Morphology Data of Hemibrycon jelskii
Identification keys
Main Ref. Bertaco, V.A. and L.R. Malabarba, 2010
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Males with bony hooks in dorsal-, anal-, pelvic- and pectoral-fin rays; slightly differ in pectoral- and pelvic-fin lengths and body depth when compared with females; anal-fin slightly concave (vs. nearly straight in females); mature males with gill gland on first gill arch, covering the first branchial filaments (Ref. 85819).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

This species is distinguished from its congeners, except H. helleri, by the size of humeral spot (over 7-9 vs. 3-6 horizontal series of scales); differs from H. helleri by the number of branched anal-fin rays (25-30 vs. 19-23), and by the number of scales along anal-fin base scale sheath (13-28 vs. 6-12); differs from H. divisorensis, by the absence of a wide black asymmetrical spot covering base of caudal-fin rays and black band in the lower half of the caudal peduncle (vs. presence), and by the number of scale rows above and below lateral line (7-9 and 5-7 vs. 6-7 and 4-5, respectively) (Ref. 85819).

Ease of Identification

Meristic characteristics of Hemibrycon jelskii

Lateral Lines Interrupted: No
Scales on lateral line 40 - 43
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 5 - 7
Scale rows below lateral line
Scales around caudal peduncle 16 - 16
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 12 - 14
on upper limb 7 - 9
preanal 16 - 18
total 38 - 40


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 8 - 8
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 25 - 30

Paired fins

Pectoral Attributes  
Soft-rays   10 - 13
Pelvics Attributes  
Soft-rays   6 - 7
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
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