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| Species | Development state | Trait | Primary Data | Secondary Data |
| Dicentrarchus labrax | Female | Age at sexual maturity | Bass in British waters mature for the first time at 4-7 years (about 35 cm total length), with males generally maturing before females | 5.5 years |
| Dicentrarchus labrax | Egg | Oocyte diameter | On completion of maturation (ripe egg stage), prior to ovulation, the oocyte (now an egg) mesures about 1.2 mm | 1.2 mm |
| Dicentrarchus labrax | Female | Age at sexual maturity | Bass in British waters mature for the first time at 4-7 years (about 35 cm total length), with males generally maturing before females | 5.5 year |