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{{Short description|Species of fish}}
{{Speciesbox
| name = Blue-spotted jawfish
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| status = LC
| status_system = IUCN3.1
| status_ref = <ref name = IUCN>{{cite journaliucn | author1 = McCosker, J.E. | author2 = Acero, A. | author3 = Espinosa, H. | lastname-authorlist-amp style= yesamp | year = 2010 | tite title= ''Opistognathus rosenblatti'' (|errata version published in =2017) | journal = [[The IUCN Red List of Threatened Species]] | volume =2010 | page = e.T155269A115294092 | url doi= http://dx.doi.org/10.2305/IUCN.UK.2010-4.RLTS.T155269A4762175.en | accessdate = 25 October 2018}}</ref>
| genus = Opistognathus
| species = rosenblatti
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}}
 
The '''blue-spotted jawfish''' (''Opistognathus rosenblatti'') is a [[species]] of [[jawfish]] native to the [[Gulf of California]]. It is an inhabitant of [[reefs]] where it is found in large colonies at depths of around {{convert|12|m|ft}}. This species hides in its burrow at night, completely sealing the entrance. Every morning, it rebuilds the burrow entrance. It can reach a length of {{convert|10|cm|in}} [[fish measurement|TL]]. It can also be found in the [[aquarium]] trade.<ref name = tfh>{{Cite web | url = http://www.tfhmagazine.com/details/articles/a-cool-fish-in-more-than-one-sense-the-bluespotted-jawfish-opistognathus-rosenblatti-full-article.htm | title= A Cool Fish in More Than One Sense: The Blue-Spotted Jawfish ''Opistognathus rosenblatti'' (Fullfull Articlearticle) | author = Bob Fenner | accessdate access-date= 25 October 2018 | date = January 2012 | publisher = Tropical Fish Hobbyist Magazine}}</ref>
 
The blue-spotted jawfish was first discovered in the Tropical Eastern Pacific by Gerald Allen and David R. Robertson in 1991.<ref name = tfh/> Found in large colonies of California, they are colorful and beautiful member of the jawfish's family. They belong to the class of '''''Actinopterygii'''.''
 
==Description==
 
The blue-spotted jawfish have an electric -blue spotting over a yellow or orange body with an elegant yellow dorsal fin. They have large eyes that make them look as "alien".<ref name = saltwater>{{cite web | url = https://www.saltwaterfish.com/product-blue-spotted-jawfish | title = Blue Spotted Jawfish | accessdate access-date= 25 October 2018 | publisher = saltwaterfish.org}}</ref> The males have stark white in their anterior halves., theThe females and the non-courting males are dark brown and have larger blue spots,. theThe younger jawfish are uniformly colored yellow with blue spots.
 
==Biology==
Jawfish are named for their large mouths, which allow them to catch food. Their large mouths also allow them to dig their burrows by taking big mouthfuls of sand and spitting them out in order to create their hideaways.<ref name = bz>{{cite web | url = https://www.bluezooaquatics.com/resources.asp?show=385 | title = ''Opistognathus rosenblatti'' - Blue-Spotted JawfsihJawfish | accessdate access-date= 25 October 2018 | publisher = Blue Zoo Aquatics}}</ref> Some jawfish consume worms, crustaceans, and invertebrates, but the blue-spotted jawfish feeds on tiny animals: [[benthic]] and [[planktonic]] invertebrates. They are colonial species and can be found in quite large colonies.<ref name = FishBase>{{FishBase|Opistognathus|rosenblatti|month=June|year=2018}}</ref>▼
 
▲Jawfish are named for their large mouths, which allow them to catch food. Their large mouths also allow them to dig their burrows by taking big mouthfuls of sand and spitting them out in order to create their hideaways.<ref name = bz>{{cite web | url = https://www.bluezooaquatics.com/resources.asp?show=385 | title = Opistognathus rosenblatti - Blue-Spotted Jawfsih | accessdate = 25 October 2018 | publisher = Blue Zoo Aquatics}}</ref> Some jawfish consume worms, crustaceans, and invertebrates, but the blue-spotted jawfish feeds on tiny animals: benthic and planktonic invertebrates.
 
==Habitat==
The blue-spotted jawfish are very social amongst other members of its own species,. theyThey are not aggressive except to those who try to enter their burrows. They are found in cold water at deeper depth of the ocean in sandy rubbles and reef areas. They live in colonies of up to several hundred fish, with a minimal spacing of 1m {{cvt|1|to |3 |m|ft}} between individuals. They cover their burrow entrance at dusk and rebuiltrebuild the opening every morning. Unlike the ''[[Opistognathus aurifrons]]'', the blue-spotted jawfish only spend time out and above their burrows during the warm summer season.<ref name = tfh/>▼
 
▲The blue-spotted jawfish are very social amongst other members of its own species, they are not aggressive except to those who try to enter their burrows. They are found in cold water at deeper depth of the ocean in sandy rubbles and reef areas. They live in colonies of up to several hundred fish with a minimal spacing of 1m to 3 m between individuals. They cover their burrow entrance at dusk and rebuilt the opening every morning. Unlike the ''Opistognathus aurifrons'', the blue-spotted jawfish only spend time out and above their burrows during warm summer season.<ref name = tfh/>
 
==Health==
The blue-spotted jawfish have small scales but they do not carry parasitic infestations and infectious disease as the other fish family with small scales.<ref name = tfh/> TheyThere are two diseases that can affect the blue-spotted jawfish. First of all, the brooklynella[[Brooklynellosis]] and blue -spotted jawfish disease.<ref name = aquanerd>{{cite web | url= =http://aquanerd.com/2009/09/better-left-in-ocean-blue-spot-jawfish.html | title = Better Left in the Ocean – Blue Spot Jawfish | accessdate access-date= 25 October 2018 |date= publisherSep 2009 |publisher= AquaNerd}}</ref> When the blue -spotted jawfish are affected by the brooklynella''[[Brooklynella]]'', it is likely that they will deteriorate and die within approximately 24 hours. The symptoms of brooklynellaBrooklynellosis include: peeling skin and color loss all over the body, or no appetite. They may leave their burrow and list around until they eventually die.▼
 
Edit: Brookynella is easily treated in a quarantine tank using malachite green in combination with formalin.
▲The blue-spotted jawfish have small scales but they do not carry parasitic infestations and infectious disease as the other fish family with small scales.<ref name = tfh/> They are two diseases that can affect the blue-spotted jawfish. First of all, the brooklynella and blue spotted jawfish disease.<ref name = aquanerd>{{cite web | url =http://aquanerd.com/2009/09/better-left-in-ocean-blue-spot-jawfish.html | title = Better Left in the Ocean – Blue Spot Jawfish | accessdate = 25 October 2018 | publisher = AquaNerd}}</ref> When the blue spotted jawfish are affected by the brooklynella, it is likely that they will deteriorate and die within approximately 24 hours. The symptoms of brooklynella include: peeling skin and color loss all over the body, no appetite. They may leave their burrow and list around until they eventually die.
 
The so-called "Blue spot jawfish disease" is almost always damage to the fish caused by; rough handling, coarse or abrasive substrate, being kept on bare glass, or, from being kept at above 21c.
 
==Reproduction==
Jawfish are mouth brooders, they utilize their mouth to hold the eggs until they reach the hatching point. They incubate the eggs in their mouths for about 5 to 7 days. In addition, males display behaviorally and color -wise in the summer months by becoming bright white, dashing {{convert|3 |to |4 feet|ft}} above their burrow, trying to attract the females. If the male is successful attracting the female, then the female join his tube for a few minutes after returning in hers.<ref name = tfh/>▼
 
▲Jawfish are mouth brooders, they utilize their mouth to hold the eggs until they reach the hatching point. They incubate the eggs in their mouths for about 5 to 7 days. In addition, males display behaviorally and color wise in the summer months by becoming bright white, dashing 3 to 4 feet above their burrow trying to attract the females. If the male is successful attracting the female, the female join his tube for a few minutes after returning in hers.<ref name = tfh/>
 
==In the aquarium==
 
The blue-spotted Jawfish must be kept in 30 gallons or larger aquarium with tank mates.<ref name = aquanerd/> They must be kept with one specimen, or a mate pair per tank. As they are known to be jumpers, meaning they jump frequently and might escape easily. It is important to keep them in an aquarium with a lid or to take other measures to prevent the animal from harming itself. It is recommended that only advanced aquarists attempt to keep this particular fish due to its sensitivity to water parameters. Additionally, this fish does not handle shipping well, and many specimens die during and soon after the shipping process.
 
==Name==
The [[Specific name (zoology)|specific name]] honours [[Richard H. Rosenblatt]] (1930-2014), an [[Ichthyology|ichthyologist]] at the [[Scripps Institution of Oceanography]], who made many contributions to the study of the fishes of the eastern Pacific.<ref name = ETYFish>{{cite web | url = http://www.etyfish.org/ovalentaria/ | title = Subseries OVALENTARIA: ''Incertae sedis'' | accessdateaccess-date= 25 October 2018 | author1 = Christopher Scharpf | author2 = Kenneth J. Lazara | lastname-authorlist-amp style= yesamp | work = The ETYFish Project Fish Name Etymology Database | publisher = Christopher Scharpf and Kenneth J. Lazara | date = 29 March 2018}}</ref>
 
==References==
{{Reflist}}
 
==External links==
* {{SealifePhotos|276476}}
 
{{Taxonbar|from=Q2522333}}
 
[[Category:Opistognathus|Blue-spotted jawfish]]
[[Category:Taxa named by Gerald R. Allen]]
[[Category:Fish described in 1991]]
 
 
{{ray-finned fish-stub}}
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