Kompowski, A. and Neja, Z. (2004) Fecundity of asp Aspius aspius (L., 1758) from Miedzyodrze (Poland) waters. Bulletin of the Sea Fisheries Institute, Gdynia [Bull. Sea Fish. Inst. Gdynia]. ., pp. 23-30
| Species | Development state | Trait | Primary Data | Secondary Data |
| Aspius aspius | Female | Age at sexual maturity | 4-5 [Female] | 4.5 year |
| Aspius aspius | Female | Length at sexual maturity | 37.32-45.47 [Female] | 41.39 cm |
| Aspius aspius | Female | Relative fecundity | Mean 70.53 ± 13.20, range 35.11 to 107.94 | 70.53 thousand eggs/kg |
| Aspius aspius | Female | Absolute fecundity | Mean of 158.526 ± 56.659 [Range 63,044 in females 43.3 cm in length and 324,833 in female 64.3 cm length] [Absolute fecundities in other populations: 16-269; 48.3-121.9; 52.2-212.8; 67.6-189.0; 73.5-366.5; 63-324.8] | 158.53 thousand eggs |
| Aspius aspius | Female | Onset of oogenesis | During the fall from September to November, the average GSI value rose sharply to a level close to that seen in the pre-spawning period | ['September', 'October', 'November', 'December'] |
| Aspius aspius | Female | Maximum GSI value | The highest average values of this index among females 12.07 occurred at the end of March. This is also when the maximum individual value of this index was observed 20.73 (range 0.22-20.73) | 10.47 percent |
| Aspius aspius | Female | Resting period | 1.61 [Between May to August] | 1.61 months |
| Aspius aspius | Female | Resting period | In April, the average female GSI fell to 1.77, which indicates that the majority of the studied fish had already spawned. In May the female GSI value was even lower at 1.04. During the fall from September to November, the average GSI value rose sharply to a level close to that seen in the pre-spawning period. | 1.77 months |
| Aspius aspius | Male | Age at sexual maturity | 4-5 [Male], only only one at 3 | 4.5 years |
| Aspius aspius | Male | Length at sexual maturity | 39.20-45.09 [Male] | 42.15 cm |
| Aspius aspius | Male | Onset of spermatogenesis | September-October | ['September', 'October'] |
| Aspius aspius | Male | Main spermatogenesis activity | December to March | ['January', 'February', 'March', 'December'] |
| Aspius aspius | Male | Maximum GSI value | 2.02 [April] | 2.02 percent |
| Aspius aspius | Male | Spermatogenesis duration | From September to April | 8.0 months |
| Aspius aspius | Male | Resting period | 0.14 [August] | 2.0 months |
| Aspius aspius | Spawning conditions | Spawning season | First half of April in Polish part and as earlt as March in German part | ['March', 'April'] |