Named for the Cocama-Cocamilla Indian tribes that used to be dominant in the lower Ucayali and lower Marañon region of Peru plus neighbouring parts of Brazil.
Type locality is ¡s ‘Quebrada Yamayacu, about 4°55′S, 73°43′W, tributary to the caño of the cocha Supay in Jenaro Herrera, Provincia Requena, Departamento Loreto, Peru’, and O. cocama is thought to occur throughout the lower Ucayali and Marañon in Peru.
Otocinclus spp. are mostly restricted to small tributaries or slow-flowing marginal zones of larger rivers and usually associated with aquatic vegetation or terrestrial grasses growing in the water. They tend to occur in large numbers, often among the vegetation in the upper part of the water column, near the surface.
The type locality of O. cocama is described as a creek containing clear water with dense marginal vegetation among which the fish were found.
Maximum Standard Length
40 – 45 mm.
Aquarium SizeTop ↑
Aquarium base dimensions of 45 ∗ 30 cm or equivalent should be the smallest considered for long-term maintenance.
Requires a mature, densely-planted set-up, ideally with floating vegetation and roots, twigs or branches to add structural complexity. Dried leaf litter can also be added if you wish and will be grazed by the fish as it decomposes.
Use gentle filtration; an air-powered sponge-style unit should prove adequate in most cases. This species requires stable water conditions and should never be added to an immature aquarium.
Temperature: 21 – 25 °C
pH: 6.0 – 7.5
Hardness: 36 – 179 ppm
Behaviour and CompatibilityTop ↑
Peaceful with other species but does not make an ideal community fish due to its small size and rather timid nature. Ideally it should be kept alone or at most with diminutive, non-aggressive characids, smaller callichthyid or loricariid catfishes, and perhaps freshwater shrimp from the genera Caridina or Neocaridina.
Otocinclus spp. arer gregarious by nature and should ideally be maintained in a group of 6 specimens or more.
Fully-grown adult males tend to be 5-10 mm smaller than females, and possess a conical urogenital papilla behind the anus which is absent in females.
Males also possess a flap on the dorsal surface of the unbranched pectoral-fin
This stunning miniature Loricariid has only been available in the hobby since 2001, and was described to science in 2004. As with other otos, it can be a little delicate when first imported and should be quarantined carefully until it’s settled.