Kompowski, A. (1982) On some aspects of biology of bream, Abramis brama (L., 1758) inhabiting the river Regalica and lake Dabie. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 3-25
| Species | Development state | Trait | Primary Data | Secondary Data |
| Abramis brama | Female | Onset of oogenesis | From August onwards there is a constant increase in the coefficient | ['August'] |
| Abramis brama | Female | Intensifying oogenesis activity | The coefficient attains its maximal values in April and May, directly before spawning | ['April', 'May'] |
| Abramis brama | Female | Maximum GSI value | The lowest and highest mean coefficients in males were 2.141 (June 1976, Lake Dabie) and 24.532 (late May, 1976, Regalicia) | 2.14 percent |
| Abramis brama | Female | Resting period | The minimum values are found in June and July, which corresponds to a resting period of gonads after spawning | 3.0 months |
| Abramis brama | Male | Maximum GSI value | The lowest and highest mean coefficients in males were 0.867 (July 1976, Lake Dabie) and 4.411 (late May, 1976, Lake Dabie) | 0.87 percent |