishkeepers

Availability:
Occasional in trade / Captive-bred colour and longfin form

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.