Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:166
Specimens with Sequences:218
Specimens with Barcodes:162
Species:28
Species With Barcodes:28
Public Records:143
Public Species:26
Public BINs:21
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Barcode data: Danio cf. kerri

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

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Statistics of barcoding coverage: Danio cf. kerri

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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Barcode data: Danio cf. dangila

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

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Statistics of barcoding coverage: Danio cf. dangila

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
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Barcode data: Danio cf. rerio

The following is a representative barcode sequence, the centroid of all available sequences for this species.


No available public DNA sequences.

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Statistics of barcoding coverage: Danio cf. rerio

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 1
Specimens with Barcodes: 1
Species With Barcodes: 1
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Barcode data

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Wikipedia

Danio

The Danio genus comprises many of the species of danionins familiar to aquarists. The common name "danio" is used for members of the genera Danio and Devario.

Taxonomy[edit]

The name "danio" comes from the Bengali name dhani, meaning "of the rice field". The native Bangla name for the fish is anju. The species Danio rerio was first described in the early 19th century by Francis Hamilton, a surgeon working for the British East India Company. About a century later (1916), the genus was split; the larger species into Danio and the smaller species, such as D. rerio, into the new Brachydanio.[1] In 1991, though, the two genera were recombined; most larger species formerly within the Danio genus, such as the giant danio, have now been reclassified into the Devario genus. Also, Brachydanio is now a junior synonym of Danio.[2]

Species[edit]

The 21 currently recognized species in this genus are: [3][4][5]

These varieties are recognized in the aquarium trade, but are not considered valid species.

Some undescribed species or varieties, which may be represented by recently described species above, include:

Characteristics[edit]

They are native to the fresh water rivers and streams of Southeast Asia, but many species are brightly colored, and are available as aquarium fish worldwide. A number of the species, only recently discovered in remote inland areas of Myanmar, do not yet have scientific names.

They have two pairs of long barbels, and are generally characterised by horizontal stripes (with the exception of the glowlight danio, panther danio and black barred danio which have vertical bars). They range from 4–15 cm (1.75–6 in) in length. They generally do not live for more than two to three years, and are probably annual fish in the wild.

In the wild, these fish consume various small aquatic insects, crustaceans, and worms, as well as plankton in the case of fry.

In the aquarium[edit]

The care of members of the genus Danio is rather similar and easily generalized. They are easy to keep.

All of these fish are primarily surface feeders. They are omnivorous in the aquarium and will accept a wide variety of foods, though flake food is appropriate. Living in aquaria, live/frozen flaked foods are suitable, especially brine shrimp and sinking tablets. Danios are voracious eaters; timid feeders may starve in community tanks with danios. When conditioning danios for breeding, it is advisable to feed them plenty of fresh foods.

Although boisterous and liable to chase each other and other fish, they are good community fish and will not generally attack each other or other fish, although they occasionally nip fins, more by accident than design; like most fish, they will eat eggs and any fish small enough to fit into their mouths.

They are best kept in a tank long enough for their active swimming, preferably with a current from a power filter (or at least airstone) as they often live in fast-flowing streams in the wild. Generally, this also results in them being subtropical with cooler temperatures. They are good jumpers, so a tight-fitting lid is recommended.

As a schooling fish, they prefer to be in groups of six or more. Danios prefer water with a pH between 6.0 and 8.0, hardness no more than 19.0 dGH, a carbon hardness of 8 to 12 KH, and a temperature range of 68–80°F (20–26°C); the lower end of the temperature range is ideal.

Breeding[edit]

Some species of Danio, such as the zebra danio, are among the easiest aquarium fish to breed. Other species, such as Danio kyathit, are far harder to spawn. All scatter their eggs over the substrate. The eggs are not adhesive, and hatch within two or three days. Eggs will be eaten enthusiastically unless protected by a layer of marbles or heavy substrate planting.

Hybrids between some Danio species have been bred; the young can be raised to maturity, but are sterile.

See also[edit]

  • Danionins - full details of all fish related to the Danios, including those species known as danios which are no longer scientifically classified in the Danio genus
  • Devarios - details of the species within the genus Devario

References[edit]

  1. ^ Spence, Rowena and Gabriele Gerlach, Christian Lawrence and Carl Smith (2007). "The behaviour and ecology of the zebrafish, Danio rerio" (PDF). Biological Reviews for the Cambridge Philosophical Society 83 (1): 13–34. doi:10.1111/j.1469-185X.2007.00030.x. PMID 18093234. 
  2. ^ Fang, Fang; Douglas, M. E. (2003). Douglas, M. E., ed. "Phylogenetic Analysis of the Asian Cyprinid Genus Danio (Teleostei, Cyprinidae)". Copeia 2003 (4): 714–728. doi:10.1643/IA03-131.1. 
  3. ^ Froese, Rainer, and Daniel Pauly, eds. (2012). Species of Danio in FishBase. June 2012 version.
  4. ^ a b Nguyen, V.H., Nguyen, T.H. & Mua, B.C. (2010): A new fish species of the Danio Hamilton, 1822 that was found in the Ky Son district, the Northern Central province of Nghe An, Vietnam. Vietnam Journal of Biology, 32 (4): 62-68.
  5. ^ a b Kullander, S.O. (2012): Description of Danio flagrans, and redescription of D. choprae, two closely related species from the Ayeyarwaddy River drainage in northern Myanmar (Teleostei: Cyprinidae). Ichthyological Exploration of Freshwaters, 23 (3): 245-262.
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Redfin danio


The redfin danio resembles a zebra danio with blood-red fins. It may be a colour morph of the orange-finned zebra danio, Danio kyathit


See also[edit]

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Burma zebra danio

The Burma zebra danio or KP01 danio is a tropical fish belonging to the minnow family (Cyprinidae). It is believed to originate in Myanmar. This fish was discovered in 2006 and is believed to be a separate species from the zebra danio (which occurs many miles away in India) to which it has a close resemblance. However, it is more likely to be closely related to the Yoma danio (also from Myanmar), and is believed to be a similar size, 6-9 cm, to the latter.

In the wild, the Burma zebra danio is likely found in rivers in a tropical climate and prefer water with a 6.5 - 7.0 pH, a water hardness of 5.0 - 12.0 dGH, and an ideal temperature range of 75-82°F (24-28°C). The Burma zebra danio is oviparous (an egg layer).

See also[edit]

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Hikari danio


The Hikari danio is a new species of danio recently discovered in Burma, and first exported in 2002/2003. It is still awaiting a scientific name, and is temporarily referred to as Danio sp. "Hikari". It has blue and yellow varieties with the yellow being male and the blue female. It appears to be closely related to Danio kerri. It may be a subspecies of this fish, but this does not seem to be the case.


  • Maximum length: 2 in (5 cm)
  • Colors: Blue, silver, yellow
  • Temperature preference: 20-25°C
  • pH preference: 6 to 7
  • Hardness preference: Soft to medium
  • Salinity preference: Low to medium
  • Compatibility: Good but fast, like most danios
  • Lifespan: Typically two to three years
  • Ease of keeping: Moderate
  • Ease of breeding: Moderate to hard


See also[edit]

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