High Expression Levels of the Genes cyclin-A2 and glucocorticoid receptor Are Associated with High-Quality Embryos in Gilthead Sea Bream (Sparus aurata L.)

Identifying early egg-quality predictors is a major challenge in finfish hatcheries, and relevant research now focused on the development of molecular markers. In our study, we examined whether fertilization rates morphological abnormalities sea bream egg batches high (HQ) low quality (LQ) are associated with mRNA levels cathepsin D, Z, cyclin-A2, glucocorticoid receptor. Additionally, these descriptors were skeletal during larval period. HQ characterized by significantly higher normal embryos (95.8 ± 2.3%) lower unfertilized (2.8 1.0%) abnormal eggs (1.3 1.4%), compared to LQ (84.2 0.8% embryos, 12.3 eggs, 3.5 1.4% eggs) (p < 0.05, Mann–Whitney U test). Relative expression cyclin-A2 receptor was found be those (respectively, p 0.01 No statistically significant differences observed transcripts D Z > Differences rate between two groups larvae not G-test), indicating that may serve as reliable markers for prediction fish but later stages.