Corydoras albolineatus KNAACK, 2004

C056

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.

albolineatus: from the Latin albus, meaning white, and linea, meaning line, in allusion to the white lateral stripe on each flank.

Classification

Order: Siluriformes Family: Callichthyidae

Distribution

Type locality is on the north bank of the lower Río Paraguá, Río Iténez system, Santa Cruz Department, southeastern Bolivia.

The Iténez is known as the Guaporé in Brazil and drains into the Río Mamoré, thus forming part of the upper Río Madeira system, itself a major tributary of  the Amazon.

Habitat

In the upper Iténez (Guaporé) it most commonly inhabits riparian zones with sandy substrates or edges of sand banks, although it’s also been collected in smaller streams and residual flood waters.

It typically forms large aggregations of up to several thousand individuals and at the confluence of the ríos Paraguá and Iténez occurs sympatrically with the congener C. paragua.

Water parameters taken at several localities between 2001-2003 included water temperature 29.1-31.6°C/84.4-88.9°F, pH 6.47-7.46 and conductivity 24-27 µS/cm.

Maximum Standard Length

The largest officially-recorded female specimen measured 36.9 mm with males 5-10 mm smaller.

In the aquarium females have been recorded to reach 50 mm and males 45 mm.

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: 22 – 32 °C

pH: 6.0 – 7.5

Hardness: 0 – 179 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 ↑

Not a common fish in the aquarium hobby but is available occasionally and may be confused with C. xinguensis, a deeper-bodied fish.

It can be told apart from congeners by the following characters: body with a wide, white, longitudinal band and numerous small brown spots on top of the head and snout; all fins without markings; snout length fitting 6.3-8.0 times in SL; head length fitting 2.0-2.5 times in SL; snout short and rounded in side profile; dorsal and pectoral fins with I, 7 rays; anal and ventral fins with I, 5 rays; caudal-fin with iii 6-6 ii rays; 20-22 plates in upper lateral row, 19-20 in lower row.

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

1. Knaack, J., 2004 - Zoologische Abhandlungen (Dresden) 54: 55-105
   Beschreibung von sechs neuen Arten der Gattung Corydoras La Cépède, 1803 (Teleostei: Siluriformes: Callichthyidae).
2. Ferraris, C. J., Jr., 2007 - Zootaxa 1418: 1-628
   Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types.
3. Fuller, I. A. M., and H-G. Evers, 2005 - Verlag A.C.S. GmbH: 1-384
   Identifying Corydoradinae Catfish.