Blue catfish

Blue catfish
	Blue catfish ( Corydoras nattereri )
Systematics
Order :	Catfish (Siluriformes)
Subordination :	Loricarioidei
Family :	Armored and calloused catfish (Callichthyidae)
Subfamily :	Armored catfish (Corydoradinae)
Genre :	Corydoras
Type :	Blue catfish
Scientific name
	Corydoras nattereri
	Steindachner , 1876

The blue armored catfish ( Corydoras nattereri ) is a freshwater fish native to southeastern Brazil . Its distribution area extends from the state of Espírito Santo to Paraná . There it occurs in the Rio Doce , in the Rio Jequitinhonha and in the Rio Paraíba do Sul . The species was named after Johann Natterer , who collected the type specimens .

features

Female blue armored catfish reach a maximum size of 6.5 cm, while males stay a little smaller with a length of 5.5 cm. The blue armored catfish has a typical Corydoras shape and a simple, blue-gray to brownish basic color. The belly is light to whitish. A blue-black longitudinal band begins behind the gill cover and extends over the sides of the body above or on the overlapping zone of the two rows of bone plates and ends at the base of the tail. A brown-black spot is located below the powerful, first dorsal fin ray. The fins are transparent and shimmer yellow. The upper row of bone plates on the sides of the body has 21 to 23 plates, the lower 20 to 21.

Fin formula : dorsal I / 7, anal I / 5–7, pectoral I / 8.

Reproduction

Females of the blue armored catfish lay around 30 to 50 relatively large eggs (ø 2 mm) per clutch, from which the young fish hatch after around five days and swim freely after another two days. The fry are already 2.5 to 3 cm long after three months.

Systematics

The blue armored catfish belongs to the Corydoras paleatus species group, which will likely be separated from Corydoras in the future and assigned to a new genus.

literature

Hans-Jochim Franke: Handbook of Welskunde. Urania-Verlag, 1985.
Günther Sterba : The world's freshwater fish. 2nd Edition. Urania, Leipzig / Jena / Berlin 1990, ISBN 3-332-00109-4 .
Axel Zarske: Corydoras nattereri Steindachner, 1877. In: Claus Schaefer, Torsten Schröer (ed.): The large lexicon of aquaristics. Eugen Ulmer, Stuttgart 2004, ISBN 3-8001-7497-9 , p. 270 f.

Web links

Blue catfish on Fishbase.org (English)

Individual evidence

↑ Markos A. Alexandrou, Claudio Oliveira, Marjorie Maillard, Rona AR McGill, Jason Newton, Simon Creer & Martin I. Taylor: Competition and phylogeny determine community structure in Müllerian co-mimics. Nature 469, 84–88 (January 2011), doi: 10.1038 / nature09660 Supplementary Information (5.9M) (PDF; 6.2 MB)
↑ Ingo Seidel: New knowledge about the relationships among armored catfish. in aquarium trade magazine No. 223 February / March 2012, Tetra-Verlag GmbH, ISSN 1437-4854

[1] Markos A. Alexandrou, Claudio Oliveira, Marjorie Maillard, Rona AR McGill, Jason Newton, Simon Creer & Martin I. Taylor: Competition and phylogeny determine community structure in Müllerian co-mimics. Nature 469, 84–88 (January 2011), doi: 10.1038 / nature09660 Supplementary Information (5.9M) (PDF; 6.2 MB)

[2] Ingo Seidel: New knowledge about the relationships among armored catfish. in aquarium trade magazine No. 223 February / March 2012, Tetra-Verlag GmbH, ISSN 1437-4854