Morphology Data of Chromidotilapia nana
Identification keys
Abnormalities
Main Ref. Stiassny, M.L.J., A. Lamboj, D. De Weirdt and G.G. Teugels, 2008
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Sexual dimorphism poorly developed with males usually only 5-10% larger than females (Ref. 81260).

Descriptive characteristics of juvenile and adult

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

Diagnosis: 15-17 rakers on first gill arch; 2 large rounded to slightly elongated spots on flanks usually visible, sometimes with 1-2 small dark spots between the large ones; lachrymal depth greater than 22% SL (Ref. 81260). Usually a single row of teeth in both jaws (Ref. 50577, 81260).

Description: relatively robust (body depth 32.8-38.1%, mean 35.2% SL), with smallest adult body size in genus (max. 58.9 mm SL versus 76.7-127.8 mm in congeners); snout long and pointed (lachrymal depth 22.3-25.6%, mean 24.2% HL); usually a single row of teeth in lower jaw of adults (versus 2-3 rows in congeners); caudal peduncle usually longer than deep, only occasionally deeper than long; 9-10 (median 9) tuberculate hypobranchial and ceratobranchial rakers, 6-8 (median 7) lanceolate epibranchial rakers; some dorsal and anal fin rays elongated (Ref. 81260). Caudal rounded in both sexes (Ref. 50577, 81260). 2 scales between 8th pored scale of upper lateral line and dorsal fin base (Ref. 81260).

Coloration: head and body light brown with rosy overlay; 2 rows of dark spots and blotches sometimes visible on flanks; lips, cheeks and opercle often with yellow iridescence; ventral parts of head iridescent silvery colour (Ref. 81260). Some scales on body and caudal peduncle also with silvery colouration (Ref. 52307, 81260). Male with red or orange dorsal fin margin, and a thin, iridescent rosy submarginal band; other parts of fin clear (anterior) to red (posterior); centre of caudal fin rosy or red, upper and lower parts yellow; anal rosy or red, with violet base and dark outer margin; males lack maculation of dorsal, anal and caudal fin membranes; outer edge of pelvic fins dark blue or violet, rest of fin rosy or violet; pelvic fins clear or slightly yellow; body scales darkly marginated; female with white or rosy iridescent coloration in dorsal fin, outermost posterior parts clear or yellow; anal and pelvic fins rosy or violet, with yellowish posterior and dark anterior edge; pectoral fins yellow (Ref. 81260).

Ease of Identification

Meristic characteristics of Chromidotilapia nana

Lateral Lines Interrupted: No
Scales on lateral line 23 - 29
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 16 - 16
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 9 - 10
on upper limb 6 - 8
total 15 - 17
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   0
Ventral  0
Spines total 14 - 15
Soft-rays total 10 - 11
Adipose fin absent

Caudal fin

Attributes more or less normal

Anal fin(s)

Fins number 1
Spines total 3 - 3
Soft-rays total 8 - 9

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   12 - 13
Pelvics Attributes  
Position    
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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