Diagnosis and description of the genus Helicophagus

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bekateen
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Diagnosis and description of the genus Helicophagus

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Gustiano, R., Ath-thar, M. H. F., Prakoso, V. A., Radona, D., & Kusmini, I. I. (2019). Diagnostic and description of asian pangasiid catfish genus Helicophagus from southeast asia. Indonesian Fisheries Research Journal, 25(2), 123-131. http://dx.doi.org/10.15578/ifrj.25.2.2019.123-131

http://ejournal-balitbang.kkp.go.id/ind ... /view/7728
PDF: http://ejournal-balitbang.kkp.go.id/ind ... /7728/6493

Species mentioned:
ABSTRACT
Pangasiid catfishes is an economic important catfish family for fishery. Nowadays, three species, Pangasius hypophtahlmus [sic], P. boucorti [sic], and P. djambal, are used in aquaculture. Among the genera in Pangasiidae, Helicophagus was less studied. Although this genus was less preferred than other popular species in Pangasiidae, it still has high commercial price. The present study was conducted to clarify the differences of the exist species in the genus Helicophagus based on biometric analyses. Twenty six specimens, collected from represent rivers in Southeast Asia, used for the material examined. Several type specimens deposited in museums were also added in the analyses. Thirty five characters were designed for measurement on the unique body conformation. Principal component analysis (PCA) was applied to distinguish different species and found strong characters for key identification and description. The results presented the data and information on the diagnosis, description, distribution, and ecology of each species. Key identification of each species are given. The three species (Helicophagus typus, H. waandersii, and H. leptorhynchus) enabled to show their differences based on eye diameter and vomerine toothplate length.
Keywords: Catfish; Pangasiidae; Helicophagus; biometric analysis
Attachments
Figure 1. Measurements taken on Pangasius specimens: 1. Standard length; 2. Head length; 3. Snout<br />length; 3a. Anterior snout width; 3b. Posterior snout width; 4. Head depth; 5. Head width; 6.<br />Predorsal length; 7. Caudal peduncle length; 8. Caudal peduncle depth; 9. Pectoral fin length; 10.<br />Pectoral spine length; 11. Dorsal fin length; 12. Dorsal spine width; 13. Pelvic fin length; 14. Anal<br />fin height; 15. Anal fin length; 16. Adipose fin height; 17. Adipose fin width; 18. Eye diameter; 19.<br />Mouth width; 20. Lower jaw length; 21. Interorbital length; 22. Distance snout to isthmush; 23.<br />Postocular length; 24. Maxillary barbel length; 25. Mandibulary barbel length; 26. Body width; 27.<br />Prepectoral length; 28. Prepelvic length; 29. Vomerine width; 30. Vomerine width; 31. Palatine<br />length; 32. Palatine width; 33. Dorsal spine width.
Figure 1. Measurements taken on Pangasius specimens: 1. Standard length; 2. Head length; 3. Snout
length; 3a. Anterior snout width; 3b. Posterior snout width; 4. Head depth; 5. Head width; 6.
Predorsal length; 7. Caudal peduncle length; 8. Caudal peduncle depth; 9. Pectoral fin length; 10.
Pectoral spine length; 11. Dorsal fin length; 12. Dorsal spine width; 13. Pelvic fin length; 14. Anal
fin height; 15. Anal fin length; 16. Adipose fin height; 17. Adipose fin width; 18. Eye diameter; 19.
Mouth width; 20. Lower jaw length; 21. Interorbital length; 22. Distance snout to isthmush; 23.
Postocular length; 24. Maxillary barbel length; 25. Mandibulary barbel length; 26. Body width; 27.
Prepectoral length; 28. Prepelvic length; 29. Vomerine width; 30. Vomerine width; 31. Palatine
length; 32. Palatine width; 33. Dorsal spine width.
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Re: Diagnosis and description of the genus Helicophagus

Post by bekateen »

Key to the species of Helicophagus: (HL = Head length)
  • 1a. Anal rays 27-30; premaxillary teeth in a single curved band; gill rakers on the first branchial arch 27-33; eye diameter less than 9.3-13.5% HL; mandibular barbel less than 35%; anal fin length less than 32.9%..... Helicophagus typus
  • 1b. Anal ray counts more than 35; premaxillary teeth divided into two quadratic bands; gill rakers on the first branchial arch 7-18; eye diameter more than 14% HL; mandibular barbel more than 35%; anal fin length more than 33.6%..... 2
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bekateen
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Re: Diagnosis and description of the genus Helicophagus

Post by bekateen »

  • 2a. Vomerine toothplate length 1.2-4.2% HL; vomerine toothplate length is about one third of premaxillary tooth plate length..... Helicophagus waandersii
  • 2b. Vomerine toothplate length 5.1-8.9% HL; vomerine toothplate length is about one half premaxillary toothplate..... Helicophagus leptorhynchus
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