Gold nugget pleco (Baryancistrus spp.) care guide

Group
Freshwater fish
Other names
Baryancistrus xanthellus, L018, L081, L085, L177, L142 (snowball pleco), L019, L057 (black pleco)
Family
Loricariidae (suckermouth armoured catfishes)
Origin
South America: mainly fast-flowing, rocky rivers of the Brazilian Amazon, especially the Rio Xingu, Rio Iriri and Rio Tapajós, with other species from Amapá and elsewhere.
Water
freshwater
Maximum size
40 cm
Temperature
25–31°C
pH
6–7.4
Hardness
Soft to medium
Minimum tank
300 litres
Care level
intermediate
Temperament
semi_aggressive

Care

Baryancistrus is a genus of heavy-bodied plecos. The name means "heavy Ancistrus". PlanetCatfish lists about 21 species, from about 8 cm up to 40 cm standard length, with most reaching about 25–30 cm. Figures vary a lot by species, so check the species or L-number before buying and plan for the adult size. The best known are the gold nugget plecos, sold under several L-numbers (L018, L081, L085, L177 and the LDA numbers LDA060, LDA116 and LDA117). Most of these are Baryancistrus xanthellus from the Volta Grande of the Rio Xingu and the Rio Iriri; it reaches about 22–30 cm and has bright yellow spots and yellow fin edges that are boldest in young fish. Other species seen include L142 (the snowball or big white spot pleco, about 25 cm, from the Rio Tapajós), L019 (about 25 cm, Rio Xingu) and L057, an all-black pleco from the Rio Araguari in Amapá (about 30 cm). These are rapids fish. They need warm, very well oxygenated water with a strong current: PlanetCatfish gives 25–30 °C for L019 and 27–31 °C for L142, with pH about 6.0–7.4. Use powerful filtration plus extra water movement, rounded river stones, slate caves and bogwood branches. A minimum of about 300 litres for one adult of a 25–30 cm species is our estimate; larger species need more. Newly imported fish can be delicate and losses in the first weeks are common, but once settled in good conditions they are not difficult. Many become territorial towards other bottom-dwellers as they grow, so give each fish its own cave and plenty of space. Baryancistrus xanthellus is listed as Near Threatened on the IUCN Red List (FishBase, assessed 2018); its Xingu habitat has been heavily affected by the Belo Monte dam. Many fish in the trade are wild-caught. Selling: our policies require the adult size and long-term tank needs to be stated clearly in the listing. Large fish must travel by a specialist live-animal courier (see the Livestock shipping guide). Sources: PlanetCatfish genus page (planetcatfish.com/common/genus.php?genusid=19); PlanetCatfish species pages for L019, L057 and L142 (planetcatfish.com/common/species.php?speciesid=186, 835 and 31); FishBase (fishbase.se/summary/Baryancistrus-xanthellus.html); Wikipedia (en.wikipedia.org/wiki/Baryancistrusxanthellus). Checked October 2026.

Diet

Mainly grazers on algae and biofilm, taking some small invertebrates such as midge larvae. Feed a largely plant-based diet: algae wafers and vegetable pellets, blanched courgette, cucumber and sweet potato, with occasional frozen bloodworm or prawn. Provide wood as well.

Breeding

Breeding is unreported or very rare for most species, including L019, L057 and L142 (PlanetCatfish). Like other plecos they are cave spawners, with the male guarding the eggs, so offer suitable caves in a large, mature tank.

Compatibility and tank mates

Can be kept with small to medium cichlids, characins and other fish that like warm, fast-flowing, oxygen-rich water. Adults are often territorial towards other plecos and bottom-dwellers, so keep several only in a large tank with many caves.

Last updated 5 October 2026. Community-edited care guide on Aquatic-Auctions.

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