Kagawa, H. and Young, G. and Y., Nagahama. (1983) Changes in plasma steroid hormone levels during gonadal maturation in goldfish, Carassius auratus. Bull. Japan. Soc. Sci. fish., pp. 1783-1787
| Species | Development state | Trait | Primary Data | Secondary Data |
| Carassius auratus | Female | Oocyte development | Asynchronous | Asynchronous |
| Carassius auratus | Female | Onset of oogenesis | December [GSI increased slowly from December to February, from 3.9 ±0.7 to 5.2 ± 1.0) | ['January', 'February', 'December'] |
| Carassius auratus | Female | Intensifying oogenesis activity | March until April [GSI rapidly increased in March, and after the first ovulation second important increase in April] | ['March', 'April'] |
| Carassius auratus | Female | Maximum GSI value | 18.7 ± 0.8 (April 30) | 18.7 percent |