Fernandez-Delgado, C. and Hernando, J.A. and Herrera, M. and Bellido, M. (1988) Age, growth and reproduction of Aphanius iberus (Cuv. & Val., 1846) in the lower reaches of the Guadalquivir River (south-west Spain). Freshw. Biol., pp. 227-234
| Species | Development state | Trait | Primary Data | Secondary Data |
| Aphanius iberus | Egg | Oocyte diameter | Mean egg diameter of 0.7285 for age 1 and 0.8145 for age 0 | 0.73 mm |
| Aphanius iberus | Female | Age at sexual maturity | From April to July, 1+ group specimens (7-12 months old) reproduced. Their offspring (0+ group; 3-4 months) reproduced) from July to September. | 9.5 year |
| Aphanius iberus | Female | Length at sexual maturity | From 2.3 to 2.8 [Females] | 2.3 cm |
| Aphanius iberus | Female | Female sexual dimorphism | Males mature before famles, but females were larger than males | Absent |
| Aphanius iberus | Female | Relative fecundity | 1609.76 [For age 1] and 759.07 [for Age 0] | 1609.76 thousand eggs/kg |
| Aphanius iberus | Female | Onset of oogenesis | January-February | ['January', 'February'] |
| Aphanius iberus | Female | Intensifying oogenesis activity | March-April | ['March', 'April'] |
| Aphanius iberus | Female | Maximum GSI value | Two maxima: one in April [mean of 13, up to 14.5] and a second in August-September [mean of 3, up to 4]. Each maximum represented females of different ages | 13.0 percent |
| Aphanius iberus | Male | Age at sexual maturity | From April to July, 1+ group specimens (7-12 months old) reproduced. Their offspring (0+ group; 3-4 months) reproduced) from July to September. | 9.5 years |
| Aphanius iberus | Male | Length at sexual maturity | Between 1.7 to 2.4 [Male] | 1.7 cm |
| Aphanius iberus | Male | Onset of spermatogenesis | Gonad development started in February and continued till April | ['February', 'April'] |
| Aphanius iberus | Male | Main spermatogenesis activity | March-April | ['March', 'April'] |
| Aphanius iberus | Male | Maximum GSI value | Mean of 0.5 [In April] | 0.5 percent |
| Aphanius iberus | Male | Spermatogenesis duration | From September until January | 5.0 months |
| Aphanius iberus | Spawning conditions | Spawning season | May to September | ['May', 'June', 'July', 'August', 'September'] |
| Aphanius iberus | Spawning conditions | Spawning release | Multiple spawner | Multiple |
| Aphanius iberus | Spawning conditions | Parity | This stock contains only three age groups (0+, 1+, and 2 +) of which 0+ group constitutes more than 95% [Very few of the 1+ group specimens survived to spawn the following year] | No category |