Macrotocinclus affinis

Otocinclus affinis, the golden otocinclus, is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Hypoptopomatinae, the cascudinhos. This catfish is endemic to southeastern Brazil, where it occurs in norther Rio de Janeiro state and the Ribeira de Iguape River in Sao Paulo state. The golden otocinclus is a herbivorous, rheophilic, bottom-feeder reachhes a standard length of 5 cm (2.0 in). The close relatives of this small fish are often used for the purpose of controlling algae in small home aquariums, under the name Otocinclus affinis. In reality, they belong to the species O. vittatus, O. vestitus and O. macrospilus and O. huaorani. The real O. affinis is rare in the aquarium hobby.

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