| Main Ref. | Trewavas, E., 1983 |
| Appearance refers to | Male; Female |
| Bones in OsteoBase |
| Specialized organs | no special organs |
| Different appearance | different morphology during breeding season only |
| Different colors | different colors during breeding season only |
| Remarks |
| Striking features | none |
| Body shape lateral | fusiform / normal |
| Cross section | compressed |
| Dorsal head profile | clearly concave |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Type of scales | cycloid scales |
| Diagnosis |
Adults yellowish silvery, greenish on back. Breeding males darker and iridescent, with black lower parts of head, throat and belly and dusky lower fins but with no yellow coloring. Ripe females also becoming more dusky, with the red of the caudal fin intensified. Genital papilla white in both sexes. |
| Ease of Identification |
| Lateral Lines | 2 Interrupted: No |
| Scales on lateral line | 31 - 33 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 4 - 4.5 |
| Scale rows below lateral line | |
| Scales around caudal peduncle | |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | absent |
| Gill rakers | |
| on lower limb | 16 - 19 |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total | 29 - 30 |
| Attributes | extending over most of the back length |
| Fins number | 1 |
| Finlets No. | Dorsal 0 |
| Ventral 0 | |
| Spines total | 16 - 19 |
| Soft-rays total | 10 - 13 |
| Adipose fin | absent |
| Attributes | more or less truncate; more or less normal |
| Fins number | 1 |
| Spines total | 4 - 4 |
| Soft-rays total | 9 - 11 |
| Pectoral | Attributes more or less normal |
| Spines | |
| Soft-rays | |
| Pelvics | Attributes more or less normal |
| Position thoracic | |
| Spines | |
| Soft-rays |