# Opalfish

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> Source: https://en.wikipedia.org/wiki/Opalfish
> Source revision: 1341812322
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Species of ray-finned fish}}
{{Use New Zealand English|date=July 2024}}
{{Speciesbox 
| name = Opalfish
| image = Hemerocoetes monopterygius 2019-07 (4) (cropped).jpg
| image_caption = An opalfish observed in the [Wellington Harbour](/source/Wellington_Harbour)
| status = LC
| status_system = IUCN3.1
| status_ref = <ref name = IUCN>{{cite iucn | author1 = Nelson, J. | author2 = Matsuura, K. | author3 = Collette, B. | author4 = Dooley, J. | author5 = Fritzsche, R. | author6 = Carpenter, K. | author7 = Roberts, C.  | year = 2010 | title = ''Hemerocoetes monopterygius'' |errata=2017 | volume = 2010 | article-number = e.T154636A115215793 | doi = 10.2305/IUCN.UK.2010-4.RLTS.T154636A4594312.en }}</ref>
| taxon = Hemerocoetes monopterygius
| authority = [Schneider](/source/Johann_Gottlob_Theaenus_Schneider), 1801
}} 

The '''opalfish''' ('''''Hemerocoetes monopterygius'''''; {{langx|mi|kohikohi}})<ref>{{Māori Dictionary|2794|Kohikohi}}</ref> is a [ray-finned fish](/source/ray-finned_fish) of the genus ''[Hemerocoetes](/source/Hemerocoetes)'', found only around New Zealand, at depths of between {{convert|5 and 200|m|ft}}. Their length is between {{convert|10 and 25|cm|in}}.

== Gallery ==
<Gallery>
File:Hemerocoetes monopterygius (Opalfish).gif|Drawing by Dr Tony Ayling
File:Hemerocoetes_monopterygius_2022-09_(3).jpg|An opalfish surrounded by shells
</gallery>

==References==
{{Reflist}}

* {{ITIS |id=171012 |taxon=Hemerocoetes monopterygius |accessdate=18 April 2006}}
* {{FishBase | genus = Hemerocoetes | species = monopterygius | month = January | year = 2006}}
* Tony Ayling & Geoffrey Cox, ''Collins Guide to the Sea Fishes of New Zealand'',  (William Collins Publishers Ltd, Auckland, New Zealand 1982) {{ISBN|0-00-216987-8}}
* [Wade Doak](/source/Wade_Doak), ''A Photographic Guide to Sea Fishes of New Zealand'', (New Holland Publishers (NZ) Ltd, Auckland, New Zealand 2003) {{ISBN|1-877246-95-6}}

{{Taxonbar|from=Q2754344}}

Category:Hemerocoetidae
Category:Endemic marine fish of New Zealand
Category:Fish described in 1801

{{Acropomatiformes-stub}}

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Adapted from the Wikipedia article [Opalfish](https://en.wikipedia.org/wiki/Opalfish) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Opalfish?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.