Overview

Comprehensive Description

Biology

Mainly nocturnal. Feeds on algae (Ref. 6868). Aquarium keeping: feeds on plants and roots; in groups of 5 or more individuals; minimum aquarium size 60 cm (Ref. 51539).
  • Ferraris, C.J. Jr. 2007 Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628. (Ref. 58032)
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Distribution

La Plata River and Paraná River: Argentina and Brazil.
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South America: vicinity of Rio de Janeiro, Brazil.
  • Schaefer, S.A. 2003 Loricariidae - Hypoptopomatinae (Armored catfishes). p. 321-329. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasi.l. (Ref. 36885)
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Physical Description

Size

Maximum size: 40 mm ---
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Max. size

5.0 cm SL (male/unsexed; (Ref. 36885))
  • Schaefer, S.A. 2003 Loricariidae - Hypoptopomatinae (Armored catfishes). p. 321-329. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasi.l. (Ref. 36885)
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Ecology

Habitat

Environment

demersal; freshwater; pH range: 6.0 - 8.0; dH range: 5 - 19
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Life History and Behavior

Life Cycle

Assumed to be the same as Corydoras species.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Macrotocinclus affinis

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

Download FASTA File
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Statistics of barcoding coverage: Macrotocinclus affinis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
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Statistics of barcoding coverage: Otocinclus cf. affinis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Threats

Not Evaluated
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Relevance to Humans and Ecosystems

Benefits

Importance

aquarium: highly commercial
  • Mills, D. and G. Vevers 1989 The Tetra encyclopedia of freshwater tropical aquarium fishes. Tetra Press, New Jersey. 208 p. (Ref. 7020)
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Wikipedia

Macrotocinclus

The golden otocinclus (Macrotocinclus affinis, formerly Otocinclus affinis) is one of the smallest known suckermouth catfish, often called a 'dwarf oto'. Endemic to Southeast Brazil, this herbivorous, rheophilic, bottom-feeder only grows to around 4 cm (1.6 in) in length. These small fish are often used for the purpose of controlling algae in small home aquariums.

M. affinis is a Batesian mimic of Corydoras nattereri. Due to its narrow stripe, M. affinis resembles this Corydoras species more than it does Otocinclus species.[1]

M. affinis prefers an aquarium with fast moving water, sandy substrate, and plenty of hiding areas (old broken clay pipes is a preferred hiding habitat). Preferred pH is slightly acidic with a tank temperature of 21–27 °C (70–81 °F). This particular species is not as hardy as many of the other Otocinclus species.

Gallery[edit]

See also[edit]

References[edit]

  1. ^ Axenrot, Thomas E.; Kullander, Sven O. (October 2003). "Corydoras diphyes (Siluriformes: Callichthyidae) and Otocinclus mimulus (Siluriformes: Loricariidae), two new species of catfishes from Paraguay, a case of mimetic association" (PDF). Ichthyol. Explor. Freshwaters 14 (3): 249–272. 

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