Hulata, G. and Moav, R. and Wohlfarth, G. (1974) The relationship of gonad and egg size to weight and age in the European and Chinese races of the common carp Cyrpinus caprio L. J. Fish. Biol., pp. 745-758
| Species | Development state | Trait | Primary Data | Secondary Data |
| Cyprinus carpio | Egg | Oocyte diameter | Egg diameter in 11 month old and 23 month old carp, vary according to different king of carp from 0.79 +/- 0.025, 0.94 +/- 0.02; 1.29 +/-0.035 | 0.79 mm |
| Cyprinus carpio | Egg | Egg size after water-hardening | Size of eggs taken from spawning beds ranged from means of 1.23 +/-0.03 to 1.76 +/-1.76 | 1.23 mm |
| Cyprinus carpio | Female | Onset of oogenesis | GSI increase from 1.7 +/- 0.4 in September 28 to 6.2 +/- 1.1 in November 12 for big-belly and 0.4 +/-0.1 to 1.1 +/- 0.2 for Gold in Israel | ['September', 'November'] |
| Cyprinus carpio | Male | Maximum GSI value | GSI reaches 16.3 +/- 2.0 for big-belly and 7.0 +/- 0.7% for Gold in November 12 in Israel | 16.3 percent |
| Cyprinus carpio | Spawning conditions | Spawning season | The studies were conducted in experimental ponds at the Fish and Aquaculture Research station, Dor. All the fish spawned within a single week in April. | ['April'] |