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Scientific Name Otocinclus mariae  Fowler, 1940
Common Names Maria's Oto
Dwarf Sucker, Dwarf<em> Otocinclus</em>, Marias Dværgsugemalle (Denmark), Oto
Type Locality Boca Chapare, Río Chimore, tributary to Río Ichilo, about 15°58'S, 64°42'W, Río Mamoré system, Bolivia.
Pronunciation auto SINK luss - MAR ee ae
Etymology Greek, ous, oto = ear + Latin, cinclus = latticework; in allusion to the holes of the head in the ears. 
Hop to next section Species Information
Size 33mm or 1.3" SL. Find near, nearer or same sized spp.
Identification Very similar to O. vittatus.
Sexing Females are larger and broader especially when viewed from above.
Hop to next section Habitat Information
Distribution South America: Upper Madeira and lower Amazon River basins.
Amazon, Lower Amazon (click on these areas to find other species found there)
La Plata, Paraná, Paraguay (click on these areas to find other species found there)
Amazon, Middle Amazon (Solimoes), Madeira, Upper Madeira (click on these areas to find other species found there)

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IUCN Red List Category Least Concern, range map and more is available on the IUCN species page. Last assessed 2020.
pH 5.5 - 7.5
Temperature 21.0-26.0°C or 69.8-78.8°F (Show species within this range)
Hop to next section Husbandry Information
Feeding Initially algae, add a shoal to an "algaefied" tank and then supplement diet with sinking tablets and the usual cucumbers / lettuce or courgette (zucchini). User data.
Furniture Large leafed plants and vertical flat rock surfaces (especially slate). Not essential, but likes bogwood and a large rounded substrate. Live plants seem essential to the long term survival of this fish.
Compatibility Peaceful.
Suggested Tankmates Keep in groups (preferably at least six) with any small to mid-sized community fish.
Breeding See Shane's World article.
Breeding Reports There is no breeding report.
Hop to next section Further Information
Reference Proceedings of the Academy of Natural Sciences of Philadelphia v. 92, pp 83, Figs. 41-43.
Registered Keepers There is no registered keeper.
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There are 4 records of this fish being seen, view them all.
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Last Update 2023 Aug 12 00:04 (species record created: 2004 May 19 00:00)