Edit Devario interruptus

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Name

Scientific name

Devario interruptus

Described by

Authority Day, Year 1870, Bracketed

Family

Cyprinidae

Common names

Not recorded

Photograph credits

All 2 credited

Summary

Devario interruptus is a devario from the Hotha valley and nearby areas of southwestern Yunnan, China, close to the border with Myanmar. Sh…

Size and aquarium

Maximum size

60mm, standard length

Aquarium size

Minimum length 75 cm, Minimum depth 30 cm

Water

Water conditions

Temperature 16–21°C, pH 6.5–7.5

Hardness

2–10dGH

Conductivity

Not recorded

Behaviour

Temperament

Peaceful

Community suitability

Community-safe

Where it lives

Countries, regions, rivers and lakes

China, Ayeyarwady

Writing

Etymology

Devario: appears to be derived from a local vernacular name for the type species of the genus Cyprinus (now Devario) devario Hamilton, 1822. interruptus: from …

Distribution

Type locality is 'Hotha, Yunnan Province, China' which corresponds to the Hotha/Husa valley in Longchuan County, Dehong Prefecture, Yunnan province, southweste…

Habitat

This species has mostly been collected from small (1-2 metres wide, 20 – 40 cm deep), moderate-to-swiftly-flowing streams with clear water, substrates of sand,…

Aquarium size

An aquarium with surface dimensions of 75 ∗ 30 cm or similar should be the smallest considered.

Maintenance

No information regarding captive care exists but presumably it won't prove difficult to keep in a well-maintained set-up as with related species. It's likely t…

Water conditions

Temperature: Average air temperatures in Baoshan Prefecture range from 48.2 - 70.7°F/9 - 21.5°C so this species is likely to prefer cooler conditions between 1…

Diet

Almost certain to prey chiefly on insects and their larvae in nature although in the aquarium it's a largely unfussy feeder and will accept most foods. A good …

Behaviour and compatibility

Probably not an aggressive fish but may intimidate slow-moving or timid tankmates with its constant activity and vigorous feeding behaviour, meaning it's proba…

Sexual dimorphism

Sexually mature females should be rounder-bellied, less colourful and a little larger than males. When in breeding condition the lower half of the body is suff…

Reproduction

Like most small cyprinids Devario spp. are egg-scattering free spawners exhibiting no parental care. When in good condition they will spawn often and in a well…

Notes

This species is more-or-less unheard of in the aquarium hobby at time of writing and has yet to be exported as far as we know. It's distinguishable from simila…

This species is more-or-less unheard of in the aquarium hobby at time of writing and has yet to be exported as far as we know.

It's distinguishable from similar-looking congeners by a combination of characters as follows: lateral line incomplete with 7-17 pored scales; infraorbital process absent; 7-8 branched dorsal-fin rays; usually 10-11 branched anal-fin rays; flank markings consisting of a series of short, relatively wide and equally deep vertical bars/blotches which are slightly wider than the P stripe; P stripe consisting of a row of contiguous dark blotches and terminating at base of caudal-fin; cleithral spot present; no barbels.

It's most easily confused with D. maetaengensis and D. shanensis but in D. shanensis the lateral line is complete or incomplete with 23-25 pored scales, rudimentary maxillary barbels may be present, and the flank markings comprise a series of vertical bars which become gradually deeper, then gradually shorter, with the most posterior the same depth as the P stripe. The P stripe itself is uniformly-pigmented.

In D. maetaengensis the lateral line is complete with 31-35 pored scales, both rostral and maxillary barbels are present, and the flank markings are comparable to D. shanensis except the P stripe which consists of a series of contiguous blotches.

In recent years it's become commonplace to refer to the stripes on the body and fins of danionins as follows:

- P stripe: or 'pigment stripe' is the central, dark, lateral stripe on the body which extends into the caudal-fin in some species. Stripes above it are numbered P+1, P+2, etc., and those beneath P-1, P-2, P-3.
- A stripe: the central stripe on the anal-fin; the proximal stripe (above it) is A+1 and the distal stripe (beneath) A-1.
- D stripe: The submarginal dorsal-fin stripe.

Following Fang (2003) Devario spp. are characterised by: possession of a P stripe extending onto the median caudal-fin rays; a short maxillary barbel (absent in some species); absence of the A stripe (a less distinct, relatively wide stripe is present in some species, e.g., D. acrostomus, D. annandalei, D. xyrops); a short, wide premaxillary process (cleft in the upper jaw) with a tiny apophysis (bony tubercule) touching the kinethmoid bone; infraorbital 5 not or slightly reduced.

The current genus name has only been in general use since 2003 prior to which members were considered to belong to the genus Danio.

Older, molecular, phylogenies tended to agree that the latter represented a monophyletic group consisting of two major clades; the 'Danio devario' group containing the larger, deeper-bodied species and the 'D. rerio' clade comprising the smaller, slimmer fish.

However in 2003 Fang Fang conducted a more detailed study based on morphological characters which included members of other related genera, and the results suggested for the first time that the genus Danio as previously considered represents a polyphyletic grouping, i.e., not all members derived from a single common ancestor.

The genus name Devario was suggested for the larger species with Danio being applied only to the smaller fish, although Kottelat (2013) later restricted Danio to its type species, D. dangila, and placed most former members in the revalidated genera Brachydanio and Celestichthys. Kullander (2015), the Catalog of Fishes and FishBase do not follow that split and keep those species in Danio.

These results have largely been supported by subsequent phylogenetic analyses (e.g. Mayden et al., 2007), although Devario has still undergone a little reshuffling, particularly following Fang et al. (2009) and Kottelat (2013).

In the former study the two species previously comprising the genus Inlecypris were brought into synonymy with Devario and three species formerly included in Microrasbora were moved into the new genus Microdevario based on possession of shared synapomorphies with Devario. The existence of a monophyletic clade consisting of the genera Devario, Chela, Laubuca, Microdevario and Microrasbora was also hypothesised, a theory upheld in the more recent study by Tang et al. (2010). The genus Betadevario (Pramod et al., 2010)[7] is also nested within this grouping and is sister to Devario and Microrasbora.

Kottelat (2013) revalidated the genus Inlecypris whilst noting that phylogenetic evidence suggests the existence of two genetic lineages within Devario. The first contains the species with prominent lateral stripes, which leaves the remaining members (D. apogon and D. chrysotaeniatus) of uncertain taxonomic placement. In addition, a number of the striped species share a colour pattern comprising a midlateral stripe on the posterior half of the body with a few bars in the anterior portion and golden patches between them. These may eventually be placed in a separate genus for which the name Parabarilius is available.

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References

9 on this profile

Name

Scientific name

Described by

Family

Common names

Photograph credits

Summary

Size and aquarium

Maximum size

Aquarium size

Water

Water conditions

Hardness

Conductivity

Behaviour

Temperament

Social needs

Community suitability

Where it lives

Countries, regions, rivers and lakes

Writing

Etymology

Distribution

Habitat

Aquarium size

Maintenance

Water conditions

Diet

Behaviour and compatibility

Sexual dimorphism

Reproduction

Notes

References

References