{{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 | 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, 1801 }}
The '''opalfish''' ('''''Hemerocoetes monopterygius'''''; {{langx|mi|kohikohi}})<ref>{{Māori Dictionary|2794|Kohikohi}}</ref> is a ray-finned fish of the genus ''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, ''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
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