Common name
Peppermint bristlenose pleco (L183)
Scientific name
Ancistrus dolichopterus
Category
Freshwater fish
Group
Bristlenose plecos
Environment
Warm, soft to moderately mineralised freshwater
Origin
Rio Negro basin, South America
Care level
Intermediate
Adult size
Commonly about 12–15 cm
Expected lifespan
Often more than 10 years; dependable species-specific maximum is not well quantified
Minimum housing
150 L or larger mature aquarium with high oxygenation, wood and multiple caves
Temperature
24–29 °C
pH
4.5–7.0
Hardness / minerals
1–10 dGH; low to moderate conductivity preferred
Salinity
Freshwater
Lighting
Subdued with shaded caves
Placement / swimming zone
Bottom, wood and rock surfaces

Identity and search names

Single-species profile for Ancistrus dolichopterus, commonly associated with L183. Confirm provenance, persistent fin seams and diagnostic identity before using this name.

Search names: L183, Starlight bristlenose, White-seam bristlenose, Blue bristlenose

Environment and housing

Driftwood, shaded rockwork, high dissolved oxygen, strong biological filtration and several tight-fitting caves.

Water stability: Maintain 24–29 °C; pH 4.5–7.0; minerals: 1–10 dGH; low to moderate conductivity preferred; salinity: Freshwater. Stability, dissolved oxygen and nitrogen-cycle control matter more than chasing one exact reading.

Feeding and nutrition

Feeding ecology: Aufwuchs-oriented omnivore; algae-based foods, vegetables, wood-associated biofilm and measured invertebrate protein

Feeding routine: Provide mature biofilm, algae-rich sinking foods, vegetables and measured invertebrate protein. Feed after lights dim and verify abdominal condition.

Social structure and compatibility

One adult male per defended cave area; a compatible pair or breeding group needs substantially more space

Peaceful warm-water fish that do not monopolise caves or food. Avoid combining multiple adult males in cramped housing. Retain a cycled separation option for aggression, feeding exclusion, predation, injury or disease.

Adult load and life support

Projected adult load: Moderate to high for a 12–15 cm loricariid, with concentrated solids beneath wood, caves and vegetable feeding sites.

Filtration: Use oversized mature biological filtration, accessible prefilters and protected intakes. Preserve grazing surfaces without allowing waste pockets.

Aeration: Maintain high dissolved oxygen and circulation through wood and cave structures, with backup air during heat or outages.

Maintenance: Siphon beneath wood and caves, remove vegetables before spoilage, clean prefilters often and retain identity records with the fish.

Breeding and reproduction

Cave spawner. Do not compromise adult welfare, genetic identity, quarantine capacity or lawful rehoming to attempt breeding.

Quarantine, welfare and risk

Quarantine: Quarantine new fish in a separate fully cycled system for at least 30 days at the intended temperature and mineral chemistry. Use dedicated equipment; observe appetite, respiration, faeces, skin, fins, gills and behaviour; never add transport water to the display.

Welfare checks: Track abdominal condition, night feeding, cave conflict, respiration and fin-seam identity as the fish matures. Track individual body condition, feeding access, respiration, injury, abnormal hiding or aggression and use of the intended swimming zone.

Important warning

Do not assign L183 from colour alone. Confirm fin edging, spot pattern and provenance; common 80–100 L bristlenose advice is too small for a mature group.

Main risk: Misidentification with other spotted Ancistrus, slow starvation and inadequate oxygen or adult space.

Australian biosecurity and release

Never release fish, fry, eggs, aquarium water, sediment, plants, live food or wet equipment into drains, dams or natural waterways. Australian import eligibility is species-specific: check the current permitted ornamental-fish list and BICON conditions by accepted scientific name. Import requires a permit, an approved source country and approved-arrangement isolation. Check current South Australian noxious-fish and movement rules before purchase, sale, transport or disposal.

Current check: Current lawful import, possession or movement must be checked by accepted scientific name. Absence from one state list is not import approval.

Detailed husbandry

Identity Scope
Single-species profile for Ancistrus dolichopterus, commonly associated with L183. Confirm provenance, persistent fin seams and diagnostic identity before using this name.
Adult Size And Space
Expected adult size: Commonly about 12–15 cm. Minimum permanent housing: 150 L or larger mature aquarium with high oxygenation, wood and multiple caves. Adult dimensions, group or territory needs, swimming footprint, oxygen demand and waste production matter more than juvenile sale size.
Social Structure
One adult male per defended cave area; a compatible pair or breeding group needs substantially more space
Swimming Zone
Primary zone: Bottom. Keep that zone open enough for normal movement, feeding, refuge and escape.
Feeding Ecology
Aufwuchs-oriented omnivore; algae-based foods, vegetables, wood-associated biofilm and measured invertebrate protein
Feeding Plan
Provide mature biofilm, algae-rich sinking foods, vegetables and measured invertebrate protein. Feed after lights dim and verify abdominal condition.
Water Stability
Maintain 24–29 °C; pH 4.5–7.0; minerals: 1–10 dGH; low to moderate conductivity preferred; salinity: Freshwater. Stability, dissolved oxygen and nitrogen-cycle control matter more than chasing one exact reading.
Adult Projected Load
Moderate to high for a 12–15 cm loricariid, with concentrated solids beneath wood, caves and vegetable feeding sites.
Filtration
Use oversized mature biological filtration, accessible prefilters and protected intakes. Preserve grazing surfaces without allowing waste pockets.
Aeration
Maintain high dissolved oxygen and circulation through wood and cave structures, with backup air during heat or outages.
Maintenance
Siphon beneath wood and caves, remove vegetables before spoilage, clean prefilters often and retain identity records with the fish.
Habitat Structure
Driftwood, shaded rockwork, high dissolved oxygen, strong biological filtration and several tight-fitting caves.
Compatibility Plan
Peaceful warm-water fish that do not monopolise caves or food. Avoid combining multiple adult males in cramped housing. Retain a cycled separation option for aggression, feeding exclusion, predation, injury or disease.
Breeding Plan
Cave spawner. Do not compromise adult welfare, genetic identity, quarantine capacity or lawful rehoming to attempt breeding.
Quarantine
Quarantine new fish in a separate fully cycled system for at least 30 days at the intended temperature and mineral chemistry. Use dedicated equipment; observe appetite, respiration, faeces, skin, fins, gills and behaviour; never add transport water to the display.
Welfare Checks
Track abdominal condition, night feeding, cave conflict, respiration and fin-seam identity as the fish matures. Track individual body condition, feeding access, respiration, injury, abnormal hiding or aggression and use of the intended swimming zone.
Biosecurity And Release
Never release fish, fry, eggs, aquarium water, sediment, plants, live food or wet equipment into drains, dams or natural waterways. Australian import eligibility is species-specific: check the current permitted ornamental-fish list and BICON conditions by accepted scientific name. Import requires a permit, an approved source country and approved-arrangement isolation. Check current South Australian noxious-fish and movement rules before purchase, sale, transport or disposal.
Main Risk
Misidentification with other spotted Ancistrus, slow starvation and inadequate oxygen or adult space.
Overridable Warnings
Do not assign L183 from colour alone. Confirm fin edging, spot pattern and provenance; common 80–100 L bristlenose advice is too small for a mature group.

Sources

Current accepted identity or qualified trade identity, former names, adult scale, social structure, feeding ecology, adult projected load, filtration, aeration, maintenance, quarantine, welfare, Australian import controls and South Australian movement or no-release obligations were rechecked. AquaNexus wording is original.