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| Species | Development state | Trait | Primary Data | Secondary Data |
| Alosa fallax | Spawning conditions | Nycthemeral period of oviposition | Spawning usually takes place at dusk | Dusk |
| Alosa fallax | Spawning conditions | Spawning substrate | Mainly gravel | Lithophils |
| Alosa fallax | Spawning conditions | Spawning site preparation | No, eggs are released directly into the water column | Open water/substratum scatter |
| Alosa fallax | Spawning conditions | Spawning water type | Upper tidal limit of the River | No category |
| Alosa fallax | Spawning conditions | Spawning depth | Less than 1.5 m | 1.5 m |
| Alosa fallax | Female | Maximum GSI value | 18.8 ± 7.5% | 18.8 percent |
| Alosa fallax | Egg | Incubation time | 4-8 | 6.0 days |
| Alosa fallax | Male | Maximum GSI value | 11.4 ± 2.9 | 11.4 percent |
| Alosa fallax | Female | Age at sexual maturity | Mean age of 2.95 for males | 2.95 years |
| Alosa fallax | Egg | Egg Buoyancy | Sink to the bottom | Semi-Pelagic |
| Alosa fallax | Spawning conditions | Spawning migration period | In Ireland, mature fish enter from April to June, with peak spawning activity occuring in late May | ['April', 'May', 'June'] |
| Alosa fallax | Larvae | Initial larval size | About 10 | 10.0 mm |
| Alosa fallax | Female | Age at sexual maturity | Mean age of 5.6 for female | 5.6 year |