Two-spined blackfish: Difference between revisions
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{{Taxobox |
{{Taxobox |
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| color = pink |
| color = pink |
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| name = Two-spined |
| name = Two-spined blackfish |
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| regnum = [[Animal]]ia |
| regnum = [[Animal]]ia |
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| phylum = [[Chordate|Chordata]] |
| phylum = [[Chordate|Chordata]] |
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The ''' |
The '''two-spined blackfish''', ''Gadopsis bispinosus'', is an [[Australia]]n native freshwater fish. It is a speciated, more specialised [[upland (freshwater ecology)|upland]] variant of the [[river blackfish]], ''Gadopsis marmoratus''. |
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It is found in the cool, clear, strong-flowing, cobble bottomed, sub-alpine rivers and streams (ranging from small to large) in the southeast corner of the [[Murray River|Murray]]-[[Darling River|Darling]] river system. Their range encompasses northeast [[Victoria (Australia)|Victoria]], southeast [[New South Wales]] and the [[Australian Capital Territory]]. Originally |
It is found in the cool, clear, strong-flowing, cobble bottomed, sub-alpine rivers and streams (ranging from small to large) in the southeast corner of the [[Murray River|Murray]]-[[Darling River|Darling]] river system. Their range encompasses northeast [[Victoria (Australia)|Victoria]], southeast [[New South Wales]] and the [[Australian Capital Territory]]. Originally two-spined blackfish co-inhabited many of these waters with [[Macquarie perch]] and [[trout cod]]. |
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Two-spined |
Two-spined blackfish are similar in shape and appearance to river blackfish, though their spiny [[dorsal fin]] usually contain only two spines (hence their scientific name) in comparison to river blackfish which have 7 to 13 distinguishable spines in their spiny dorsal fin. (In reality, this is a rather academic point as two-spined blackfish have blurred the difference between the dorsal spines and the dorsal rays that make up their soft dorsal fin, and any distinctions between the two weakly calcified dorsal spines and the dorsal rays that follow it are hard to pick in a living specimen). |
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It is much the same as the |
It is much the same as the river blackfish in spawning and diet, however rocks and the interstices (spaces) between them replace timber as the main spawning and habitat sites for two-spined blackfish, and two-spined blackfish are much smaller, commonly 15 to 17 cm and a maximum size of 25 cm. |
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The species suffers serious predation and competition from introduced species of [[trout]] but due its nocturnal habits and cryptic, cover-oriented behaviour it appears to survive in sufficient numbers to maintain populations. |
The species suffers serious predation and competition from introduced species of [[trout]] but due its nocturnal habits and cryptic, cover-oriented behaviour it appears to survive in sufficient numbers to maintain populations. |
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==External links== |
==External links== |
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*[http://www.nativefish.asn.au/2spnblkf.html Native Fish Australia - Two-Spined Blackfish page] |
* [http://www.nativefish.asn.au/2spnblkf.html Native Fish Australia - Two-Spined Blackfish page] |
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[[Category:Percichthyidae]] |
[[Category:Percichthyidae]] |
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Revision as of 18:37, 18 November 2006
| Two-spined blackfish | |
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| Scientific classification | |
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| Species: | G. bispinosus
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| Binomial name | |
| Gadopsis bispinosus Sanger, 1984
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The two-spined blackfish, Gadopsis bispinosus, is an Australian native freshwater fish. It is a speciated, more specialised upland variant of the river blackfish, Gadopsis marmoratus.
It is found in the cool, clear, strong-flowing, cobble bottomed, sub-alpine rivers and streams (ranging from small to large) in the southeast corner of the Murray-Darling river system. Their range encompasses northeast Victoria, southeast New South Wales and the Australian Capital Territory. Originally two-spined blackfish co-inhabited many of these waters with Macquarie perch and trout cod.
Two-spined blackfish are similar in shape and appearance to river blackfish, though their spiny dorsal fin usually contain only two spines (hence their scientific name) in comparison to river blackfish which have 7 to 13 distinguishable spines in their spiny dorsal fin. (In reality, this is a rather academic point as two-spined blackfish have blurred the difference between the dorsal spines and the dorsal rays that make up their soft dorsal fin, and any distinctions between the two weakly calcified dorsal spines and the dorsal rays that follow it are hard to pick in a living specimen).
It is much the same as the river blackfish in spawning and diet, however rocks and the interstices (spaces) between them replace timber as the main spawning and habitat sites for two-spined blackfish, and two-spined blackfish are much smaller, commonly 15 to 17 cm and a maximum size of 25 cm.
The species suffers serious predation and competition from introduced species of trout but due its nocturnal habits and cryptic, cover-oriented behaviour it appears to survive in sufficient numbers to maintain populations.
References
- "Gadopsis bispinosus". Integrated Taxonomic Information System. 19 March.
{{cite web}}: Check date values in:|date=and|year=/|date=mismatch (help) - Froese, Rainer; Pauly, Daniel (eds.). "Gadopsis bispinosus". FishBase. October 2005 version.