Lopez, M.A. and Gasquez, N. and Olmo-Vidal, J.M. and Aprahamian, C.D. and Gisbert, E. (2007) The presence of anadromous twaite shad (Alosa fallax) in the Elbo River (western Mediterranean, Spain): an indicator of the population's recovery?. Journal of Applied Ichthyology [J. Appl. Ichthyol./Z. Angew. Ichthyol.], pp. 1-4
| Species | Development state | Trait | Primary Data | Secondary Data |
| Alosa fallax | Egg | Oocyte diameter | Oocyte diameter 1.325 ± 0.032 | 1.32 mm |
| Alosa fallax | Female | Length at sexual maturity | Sizes range from 47.6 to 52.9 cm [Female specified] | 52.9 cm |
| Alosa fallax | Female | Weight at sexual maturity | 970 to 1519 g [Female specified] | 970.0 kg |
| Alosa fallax | Female | Female sexual dimorphism | Females were larger and heavier than males | Absent |
| Alosa fallax | Female | Relative fecundity | Mean of 46.83 ± 5.25 (n=9) | 46.83 thousand eggs/kg |
| Alosa fallax | Female | Absolute fecundity | Mean of 54294 ± 6174 (n=9) | 54294.0 thousand eggs |
| Alosa fallax | Female | Oocyte development | Histological data showed that the ovary of twaite shad exhibited group-synchronous development | Group-synchronous |
| Alosa fallax | Female | Maximum GSI value | Mean of 8.30 ± 0.83 [Between May and July] | 8.3 percent |
| Alosa fallax | Male | Length at sexual maturity | Range from 36.5 to 46 [Male specified] | 36.5 cm |
| Alosa fallax | Male | Weight at sexual maturity | Range from 523 to 905 g [Male specified] | 523.0 kg |
| Alosa fallax | Spawning conditions | Spawning temperature | Water ranged from 21.7°C to 24.5°C | 21.7 °C |
| Alosa fallax | Spawning conditions | Spawning water type | Enter the lower and middle rivers to spawn. Ebro River characterized by laminar fast flow areas | No category |
| Alosa fallax | Spawning conditions | Spawning depth | 3-4 m water depth | 3.5 m |
| Alosa fallax | Spawning conditions | Spawning substrate | Gravel susbtrate | Lithophils |
| Alosa fallax | Spawning conditions | Nycthemeral period of oviposition | Spawning was observed to occur between 02:00 and 4:00 h | No category |
| Alosa fallax | Spawning conditions | Spawning release | Batch spawning reproductive behavior | Multiple |