Zenarchopteridae: Difference between revisions
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Viviparous halfbeaks are more predatory than the marine species, and typically orient themselves into the current and take aquatic insect [[larva]]e, such as [[midge]] larvae, and small [[insect]]s, such as [[fly|flies]] that have fallen on the surface of the water, particularly [[mosquito]]es and [[spider]]s.<ref name="Hoedeman">{{ |
Viviparous halfbeaks are more predatory than the marine species, and typically orient themselves into the current and take aquatic insect [[larva]]e, such as [[midge]] larvae, and small [[insect]]s, such as [[fly|flies]] that have fallen on the surface of the water, particularly [[mosquito]]es and [[spider]]s.<ref name="Hoedeman">{{ |
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cite book|last=Hoedeman|first=J.|title=Naturalist's Guide to Freshwater Aquarium Fish|publisher=[[Elsevier]]|pages=724–729|year=1974|isbn=0-8069-3722-X}}</ref><ref>{{ |
cite book|last=Hoedeman|first=J.|title=Naturalist's Guide to Freshwater Aquarium Fish|publisher=[[Elsevier]]|pages=724–729|year=1974|isbn=0-8069-3722-X}}</ref><ref>{{ |
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cite web|url=http://www.ecologyasia.com/verts/fresh-fishes/forest-halfbeak.htm|title=Forest Halfbeak|publisher=EcologyAsia|accessdate=2006-09-03 |archiveurl = http://web.archive.org/web/20060507200524/http://www.ecologyasia.com/verts/fresh-fishes/forest-halfbeak.htm |archivedate = May 7, 2006}}</ref><ref>{{ |
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==Breeding== |
==Breeding== |
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As with other livebearing fish, fresh and brackish water halfbeaks produce small broods of large offspring compared with egg-laying species of similar size, with broods of around ten to twenty, typically {{convert|10|–|15|mm|in|sp=us}} long.<ref name="keepnbreed">{{ |
As with other livebearing fish, fresh and brackish water halfbeaks produce small broods of large offspring compared with egg-laying species of similar size, with broods of around ten to twenty, typically {{convert|10|–|15|mm|in|sp=us}} long.<ref name="keepnbreed">{{ |
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}}|title=Keeping & Breeding Halfbeaks|accessdate=2006-09-03}}</ref> |
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===Sexual dimorphism=== |
===Sexual dimorphism=== |
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To be kept successfully, halfbeaks require an aquarium with plenty of space at the surface. Depth is not critical, so a wide tank is better than a deep one. They are sensitive to low [[oxygen saturation|oxygen levels]] but are otherwise relatively hardy, except that they are intolerant of sudden changes in [[salinity]], [[pH]], [[hard water|hardness]], or [[temperature]]. Consequently, they must be introduced to a new aquarium gently, and small but frequent water changes are best, so the water chemistry does not change suddenly.<ref>{{ |
To be kept successfully, halfbeaks require an aquarium with plenty of space at the surface. Depth is not critical, so a wide tank is better than a deep one. They are sensitive to low [[oxygen saturation|oxygen levels]] but are otherwise relatively hardy, except that they are intolerant of sudden changes in [[salinity]], [[pH]], [[hard water|hardness]], or [[temperature]]. Consequently, they must be introduced to a new aquarium gently, and small but frequent water changes are best, so the water chemistry does not change suddenly.<ref>{{ |
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}}|title=Halfbeaks|first=Roger|last=Fischer|date=January–February 1994|publisher=Aqua News|accessdate=2006-09-03 |archiveurl = http://web.archive.org/web/20071011213018/{{cite web |
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⚫ | }} |archivedate = October 11, 2007}}</ref> A few species, most notably ''Dermogenys pusillius'', have traditionally been kept in slightly [[brackish]] water, though some authors aver that those found in brackish water are estuarine juveniles.<ref name="SchaferBWF"/><ref name="MonksBWF"/> Most traded species of ''Nomorhamphus'' and ''Hemirhamphodon'' prefer soft, neutral to slightly acidic, fresh water conditions.<ref name="keepnbreed"/><ref>{{ |
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cite journal|last=Monks|first=Neale|title=Life at the Top|journal=[[Tropical Fish Hobbyist]]|date=November 2006}}</ref> |
cite journal|last=Monks|first=Neale|title=Life at the Top|journal=[[Tropical Fish Hobbyist]]|date=November 2006}}</ref> |
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Halfbeaks breed in captivity, but despite being [[Live-bearing aquarium fish|livebearers]] not easily.<ref name="keepnbreed"/> Miscarriages are common, particularly if the females are stressed (for example, by being moved to another aquarium). Once the fry have been born, the large babies eat newly hatched [[brine shrimp]], small live foods such as [[daphnia]], and powdered [[fish flake|flake]].<ref>{{ |
Halfbeaks breed in captivity, but despite being [[Live-bearing aquarium fish|livebearers]] not easily.<ref name="keepnbreed"/> Miscarriages are common, particularly if the females are stressed (for example, by being moved to another aquarium). Once the fry have been born, the large babies eat newly hatched [[brine shrimp]], small live foods such as [[daphnia]], and powdered [[fish flake|flake]].<ref>{{ |
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==Conservation status== |
==Conservation status== |
Revision as of 10:34, 21 July 2016
Zenarchopteridae | |
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Female Dermogenys sumatrana a day or so before giving birth. | |
Scientific classification | |
Kingdom: | |
Phylum: | |
Class: | |
Order: | |
Family: | Zenarchopteridae Fowler, 1934
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Genera[1] | |
Zenarchopteridae, the viviparous halfbeaks, is a family in the order Beloniformes. The Zenarchopteridae exhibit strong sexual dimorphism, practicing internal fertilisation, and in some cases ovoviviparous or viviparous (the family also includes oviparous species).[2][3] The members in the family are mainly found in fresh and brackish water of tropical Asia and New Guinea, but the genus Zenarchopterus also includes marine species from the Indo-Pacific. Several, such as the wrestling halfbeak, have become commonly traded aquarium fish.[4]
Behaviour
Viviparous halfbeaks vary in social behavior from open water schooling fish similar to the marine halfbeaks (family Hemiramphidae), as with species of Zenarchopterus,[5] through to much more aggressive and combative fishes, as is best known from the "wrestling" halfbeaks of genus Dermogenys.[6] These non-schoolers prefer to lurk among aquatic plants such as reeds, dead trees, and artificial structures of various types; from where they wait for small prey animals to drift by or alight on the surface, before darting from their hiding place to hunt.[7] Notably, they feed extensively on female mosquitoes that are laying their eggs in the water, making them much better at mosquito control that species like guppies and mosquitofish that only take mosquito larvae.[7]
Feeding
Viviparous halfbeaks are more predatory than the marine species, and typically orient themselves into the current and take aquatic insect larvae, such as midge larvae, and small insects, such as flies that have fallen on the surface of the water, particularly mosquitoes and spiders.[7][8][9]
Breeding
![](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Halfbeak_fry.jpeg/250px-Halfbeak_fry.jpeg)
Members of the genus Zenarchopterus and presumably the poorly-known Tondanichthys are oviparous.[2]
The fresh and brackish water halfbeaks of the genera Dermogenys, Hemirhamphodon, and Nomorhamphus are all livebearers (with the exception of the oviparous H. tengah[3]), that is, they produce well-developed free-swimming young. However, there is a great deal of variation in the details. Meisner and Burns identified no fewer than five distinct modes of viviparity and ovoviparity in fresh and brackish water halfbeaks:[10]
Type | Egg location | Superfetation (sperm storage) | Yolk sac | Maternal connection | Broods per mating | Example | Notes |
---|---|---|---|---|---|---|---|
1 | ovarian follicle | No | Large | None | - | Southeast Asian populations of Dermogenys pusilla | |
2 | ovarian follicle | Yes | Small | via the coelomic cavity and pericardial sac | 3 | Dermogenys pusilla from Sabah and Dermogenys orientalis | |
3 | ovarian follicle, briefly, then along full ovary length | Yes | Small | Via expanded belly sac | 2 | Dermogenys viviparus | |
4 | ovarian follicle, briefly, then along full ovary length | No | Large | No | Nomorhamphus megarrhamphus, Nomorhamphus weberi, and Nomorhamphus towoetii | ||
5 | ovarian follicle, briefly, then along full ovary length | Yes | Small | Partial | Nomorhamphus ebrardtii | Late-stage embryos are oophagous (eating eggs and small embryos)[10] like sharks and a few other fishes. |
As with other livebearing fish, fresh and brackish water halfbeaks produce small broods of large offspring compared with egg-laying species of similar size, with broods of around ten to twenty, typically 10–15 millimeters (0.39–0.59 in) long.[11]
Sexual dimorphism
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Labelled_H_pogonognathus.jpg/250px-Labelled_H_pogonognathus.jpg)
Sexual dimorphism is apparent in some species. Males of the ovoviviparous and viviparous species all have a modified anal fin, the andropodium, similar to the gonopodium of poecilid livebearers, used to deliver sperm to the females.[7] Although most egg laying species mate by shedding the milt externally, as is typical for bony fish, at least some practice internal fertilization: male Zenarchopterus use a modified anal fin to direct sperm into the genital opening of the female prior to spawning.[12]
Besides modifications to the anal fin, other differences include size, coloration, and the beak's length or shape. Female Normorhamphus are much larger than males but aren't as brightly colored and have shorter beaks.[13] By contrast, male Hemirhamphodon are larger than females, and some species, such as Hemirhamphodon pogonognathus, also have a long beard-like tassel on the end of the beak.[14] Small colored patches, particularly among males, are only found on the fins and the tip of the beak.[13]
Gambling
They are small and generally peaceful towards other species, although males can be aggressive to one another.[11] Dermogenys pusillius, the wrestling halfbeak, in particular fight vigorously. Battles may end in injuries. In some Asian countries gamblers bet on the outcomes, as they do with Siamese fighting fish.[6][15]
In the aquarium
Some of the fresh and brackish water species are kept as ornamental aquarium fish,[16] particularly genera Dermogenys and Nomorhamphus, but also Hemirhamphodon and Zenarchopterus, less commonly.[5][14][17][18]
To be kept successfully, halfbeaks require an aquarium with plenty of space at the surface. Depth is not critical, so a wide tank is better than a deep one. They are sensitive to low oxygen levels but are otherwise relatively hardy, except that they are intolerant of sudden changes in salinity, pH, hardness, or temperature. Consequently, they must be introduced to a new aquarium gently, and small but frequent water changes are best, so the water chemistry does not change suddenly.[19] A few species, most notably Dermogenys pusillius, have traditionally been kept in slightly brackish water, though some authors aver that those found in brackish water are estuarine juveniles.[5][16] Most traded species of Nomorhamphus and Hemirhamphodon prefer soft, neutral to slightly acidic, fresh water conditions.[11][20]
Halfbeaks are sensitive and shocks like sudden changes in illumination can evoke frantic swimming activity. They may crash into the glass, injuring their beaks, or jump out of the tank. Such beak injuries usually heal within a few weeks. They will eat insect larvae such as bloodworms readily, as well as crustacean eggs, shrimp, fruit flies, and small pieces of chopped white fish. Halfbeaks sometimes eat flake foods as well. Some aquarists also offer them tiny pieces of algae wafer on the basis that most species are omnivorous in the wild, and so plant food probably suits them.[21]
Halfbeaks breed in captivity, but despite being livebearers not easily.[11] Miscarriages are common, particularly if the females are stressed (for example, by being moved to another aquarium). Once the fry have been born, the large babies eat newly hatched brine shrimp, small live foods such as daphnia, and powdered flake.[22]
Conservation status
![]() | This section needs to be updated.(July 2014) |
A small number of fresh water halfbeaks are listed in various categories on the IUCN Red List assessing their risk of extinction. None of these species are traded as aquarium fish. Most are simply rare in the wild, and consequently at particular risk from habitat destruction. Several species are listed as Data Deficient (and many have not been rated at all), meaning that their present status is unclear based on available information.
- Dermogenys megarramphus – Lower Risk, Near Threatened[23]
- Dermogenys weberi – Vulnerable[24]
- Nomorhamphus celebensis – Data Deficient[25]
- Nomorhamphus towoeti – Vulnerable[26]
- Tondanichthys kottelati – Vulnerable[27]
- Zenarchopterus alleni – Data Deficient[28]
References
- ^ Froese, Rainer; Pauly, Daniel (eds.). "Family Zenarchopteridae". FishBase. June 2013 version.
- ^ a b Berra, T.M. (2001). Freshwater Fish Distribution. p. 320. ISBN 978-0-12-093156-9
- ^ a b Tan, H.H. & Lim, K.K.P. (2013). Three new species of freshwater halfbeaks (Teleostei: Zenarchopteridae: Hemirhamphodon) from Borneo. The Raffles Bulletin of Zoology 61(2): 735–747.
- ^ Collette, Bruce B. (February 2004). "Family Hemiramphidae Gill 1859 – Halfbeaks" (PDF). California Academy of Sciences Annotated Checklist of Fishes.
- ^ a b c Schäfer, Frank (2005). Brackish Water Fishes. Aqualog. ISBN 3-936027-82-X.
- ^ a b Sterba, G (1962). Freshwater Fishes of the World. Vista Books. p. 609.
- ^ a b c d Hoedeman, J. (1974). Naturalist's Guide to Freshwater Aquarium Fish. Elsevier. pp. 724–729. ISBN 0-8069-3722-X.
- ^ %5bhttp://web.archive.org/web/20090203132148/http://ecologyasia.com:80/verts/fresh-fishes/forest-halfbeak.htm "Archived copy"%5d. Archived from %5bhttp://www.ecologyasia.com/verts/fresh-fishes/forest-halfbeak.htm the original%5d on February 3, 2009. Retrieved September 6, 2013.
{{%5b%5bTemplate:cite web|cite web%5d%5d}}
: Unknown parameter|deadurl=
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suggested) (%5b%5bHelp:CS1 errors#parameter_ignored_suggest|help%5d%5d)CS1 maint: archived copy as title (%5b%5b:Category:CS1 maint: archived copy as title|link%5d%5d)%5b%5bCategory:CS1 errors: unsupported parameter%5d%5d%5b%5bCategory:CS1 maint: archived copy as title%5d%5d "Forest Halfbeak". EcologyAsia. Archived from ["Archived copy". Archived from the original on February 3, 2009. Retrieved September 6, 2013.{{cite web}}
: Unknown parameter|deadurl=
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value (help); Check|url=
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at position 43 (help); templatestyles stripmarker in|url=
at position 1 (help) - ^ %5bhttp://web.archive.org/web/20060507201357/http://www.ecologyasia.com/verts/fresh-fishes/pygmy-halfbeak.htm "Archived copy"%5d. Archived from %5bhttp://www.ecologyasia.com/verts/fresh-fishes/pygmy-halfbeak.htm the original%5d on May 7, 2006. Retrieved September 3, 2006.
{{%5b%5bTemplate:cite web|cite web%5d%5d}}
: Unknown parameter|deadurl=
ignored (|url-status=
suggested) (%5b%5bHelp:CS1 errors#parameter_ignored_suggest|help%5d%5d)CS1 maint: archived copy as title (%5b%5b:Category:CS1 maint: archived copy as title|link%5d%5d)%5b%5bCategory:CS1 errors: unsupported parameter%5d%5d%5b%5bCategory:CS1 maint: archived copy as title%5d%5d "Pygmy Halfbeak". EcologyAsia. Archived from ["Archived copy". Archived from the original on May 7, 2006. Retrieved September 3, 2006.{{cite web}}
: Unknown parameter|deadurl=
ignored (|url-status=
suggested) (help)CS1 maint: archived copy as title (link) the original] on May 7, 2006. Retrieved 2006-09-03.{{cite web}}
: Check|archiveurl=
value (help); Check|url=
value (help); templatestyles stripmarker in|archiveurl=
at position 43 (help); templatestyles stripmarker in|url=
at position 1 (help) - ^ a b Meisner, A; Burns, J (1997). "Viviparity in the Halfbeak Genera Dermogenys and Nomorhamphus (Teleostei: Hemiramphidae)". Journal of Morphology. 234 (3): 295–317. doi:10.1002/(SICI)1097-4687(199712)234:3<295::AID-JMOR7>3.0.CO;2-8.
- ^ a b c d ["Archived copy". Archived from the original on January 28, 2008. Retrieved September 3, 2006.
{{cite web}}
: Unknown parameter|deadurl=
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suggested) (help)CS1 maint: archived copy as title (link) "Keeping & Breeding Halfbeaks"]. Retrieved 2006-09-03.{{cite web}}
: Check|url=
value (help); templatestyles stripmarker in|url=
at position 1 (help) - ^ Kottelat, M; Lim, K (1999). "Mating Behaviour of Zenarchopterus gilli and Zenarchopterus buffonis and Function of the Modified Dorsal and Anal Fin Rays in Some Species of Zenarchopterus (Teleostei: Hemiramphidae)". Copeia. 1999 (4): 1097–1101. doi:10.2307/1447985. JSTOR 1447985.
- ^ a b Riehl, R; Baensch, H (1996). Aquarium Atlas (vol. 1). Voyageur Press. ISBN 3-88244-050-3.
- ^ a b Riehl, R; Baensch, H (1997). Aquarium Atlas (vol. 2). Microcosm Ltd. ISBN 1-890087-06-8.
- ^ "Freshwater Fishes and the Singaporean". Retrieved 2007-01-25.
- ^ a b Monks, Neale (editor) (2006). Brackish Water Fishes. Neptune City, N.J.: T.F.H. ISBN 0-7938-0564-3.
{{cite book}}
:|first=
has generic name (help);|journal=
ignored (help) - ^ Schäfer, F; Kemkes, M. (1998). All Livebearers and Halfbeaks. Aqualog. ISBN 3-931702-77-4.
- ^ Dawes, J (1995). Livebearing Fishes: A Guide To Their Aquarium Care, Biology and Classification. Blandford. ISBN 0-7137-2592-3.
- ^ Fischer, Roger (January–February 1994). %5bhttp://web.archive.org/web/20071011213018/http://www.mn-aquarium.org/articles/masart23.htm "Archived copy"%5d. Archived from %5bhttp://www.mn-aquarium.org/articles/masart23.htm the original%5d on October 11, 2007. Retrieved September 6, 2013.
{{%5b%5bTemplate:cite web|cite web%5d%5d}}
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suggested) (%5b%5bHelp:CS1 errors#parameter_ignored_suggest|help%5d%5d)CS1 maint: archived copy as title (%5b%5b:Category:CS1 maint: archived copy as title|link%5d%5d)%5b%5bCategory:CS1 errors: unsupported parameter%5d%5d%5b%5bCategory:CS1 maint: archived copy as title%5d%5d "Halfbeaks". Aqua News. Archived from ["Archived copy". Archived from the original on October 11, 2007. Retrieved September 6, 2013.{{cite web}}
: Unknown parameter|deadurl=
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suggested) (help)CS1 maint: archived copy as title (link) the original] on October 11, 2007. Retrieved 2006-09-03.{{cite web}}
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value (help); Check|url=
value (help); templatestyles stripmarker in|archiveurl=
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at position 1 (help) - ^ Monks, Neale (November 2006). "Life at the Top". Tropical Fish Hobbyist.
- ^ Monks, Neale (October 2005). "Straight to the point: the Beloniformes". Practical Fishkeeping.
- ^ Blewett, Earl. ["Archived copy" (PDF). Archived from the original (PDF) on December 29, 2009. Retrieved September 6, 2013.
{{cite web}}
: Unknown parameter|deadurl=
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suggested) (help)CS1 maint: archived copy as title (link) "Dermogenys pusillus - The Wrestling Halfbeak Livebearer"] (PDF). Retrieved 2006-09-03.{{cite web}}
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- ^ Template:IUCN2006
- ^ Template:IUCN2006
- ^ Template:IUCN2006
- ^ Template:IUCN2006
- ^ Template:IUCN2006