L187 Chaetostoma paersi 4 - (Chaetostoma paersi) — 4-6cm

Overview

The freshwater fish UK aquarist seeking a compact, peaceful Andean hillstream catfish will find Chaetostoma paersi (L187) a fascinating bottom-dwelling specialist that thrives in cool, fast, pristine water. Native to Andean river systems of Venezuela, this distinctive loricariid catfish displays attractive patterning and specialized habitat requirements that make it both rewarding and challenging to keep. Available for sale UK hobbyists should note that this species requires moderate-level care with cooler temperatures, high oxygenation, and strong water flow—conditions quite different from most tropical aquarium fish. At 4-6cm, these specimens are approaching adult size of 6cm and ready for a well-maintained, species-appropriate aquarium.

Appearance and Colouration

Chaetostoma paersi displays a robust, armoured body typical of loricariid catfish, with overlapping bony plates and a flattened ventral profile adapted for clinging to rocks in fast-flowing water. Colouration features an olive-brown to grey base with darker mottling, reticulation, or banding creating an attractive camouflage pattern. The fins display subtle banding, and the overall appearance is compact and streamlined. The head is broad with a ventral sucker mouth adapted for grazing biofilm and algae from rock surfaces. At 4-6cm, specimens are nearing full adult size and display well-developed finnage and patterning. Males may develop slightly broader heads and more pronounced odontodes.

Natural Habitat

Native to Andean river systems in Venezuela, Chaetostoma paersi inhabits fast-flowing, cool, highly oxygenated streams and rivers with rocky substrates and abundant biofilm and aufwuchs growth. These environments feature strong currents, crystal-clear water, and stable, pristine conditions. Water temperatures are cooler than typical tropical systems due to high altitude and constant flow from mountain sources. In the wild, this species grazes biofilm, algae, and organic matter from rock surfaces, using its powerful sucker mouth to maintain position in strong currents. Recreating these demanding conditions is essential for long-term success.

Aquarium Setup

Provide a minimum of 80 litres with efficient, high-capacity filtration to maintain pristine water quality and strong oxygenation. Create strong water flow using powerheads or additional circulation pumps to replicate natural river currents. Use smooth rocks, pebbles, and driftwood to create grazing surfaces and hiding places. Maintain cool water temperatures between 20-26°C, ideally at the lower end of the range. Avoid warm, stagnant, or dirty conditions, as this species is highly sensitive to poor water quality and low oxygen. Perform frequent partial water changes to maintain stability. Ensure excellent oxygenation through surface agitation and efficient filtration.

Diet and Feeding

Chaetostoma paersi is primarily a grazer of biofilm and aufwuchs, supplemented with herbivorous and occasional protein-rich foods. Offer sinking algae wafers, spirulina-based foods, blanched vegetables such as courgette and cucumber, and regular supplemental protein including frozen or live insect foods and small invertebrate-safe options. Provide smooth rocks with natural biofilm growth for continuous grazing. Feed once daily in the evening, removing uneaten food after a few hours to maintain water quality. A varied, balanced diet with adequate plant matter and protein supports healthy growth, vibrant colouration, and overall vitality.

Behaviour and Temperament

Chaetostoma paersi is peaceful, shy, and primarily nocturnal, though it can be observed grazing during the day in secure, well-maintained aquariums. This species is non-aggressive towards tankmates and spends its time clinging to rocks, driftwood, and glass, grazing biofilm and algae. It is most active during dawn, dusk, and night. During the day, it often rests in caves or under ledges. This species is territorial towards conspecifics if space and hiding places are insufficient, though aggression is rarely serious. In a well-structured aquarium with ample grazing surfaces, multiple individuals may coexist peacefully.

Suitable Tank Mates

Compatible with small peaceful community fish that appreciate cooler water temperatures, including tetras, rasboras, corydoras, and small peaceful livebearers. Other hillstream species such as hillstream loaches or cool-water catfish may coexist if the aquarium is spacious and well-structured. Avoid large aggressive cichlids, fin-nipping species, highly territorial bottom dwellers, large predatory fish, and overly boisterous species that outcompete it for food. Choose tankmates that tolerate cooler temperatures, strong currents, and high oxygenation. A quiet, well-oxygenated community tank with similarly sized, non-aggressive companions is ideal.

Breeding

Breeding is uncommon in home aquaria and usually requires excellent water quality, strong oxygenation, cool clean water, and well-structured caves or crevices for egg deposition. Males typically guard eggs in caves until they hatch. Successful breeding demands pristine conditions, careful conditioning with high-quality foods, and appropriate environmental triggers. There is limited documented information on successful home breeding, and most aquarists keep Chaetostoma paersi for display rather than reproduction. Dedicated enthusiasts with appropriate facilities and experience may achieve success with careful research and preparation.

Special Considerations

Requires cool, highly oxygenated, very clean water with strong current and plenty of smooth rocks, driftwood, and hiding places. Avoid warm, stagnant, or dirty conditions, as this species is sensitive to elevated temperatures, low oxygen, and poor water quality. Maintain stable parameters with frequent partial water changes and efficient filtration. This species is not suitable for typical tropical community aquariums with warm temperatures and low flow. Moderate care level indicates experience with hillstream or cool-water specialists is beneficial. Ensure all tankmates tolerate similar conditions.

Why Buy from Tropical Fish Co

Tropical Fish Co is a trusted UK supplier of healthy, vibrant loricariid catfish including Chaetostoma paersi (L187). Each fish is carefully selected for robust health, active behaviour, and excellent condition. Our livestock is quarantined and health-checked before dispatch, ensuring you receive only the finest specimens. We provide expert care advice, detailed species information, and ongoing support to help you succeed with specialist fish. With fast, secure delivery across the UK and a commitment to sustainable, responsible fishkeeping practices, Tropical Fish Co is your reliable partner for premium catfish and aquatic livestock.