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Wrestling halfbeak
The wrestling halfbeak (''Dermogenys pusilla'') also known as Malayan halfbeak is a species of viviparous halfbeak native to the fresh and brackish waters of rivers and coastal regions in South-East Asia, in Singapore, Thailand, Indonesia, Thailand, Malaysia, Borneo and Sumatra. It is a small, slender, livebearing fish, with the elongated lower jaw characteristic of its family. The colour of this species varies, depending on where the specimen is found.〔Schäfer F & M. Kemkes: All Livebearers and Halfbeaks, Aqualog 1998, ISBN 3-931702-77-4〕
Wrestling halfbeaks are surface-feeding fish and feed on a variety of small invertebrates including crustaceans and insect larvae, but especially mosquito larvae and flying insects that have fallen onto the surface of the water. As with all halfbeaks, the upper jaw lifts upwards when the fish is opening its mouth. Wrestling halfbeaks are livebearing fish, the females giving birth to around twenty offspring after a gestation period of about a month.〔Meisner, A & Burns, J: Viviparity in the Halfbeak Genera ''Dermogenys'' and ''Nomorhamphus'' (Teleostei: Hemiramphidae). Journal of Morphology 234, pp 295-317, 1997〕〔(【引用サイトリンク】title=Keeping & Breeding Halfbeaks )〕〔(【引用サイトリンク】title=Dermogenys pusillus - The Wrestling Halfbeak Livebearer )〕
Wrestling halfbeaks are sexually dimorphic. The females are larger than the males and grow up to long; males only reach about and typically has red or yellow patches on the dorsal fin and the beak.〔Riehl R. & Baensch H: Aquarium Atlas (vol. 1), Voyageur Press, 1996, ISBN 3-88244-050-3〕〔Riehl R. & Baensch H: Aquarium Atlas (vol. 2), Microcosm Ltd, 1997, ISBN 1-890087-06-8〕 The males of wrestling halfbeaks will fight among themselves by locking jaws, hence their name, for up to thirty minutes.
==Fish fighting==
In the wild, and in large aquaria, the weaker male will quickly disengage and swim away, and fights therefore rarely result in serious injury to either party. However, in their native range, local people sometimes use wrestling halfbeaks as fighting fish for betting purposes (like fighting cocks or siamese fighting fish).〔(【引用サイトリンク】title=Freshwater Fishes and the Singaporean )〕〔Sterba, G: Freshwater Fishes of the World, p. 609, Vista Books, 1962〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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