Ecology

Habitat

Depth range based on 4 specimens in 5 taxa.

Environmental ranges
  Depth range (m): 0.5 - 1

Graphical representation

Depth range (m): 0.5 - 1
 
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:264
Specimens with Sequences:223
Specimens with Barcodes:223
Species:3
Species With Barcodes:1
Public Records:173
Public Species:0
Public BINs:22
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Barcode data

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Wikipedia

Dermogenys

Dermogenys is a genus of viviparous halfbeaks. They are widely distributed in fresh and brackish water in South and Southeast Asia, ranging from India to the Philippines and Greater Sundas. They are all viviparous, producing small clutches of up to 30 fry that closely resemble the adults, except they are much smaller, around 1–1.5 cm (0.4–0.6 in) in length. Adults are typically around 6–7 cm (2.4–2.8 in) in length, with females being slightly larger than males. Males tend to be more brightly coloured and are well known for being aggressive towards one another. The wrestling halfbeak, D. pusilla, is widely used in Asia as fighting animals upon which wagers are placed (see Siamese fighting fish). Both sexes have lower jaws (mandibles) that are much longer than the upper ones, and from this comes the "halfbeak" name.

Dermogenys feed extensively on small insects, either in the form of aquatic larvae or as flying insects that have fallen onto the surface of the water. They are important predators on insects such as mosquitoes, so play a role in controlling malaria.

Reproduction[edit]

A three-week old Dermogenys fry.

Dermogenys are live-bearing fish that practise internal fertilisation. The male is equipped with a gonopodium-like anal fin known as an andropodium that delivers sperm into the female. The gestation period is about one month. The exact mode of reproduction ranges from ovoviviparity through to viviparity (see section on reproduction in the Zenarchopteridae article). About ten embryos are developed at any one time, but at birth, these are fairly large (around 1 cm or 0.4 in) compared with other fish of this size. Dermogenys adults are around 4–7 cm (1.6–2.8 in) in length, depending on the species.

Species[edit]

There are currently 12 recognized species in this genus: [1]

See also[edit]

Further reading[edit]

References[edit]

  1. ^ Froese, Rainer, and Daniel Pauly, eds. (2012). Species of Dermogenys in FishBase. June 2012 version.
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