Edit Danio feegradei

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Name

Scientific name

Danio feegradei

Described by

Authority Hora, Year 1937

Family

Cyprinidae

Common names

Yoma Danio

Photograph credits

All 9 credited

Summary

The Yoma danio, Danio feegradei, is a cyprinid considered endemic to the western slopes of the Rakhine Yoma in western Myanmar. Seen in the…

Size and aquarium

Maximum size

60mm, standard length

Aquarium size

Minimum length 120 cm, Minimum depth 45 cm

Water

Water conditions

Temperature 18–25°C, pH 6.5–7.5

Hardness

2–12dGH

Conductivity

Not recorded

Behaviour

Temperament

Not recorded

Community suitability

Community-safe

Where it lives

Countries, regions, rivers and lakes

Myanmar, Yan Khaw Chaung

Writing

Etymology

Danio: from Dhani, a Bengalese vernacular term for small, minnow-like cyprinids. feegradei: in honour of Lieutenant E. S. Feegrade, malariologist and Public He…

Distribution

Currently considered endemic to the Rakhine Yoma/Arakan mountains in Rakhine state, western Myanmar; this range forms a natural barrier which cuts the state of…

Habitat

Typically inhabits small forest streams. In the Yan Khaw Chaung (Yan Khaw stream) it occurs alongside Devario xyrops, Garra rakhinica, G. vittatula, Xenentodon…

Aquarium size

Even a small group needs an aquarium with base measurements of 120 ∗ 45 cm or more.

Maintenance

Looks particularly effective in a heavily-planted arrangement with a darker substrate, and may appear paler in sparsely-decorated set-ups. We suggest maintaini…

Water conditions

Not written yet

Diet

Probably preys on insects and their larvae in nature. In the aquarium it's largely an unfussy feeder and will accept most foods. A good quality dried product o…

Behaviour and compatibility

Not an aggressive fish but may upset very slow-moving or timid tankmates with its constant activity and vigorous feeding behaviour so can only be considered ap…

Sexual dimorphism

Mature males are the more colourful and noticeably slimmer sex plus they have orange, as opposed to white in females, edges to the ventral and anal fins. In gr…

Reproduction

Like most cyprinids this species is an egg-scattering spawner that exhibits no parental care. That is to say when the fish are in good condition they will spaw…

Notes

This species was first seen in the hobby around 2005 and has been available on a sporadic basis since, often under alternative names such as 'Danio sp. Yoma', …

This species was first seen in the hobby around 2005 and has been available on a sporadic basis since, often under alternative names such as 'Danio sp. Yoma', 'D. sp. gold laser' and 'D. sp. rocket'.

It is quite variable in patterning, especially in terms of the spot-like markings on the flanks which some specimens lack entirely.

There is another Danio sp. from Rakhine known in the trade as 'Danio sp. TW01' that may represent an undescribed species but could equally turn out to be a colour form of D. feegradei. It has a barred, as opposed to spotted, patterning on the body and is a bit smaller in size.

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) Danio spp. are characterised by the presence of an A stripe on the anal-fin and two or more P stripes on the caudal, plus some internal characteristics such as enlarged nasal lamellae.

The genus has undergone some significant taxonomic reshuffling in recent years following the publication of a series of phylogenetic studies.

Older, molecular, phylogenies tended to agree that it 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 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 (with the exception of the type species, D. dangila which can grow to around 89 mm3.5 in SL). Recent molecular studies by Mayden et al. (2007) and Fang et al. (2009) resulted in further changes, with the latter study considering the genus Danio to be composed of three subclades. These were subsequently split into distinct genera by Kottelat (2013), as follows:

The former species D. erythromicron, D. margaritatus, D. choprae and D. flagrans were grouped together in the revalidated genus Celestichthys Roberts, 2007. These exhibit unique body patterning consisting of vertical bars (D. erythromicron, D. choprae, D. flagrans) or light spots (D. margaritatus) and possess either very short barbels or none at all.

Kottelat (2013) left only the type species, D. dangila, in Danio, separated on the basis of its larger size and the shape of the caudal-fin, which in adults is only slightly emarginate or even truncate in shape, a feature it shares only with Tinca tinca (the common tench) among other cyprinids.

The remaining species, of which D. rerio is thought to be the most ancient, were placed in the revalidated genus Brachydanio Weber & de Beaufort, 1916. Kullander (2015) did not follow this split, because phylogenetic analyses strongly support a single Danio in the sense of Fang (2003), with Devario a separate genus. The Catalog of Fishes and FishBase both keep all of these species in Danio.

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References

8 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