Requires cool waters in the aquarium as sustained
high values can be problematic for this species. A
planted tank is best as it is kind to plants but will
keep the algae at bay. Can be a bit territorial with
other fish but do well together in groups. Diet:
Algae eater, tablet foods, lettuce, flake and small
live and frozen foods. Remarks:
This species (and one other) was removed from Otocinclus
into a new genus, Macrotocinclus, by Schaffer
(1997) and some publications use this change but it
is not widespread at present (2011). The recent paper
(2010) by Lehmann, P., F. Mayer and R.E. Reis have
resurrected Otocinclus arnoldi from the La
Plata basin from the synonymy of O. flexilis and
is thus a species in its own right based on three
distinguishing features: the possession of five branched
pectoral-fin rays, the larger number of enlarged odontodes
on the tip of the parieto-supraoccipital posterior
process, and having the prootic involved in the contact
with the hyomandibular articular condyle.
Imitator Sucker Catfish
South America:Brazil, Rio Jacuí, Rio Grande do Sul.
Type locality: Rio Jacuhy [Jacuí],
Rio Grande do Sul, Brazil.
H.A. and R. Riehl
1985 Aquarien atlas. Band 2. Mergus, Verlag für
Natur- und Heimtierkunde GmbH, Melle, Germany. 1216
p. Evers, H.-G. & I.Seidel: Mergus,
Baensch Catfish Atlas Volume 1, 1st English edn., 2005.
Pp.944. Ferraris, C.J. Jr., 2007. Checklist
of catfishes, recent and fossil (Osteichthyes: Siluriformes),
and catalogue of siluriform primary types. Zootaxa 1418:1-628.
Lehmann, P., F. Mayer and R.E. Reis,
2010. Re-validation of Otocinclus arnoldi Regan and
reappraisal of Otocinclus phylogeny (Siluriformes: Loricariidae).
Neotrop. Ichthyol. 8(1):57-68.