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Catalert.png Please copy and paste ' [[Category:Otocinclus]] ' into the end of your article to include it in this category.

About Otocinclus[edit]

Otocinclus or Otos for short, are a small non-aggressive algae eating catfish about 3-5cm (1.2-2") long.

Alternative names[edit]

Dwarf Oto, Dwarf Suckers. Pronounced "auto SINK luss"


There are a number of species in this genus.


There are also species that go by the name Paraotocinclus (for example, the PitBull pleco), and can be mislabelled as Otocinclus when young. They are different from Otocinclus in that the Paraotocinclus have an adipose fin, whereas the Otocinclus do not.


Herbivores with a preference for eating algae. Feed them zucchini (courgette) or spinach if there isn't enough algae in their tank. Some fish will also accept algae wafers.


Otocinclus have a lifespan of 3-5 years. Most Otocinclus kept in captivity live an average of 3 years.[1]


Being small herbivores they need to eat constantly. So they spend most of their time on the glass or on plant leaves using their sucker mouth to hold on. They are very placid animals that like to be in a group of at least 3 or more.

They have been known to be a small threat to slow-moving and high-backed fish such as the Discus and Angelfish. As with many suckermouth catfish, they can develop a taste for slime coats, which are often found on slow and high-backed fish.


They prefer a well planted tank, preferably with large smooth vertical surfaces to hold onto such as slate and broad-leaved plants.


Many of the Otocinclus found in stores are wild caught. See the video below of Otos being wild caught in Venezuela. Only a small percentage of these fish will survive to make it to tanks in stores in the West.

Otos being wild caught: Pair of Otos mating:


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