Jonah's icefish: Difference between revisions
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'''Jonah's icefish''' (''Neopagetopsis ionah'') is a [[Benthopelagic fish|benthopelagic]] [[species]] of marine [[ray-finned fish]] belonging to the [[Family (biology)|family]] [[Channichthyidae]], the [[crocodile icefish]]es, it is the only member of the [[Monotypic taxon|monotypic]] genus ''Neopagetopsis''. It is found in the [[Southern Ocean]] at depths of from {{convert|20|to|900|m|ft}}. It has a circum-[[Antarctic]] distribution on the [[Continental margin|continental slope]] and [[continental shelf]], with the northernmost records from the [[South Shetland Islands|South Shetland]] and the [[South Orkney Islands]].<ref name=":0">{{Cite web|title=Neopagetopsis ionah, Jonah's icefish|url=https://www.fishbase.se/summary/7113|access-date=2020-12-11|website=www.fishbase.se}}</ref> |
'''Jonah's icefish''' (''Neopagetopsis ionah'') is a [[Benthopelagic fish|benthopelagic]] [[species]] of marine [[ray-finned fish]] belonging to the [[Family (biology)|family]] [[Channichthyidae]], the [[crocodile icefish]]es, it is the only member of the [[Monotypic taxon|monotypic]] genus ''Neopagetopsis''. It is found in the [[Southern Ocean]] at depths of from {{convert|20|to|900|m|ft}}. It has a circum-[[Antarctic]] distribution on the [[Continental margin|continental slope]] and [[continental shelf]], with the northernmost records from the [[South Shetland Islands|South Shetland]] and the [[South Orkney Islands]].<ref name=":0">{{Cite web|title=Neopagetopsis ionah, Jonah's icefish|url=https://www.fishbase.se/summary/7113|access-date=2020-12-11|website=www.fishbase.se}}</ref> |
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==Taxonomy== |
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Jonah's icefish was first formally [[Species description|described]] in 1947 by the Swedish ichthyologist {{ill|Orvar Nybelin|sv}} with the type locality given as near the [[Balleny Islands]], [[Ross Dependency]] in Antarctica.<ref name = CofF>{{Cof genus | genus = Neopagetopsis | access-date = 25 October 2021}}</ref> |
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This species has a dark blackish-green or black body. The well-developed [[Dorsal fin|dorsal fins]] and fan-shaped [[Pelvic fin|pelvic fins]] are blackish. Other fins may be dusky or blackish in color. The belly is whitish, however, those of juveniles may have irregular dark markings present. This species grows to a length of {{convert|56|cm|in}} [[Fish measurement|TL]]. Adults mainly feed on [[Fish|fishes]] ( including ''[[Dacodraco hunteri]], [[Chaenodraco wilsoni]], [[Pleuragramma antarcticum]]'' and ''[[Chionodraco]]'' sp.) and [[krill]], however, young specimens feed mainly on krill (mainly ''[[Euphausia superba]]''), and they are frequently caught along with their prey at 10 cm to 15 cm TL (3.9 to 5.9 inches TL). In the South Shetland Islands, both adults and juveniles show a marked preference for krill (only 3 out of 19 sampled specimens had consumed any kind of fish). <ref>{{Cite book|last1=Gon|first1=Ofer|title=Fishes of the Southern Ocean|last2=Heemstra|first2=Phillip C.|publisher=J.L.B. Smith Institute of Ichthyology|year=1990|location=Grahamstown, South Africa|pages=395–396}}</ref> |
This species has a dark blackish-green or black body. The well-developed [[Dorsal fin|dorsal fins]] and fan-shaped [[Pelvic fin|pelvic fins]] are blackish. Other fins may be dusky or blackish in color. The belly is whitish, however, those of juveniles may have irregular dark markings present. This species grows to a length of {{convert|56|cm|in}} [[Fish measurement|TL]]. Adults mainly feed on [[Fish|fishes]] ( including ''[[Dacodraco hunteri]], [[Chaenodraco wilsoni]], [[Pleuragramma antarcticum]]'' and ''[[Chionodraco]]'' sp.) and [[krill]], however, young specimens feed mainly on krill (mainly ''[[Euphausia superba]]''), and they are frequently caught along with their prey at 10 cm to 15 cm TL (3.9 to 5.9 inches TL). In the South Shetland Islands, both adults and juveniles show a marked preference for krill (only 3 out of 19 sampled specimens had consumed any kind of fish). <ref>{{Cite book|last1=Gon|first1=Ofer|title=Fishes of the Southern Ocean|last2=Heemstra|first2=Phillip C.|publisher=J.L.B. Smith Institute of Ichthyology|year=1990|location=Grahamstown, South Africa|pages=395–396}}</ref> |
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Revision as of 16:01, 25 October 2021
| Jonah's icefish | |
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| Drawing by J.C. Hureau | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Perciformes |
| Family: | Channichthyidae |
| Genus: | Neopagetopsis Nybelin, 1947 |
| Species: | N. ionah
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| Binomial name | |
| Neopagetopsis ionah Nybelin, 1947
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Jonah's icefish (Neopagetopsis ionah) is a benthopelagic species of marine ray-finned fish belonging to the family Channichthyidae, the crocodile icefishes, it is the only member of the monotypic genus Neopagetopsis. It is found in the Southern Ocean at depths of from 20 to 900 metres (66 to 2,953 ft). It has a circum-Antarctic distribution on the continental slope and continental shelf, with the northernmost records from the South Shetland and the South Orkney Islands.[1]
Taxonomy
Jonah's icefish was first formally described in 1947 by the Swedish ichthyologist Orvar Nybelin with the type locality given as near the Balleny Islands, Ross Dependency in Antarctica.[2]
This species has a dark blackish-green or black body. The well-developed dorsal fins and fan-shaped pelvic fins are blackish. Other fins may be dusky or blackish in color. The belly is whitish, however, those of juveniles may have irregular dark markings present. This species grows to a length of 56 centimetres (22 in) TL. Adults mainly feed on fishes ( including Dacodraco hunteri, Chaenodraco wilsoni, Pleuragramma antarcticum and Chionodraco sp.) and krill, however, young specimens feed mainly on krill (mainly Euphausia superba), and they are frequently caught along with their prey at 10 cm to 15 cm TL (3.9 to 5.9 inches TL). In the South Shetland Islands, both adults and juveniles show a marked preference for krill (only 3 out of 19 sampled specimens had consumed any kind of fish). [3]
This species has a more complete hemoglobin gene than other species of crocodile icefish; however, it is still nonfunctional.[4]
This species is the only known member of its genus. It is of no interest to commercial fisheries.[1]
References
- ^ a b "Neopagetopsis ionah, Jonah's icefish". www.fishbase.se. Retrieved 2020-12-11.
- ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Neopagetopsis". Catalog of Fishes. California Academy of Sciences. Retrieved 25 October 2021.
- ^ Gon, Ofer; Heemstra, Phillip C. (1990). Fishes of the Southern Ocean. Grahamstown, South Africa: J.L.B. Smith Institute of Ichthyology. pp. 395–396.
- ^ Near, Thomas J.; Parker, Sandra K.; Detrich, H. William (2006-11-01). "A Genomic Fossil Reveals Key Steps in Hemoglobin Loss by the Antarctic Icefishes". Molecular Biology and Evolution. 23 (11): 2008–2016. doi:10.1093/molbev/msl071. ISSN 0737-4038. PMID 16870682.