Corydoras cruziensis
Santa Cruz Cory
Etymology
Corydoras: from the Ancient Greek κόρυς (korus), meaning ‘helmet’, and δορά (dora), meaning ‘skin, hide of an animal’, in allusion to the rows of bony plates on the flanks of genus members.
cruziensis: named for Santa Cruz Department, Bolivia.
Classification
Order: Siluriformes Family: Callichthyidae
Distribution
The precise extent of its range is unclear but it appears restricted to the Bolivian portion of the Río Madeira basin, and possibly the Mamoré and Beni tributary drainages.
Type locality is ‘Guarayos, Santa Cruz Department, Bolivia, 16°20.014’S, 62°50.912’W, elevation 215 meters’.
Maximum Standard Length
45 – 50 mm.
Aquarium SizeTop ↑
Minimum base dimensi0ns of 80 ∗ 30 cm are recommended.
Maintenance
Ideally use a substrate of fine sand, although rounded gravel is an acceptable alternative provided it’s kept scrupulously clean.
Other décor is largely down to personal choice, but some cover should be provided to give the fish security.
Water Conditions
Temperature: 20 – 28 °C
pH: 6.0 – 8.5
Hardness: 36 – 215 ppm
Diet
Corydoras spp. are foraging omnivores and will accept most sinking dried foods, as well as small live and frozen varieties such as bloodworm, Tubifex, etc.
Feeding a varied diet will ensure the fish are in optimum condition.
Under no circumstances should they be expected to survive on ‘left-overs’ from other inhabitants of the aquarium or relied on to ‘clean’ the aquarium.
Behaviour and CompatibilityTop ↑
Peaceful and gregarious. Should be maintained in a group of at least 4-6 individuals.
Sexual Dimorphism
Females tend to grow larger, and sexually mature individuals are noticeably rounder and higher-bodied than males.
NotesTop ↑
This species is not well-documented but is said to differ from the comparable C. punctatus by possessing larger dark markings on the body which may form an irregular midlateral stripe in some specimens.
Unfortunately diagnostic characters cannot be provided since we’ve been unable to obtain the type description, and little has been written about the species since it was published.
The genus Corydoras is among the largest catfish groups and currently contains over 150 valid species.
It is included in the family Callichthyidae, of which members are often referred to collectively as ‘armoured’ or ‘mailed’ catfishes group due to the presence of bony plates in place of scales on the body.
Their taxonomy can be confusing, and numerous undescribed species are also thought to exist.
Fish of unconfirmed identification entering the aquarium hobby are therefore typically assigned a ‘C‘ or ‘CW‘ number for purposes of reference and organisation.
They are facultative air breathers and possess a modified, highly vascularised intestine which has evolved to facilitate uptake of atmospheric oxygen and aid survival in oxygen-deprived environments. In the aquarium you’ll occasionally see them rising to the surface to take in gulps of air.
The stiffened pectoral-fin spines are capable of piercing human skin and a ‘sting’ can be very painful indeed, so care should be exercised when handling them.
It is thought that secretions from the axillary glands at the base of each spine may even be mildly toxic or venomous.
References
- Knaack, J., 2002 - VDA aktuell 2002(3): 60-69
Ein weiterer neuer Panzerwels aus Bolivien: Corydoras cruziensis n. sp. (Pisces, Siluriformes, Callichthyidae). - Reis, R. E., S. O. Kullander and C. J. Ferraris, Jr. (eds), 2003 - EDIPUCRS, Porto Alegre: i-xi + 1-729
Check list of the freshwater fishes of South and Central America. CLOFFSCA. - Ferraris, C. J., Jr., 2007 - Zootaxa 1418: 1-628
Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. - Fuller, I. A. M., and H-G. Evers, 2005 - Verlag A. C. S. GmbH: 1-384
Identifying Corydoradinae Catfish.
