Unver, B. (1998) An investigation of the reproduction properties of chub (Leuciscus cephalus L., 1758) in Lake Tödürge (Zara/Sivas). Tr. J. of Zoology, pp. 141-147
| Species | Development state | Trait | Primary Data | Secondary Data |
| Leuciscus cephalus | Egg | Oocyte diameter | The highest mean egg diameter was found in May (1.04 mm) and the lowest values was found in July (0.46 mm). Eggs diameters were determine din other studies at 0.78-1.20 mm, 0.55-1.38 mm, 1.03 mm, and 0.83-1.50 mm | 0.99 mm |
| Leuciscus cephalus | Female | Age at sexual maturity | Females matured in their third or fourth year of life. Other studies indicated that the sexual maturity age in the chub population of the Black Sea basin is III. The maturity age of chub was found to be III in the females and II in the males, however it was determined to be IV in the females and III in the males | 3.0 year |
| Leuciscus cephalus | Female | Length at sexual maturity | The smallest mature female was 7.4 mm | 7.4 cm |
| Leuciscus cephalus | Female | Length at sexual maturity | Means of 95.6 [Age 2], 153.1 [Age 3], 175.9 [Age 4], 206.0 [Age 5], 226.2 [Age 6], and 258.5 [Age 7] for females | 95.6 cm |
| Leuciscus cephalus | Female | Weight at sexual maturity | Means of 11.44 g [Age 2], 47.05 [Age 3], 71.15 [Age 4], 114.60 [Age 5], 159.9 [Age 6], and 240.3 [Age 7] for females | 11.44 kg |
| Leuciscus cephalus | Female | Relative fecundity | Linear increase between fecundity and weight: n=1588.6+120.53 x W | 1588.6 thousand eggs/kg |
| Leuciscus cephalus | Female | Absolute fecundity | The mean fecundity was found to be 1158 in age group II and 28664 in age group VII. In other studies, described as: 1909-15680, 1960, 61808, 13269-59200, 2050-20140 eggs | 8794.5 thousand eggs |
| Leuciscus cephalus | Female | Onset of oogenesis | After August, the gonads began to develop and the values of GSI again started to increase gradually until November | ['August', 'November'] |
| Leuciscus cephalus | Female | Maximum GSI value | The maximum values for females in May was calculated to be 9.1 | 9.1 percent |
| Leuciscus cephalus | Male | Age at sexual maturity | Males reached maturity in their second or third year of life | 2.0 years |
| Leuciscus cephalus | Male | Length at sexual maturity | The smallest mature male was 67 mm | 67.0 cm |
| Leuciscus cephalus | Male | Onset of spermatogenesis | After August, the gonads began to develop and the values of GSI again started to increase gradually until November | ['August', 'November'] |
| Leuciscus cephalus | Male | Maximum GSI value | The maximum values for males in May was calculated to be 5.2 | 5.2 percent |
| Leuciscus cephalus | Spawning conditions | Spawning season | Between May and July | ['May', 'July'] |
| Leuciscus cephalus | Spawning conditions | Spawning period duration | At the end of the observation of gonads, it was determined that the fish has laid from May to the end of June. In other studies, described as between April and May, and if the altitude is more than 1000 meters, spawning occurs in June | 1000.0 weeks |
| Leuciscus cephalus | Spawning conditions | Parity | Maximum ages observed were VI in males and VII in females | No category |