Neja, Z. and Kompowski, A. (2001) *Some data on the biology of common bream, Abramis brama (L., 1758), from the miedzyodrze waters.* **Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.]**, pp. 3-26

Species | Development state | Trait | Primary Data | Secondary Data |

Abramis brama | Female | Maximum GSI value | In spring, the ovaries accouned for 0.2-24.7% of the total body weight | 12.45 percent |

Abramis brama | Male | Maximum GSI value | In spring, the testes accounted for up to 3.7% | 3.7 percent |

Abramis brama | Female | Age at sexual maturity | Other studies: 50% of the males matured having attained TL = 35.5 cm (SL= 27.7 cm) at the age of 7 years. […] Bream inhabiting the Rybinsk reservoir on the Volga to be sexually mature when older than 7 years, when 9.3% of the individuals were mature, at the average length of 27.4 cm. At the age of 9 years, almost half (48.1%) of all the individuals were mature, at the average length of 32.0 cm. All the bream (100%) were mature as last as in their 13th year of life, having attained a mean length of 38.4 cm | 9.0 years |

Abramis brama | Female | Length at sexual maturity | All the individuals measuring up to 12 cm were immature (Maier gonad maturity scale stage I). The smallest length of mature bream (Maier scale stage II) was 13 cm. At the length of 20 cm, 50% of the population were mature. Thus that length should be regarded as the length at first maturity. All the individuals measuring 30 cm and more were mature. [...] Other studies, on average 26.0-33.5 cm in females | 29.75 cm |

Abramis brama | Male | Length at sexual maturity | All the individuals measuring up to 12 cm were immature (Maier gonad maturity scale stage I). The smallest length of mature bream (Maier scale stage II) was 13 cm. At the length of 20 cm, 50% of the population were mature. Thus that length should be regarded as the length at first maturity. All the individuals measuring 30 cm and more were mature. | 12.0 cm |

Abramis brama | Female | Age at sexual maturity | Other studies: 50% of the females matured having attained TL = 39 cm (SL= 30.5 cm) at the age of 8 years. […] Bream inhabiting the Rybinsk reservoir on the Volga to be sexually mature when older than 7 years, when 9.3% of the individuals were mature, at the average length of 27.4 cm. At the age of 9 years, almost half (48.1%) of all the individuals were mature, at the average length of 32.0 cm. All the bream (100%) were mature as last as in their 13th year of life, having attained a mean length of 38.4 cm | 8.0 year |