No detailed citation.
| Species | Development state | Trait | Primary Data | Secondary Data |
| Alosa alosa | Spawning conditions | Mating system | In 2001 and 2002, the visual observation of the number of spawners participating in a spawning act showed that > 2 individuals were involved in 45% of the spawning acts | No category |
| Alosa alosa | Spawning conditions | Nycthemeral period of oviposition | During 2001 and 2002, the hourly distribution of spawning acts fluctuated during the spawning period but 50% of the spawning acts were observed in a short period of time (2:00 to 4:00 U.T +2). Otherwise, water temperature reduced the length of the nocturnal spawning activity by progressively shifting the reproduction peak towards the end of the night (between 4:00 to 5:00 U.T. +2) | Night |
| Alosa alosa | Spawning conditions | Spawning temperature | Over the study period, the temperatures observed during spawning period varied over the range 13.3-23°C. The minimum temperature below which reproduction activity seemed to be inhibited was between 13.9 and 14°C. | 18.15 °C |
| Alosa alosa | Spawning conditions | Spawning water type | Water flows observed during spawning period over the three years varied between 2.7 and 47.6 m3 s-1. In 2001 and 2002, current surface speeds ranged between 0.1 and 1.5 m s-1. | Flowing or turbulent water |
| Alosa alosa | Female | Age at sexual maturity | Sampled individuals in 2001 and 2002 were between 3 and 6 years for males | 4.5 years |
| Alosa alosa | Spawning conditions | Spawning migration period | During the three years upstream migration occurred between April 6 and August 15. The main movement took place between April 29 and June 18 in 2000 (96% of the migrants), between April 25 and June 16 in 2001 (94% of the migrants) and between April 19 and May 27 in 2002 (91% of the migrants). [...] Over the three years the temperature observed during the migration varied between 10.5°C and 23°C. The temperature threshold under which migration would be inhibited seemed to be close to 11°C and was recorded in 2001 only | ['April', 'August', 'May', 'June'] |
| Alosa alosa | Spawning conditions | Spawning season | Reproduction took place between April 24th and July 11th | ['April', 'July'] |
| Alosa alosa | Female | Weight at sexual maturity | In females, sizes range from 600-3100 g | 1850.0 kg |
| Alosa alosa | Female | Length at sexual maturity | In females, sizes range from 445-670 mm | 557.5 cm |
| Alosa alosa | Male | Length at sexual maturity | In males, sizes ranged from 370 to 585 mm | 370.0 cm |
| Alosa alosa | Male | Weight at sexual maturity | From 510 to 2000 g | 510.0 kg |
| Alosa alosa | Female | Age at sexual maturity | Sampled individuals in 2001 and 2002 were between 4 and 7 years for females | 5.5 year |
| Alosa alosa | Spawning conditions | Parity | The percentage of multispawners was very low (2.1-2.5%) | No category |