Kopiejewska, W. (1989) A reserve of the oocytes of protoplasmatic growth in the ovaries of bream (Abramis brama L.) females in lake Sniardwy. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 117-129
| Species | Development state | Trait | Primary Data | Secondary Data |
| Abramis brama | Female | Age at sexual maturity | Bream females in Lake Sniardwy attain sexual maturity at the age of six, seven years […] It may be concluded that 6 and 7-years old females spawned for the first or second time in their life | 6.0 year |
| Abramis brama | Female | Onset of oogenesis | Vitellogenesis in the bream ovaries commenced in August in both lakes | ['August'] |
| Abramis brama | Spawning conditions | Spawning season | Bream females in Lake Sniardwy commence spawning in May-June | ['May', 'June'] |