Noges, P. and Järvet, A. (2005) Climate driven changes in the spawning of roach (Rutilus rutilus (L.)) and bream (Abramis brama (L.)) in the Estonian part of the Narva River basin. Boreal Environment Research, pp. 45-55
| Species | Development state | Trait | Primary Data | Secondary Data |
| Abramis brama | Female | Age at sexual maturity | Female breams reach sexual maturity in Vortsjärv at (6)7-10(11) years old | 8.5 year |
| Abramis brama | Female | Length at sexual maturity | Female breams reach sexual maturity in Vortsjärv at 26-36 cm | 31.0 cm |
| Abramis brama | Male | Age at sexual maturity | Male breams reach sexual maturity in Vortsjärv at the age of (6)7-9(10) years | 8.0 years |
| Abramis brama | Male | Length at sexual maturity | Male breams reach sexual maturity in Vortsjärv 25-32 cm long | 28.5 cm |
| Abramis brama | Spawning conditions | Spawning season | Bream started to spawn 16-17 days later than roach, the median dates being 16 May for rivers and 22 May for lakes. One half of all measurements fell into a range of 16 days between 13 and 28 May. | ['May'] |
| Abramis brama | Spawning conditions | Spawning period duration | Median values (upper and lower quartiles in parenthesis) => 3 (2-6) in lakes and 2 (1-3) in rivers | 4.0 weeks |
| Abramis brama | Spawning conditions | Spawning temperature | For bream, the typical range is 12-20°C, while extremes may reach 8 and 24°C […] The median water temperature measured in large lakes at the beginning of spawning in bream in rivers respective of lakes (correspondinglyn 12.9 and 13.3°C) was not significantly different [...] Spawning starts at water temperature of 13-14°C and reaches its peak at 16-19°C | 16.0 °C |
| Abramis brama | Spawning conditions | Spawning release | Bream is a single spawner in the sense the in one individual all eggs mature synchronously […] In lake Peipsi, breams lay their eggs usully in 2-3 groups during the spawning period | Total |
| Rutilus rutilus | Female | Age at sexual maturity | Female first time spawners are older, 3(4)-5(6) years | 1.0 year |
| Rutilus rutilus | Female | Length at sexual maturity | Bigger than males 10-13 cm | 11.5 cm |
| Rutilus rutilus | Female | Onset of oogenesis | Eggs for next spring start to develop already in July | ['April', 'May', 'June', 'July'] |
| Rutilus rutilus | Male | Age at sexual maturity | Males roaches reach their sexual maturity at 2(3)-4(5) years age | 2.0 years |
| Rutilus rutilus | Male | Length at sexual maturity | When they are 8-11 cm long | 9.5 cm |
| Rutilus rutilus | Male | Onset of spermatogenesis | Gonads of the male in August | ['August'] |
| Rutilus rutilus | Spawning conditions | Spawning migration period | The upstream migration of roach started in a small river in Norway at water temperatures of 6-10°C, and in the Malse River (Czech Republic) at 13-14°C | No data |
| Rutilus rutilus | Spawning conditions | Spawning season | Roach stared to spawn on average aound 30 April (day no. 120) in rivers and around 5 May in lakes within the Narva River Basin. One half of all measurement fell into a range of 16 days between 26 April and 11 May […] In lake Peipsi roach starts to spawn at the end of April. Spawning ends during the second half of May | ['April', 'May'] |
| Rutilus rutilus | Spawning conditions | Spawning period duration | Median values (upper and lower quartiles in parenthesis) => 5 (3-9) in lakes and 3 (2-5) in rivers […] Our analysis revealed a rather short period spawning duration (median 5 days) at a particular spawning ground, but obviously bue to the large spatial variability of conditions in the whole basin, the spawning period is extended to several weeks | 6.0 weeks |
| Rutilus rutilus | Spawning conditions | Spawning temperature | Roach spawns most typically at temperatures between 8 and 19.4°C with extremes reaching to 5 and 22°C […] Spawned spontaneously in the laboratory when the temperature reached 18-20°C […] Spawning started in lakes when the median water temperature measured at four stations in large lakes reached 8.7°C. During roach spawning in rivers, the lake temperature was almost one degree lower [...] In lake Peipse roach starts to spawn at water temperature of 8-10°C, and mass spawning takes place at 10-13°C | 19.0 °C |
| Rutilus rutilus | Spawning conditions | Mating system | Spawning in several groups was observed in rare cases | Promiscuity |