The hybrid offspring from black porgy () have been successfully farmed in an attempt to develop new marine aquaculture species with optimal target traits. To analyze the molecular mechanism of different growth traits between parent fish (As) and hybrids (PA), the full-length cDNA sequences of ) from each were cloned and identified. The expression profiles of genes in six different tissues of two-year-old and 30 d larvae of F1 generation hybrids and pure individuals were evaluated and compared using real-time quantitative PCR. The gene is 1241 bp, both including an open reading frame (ORF) of 450 bp and encoding a peptide of 149 amino acids with an estimated molecular mass of 16.84 kD and a predicted isoelectric point (pI) of 4.09. Sequence alignment, structure comparison, and bioinformatics analyses showed that family. Functional domain analysis indicated that the protein has four EF-h and calcium-binding domains, with sixteen Ca²⁺ binding sites. are non-secretory and non-transmembrane proteins, and likely have their functional location in the cytoplasm. Quantification of expressed mRNA showed comparatively high levels in the brain and gonadal tissues of two-year-old fish and in larval fish. in gill, muscle, and gonadal tissue, as well as in larvae, but not significantly different in the brain, liver, or kidney tissues ( transcripts in the hybrid larvae, and the highest enrichment of in growth and development. This study provides a basis for further research into gene function and differing genetic traits between the parent and hybrid offspring of genus crosses of Sparidae.