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<p><i>Pag</i><i>rus</i> <i>major</i> is a marine fish of significant economic importance in aquaculture, where improving growth traits through selective breeding is a primary goal. To provide a scientific basis for such breeding programs, this study investigated the morphological growth patterns of red sea bream under cage culture at different developmental stages and identified key morphological indicators influencing body weight. The study measured body weight and 16 phenotypic traits in 500 red sea bream individuals at five age points (3, 6, 9, 12, and 15&#xa0;months). Correlation analysis, path analysis, and stepwise multiple regression methods were used to elucidate the direct and indirect effects of various morphological traits on body weight. The results revealed that key morphological traits influencing body weight, such as body length and body depth, varied significantly with age. During the early growth stage (3, 6&#xa0;months) and at 12&#xa0;months of age, body length was the primary influencing factor (path coefficients of 0.522, 0.407, and 0.452, respectively). However, at 9 and 15&#xa0;months, body depth became the dominant factor. Notably, at 15&#xa0;months of age, tail fin length exhibited a significant negative direct effect on body weight. The multiple regression models established for all ages were highly significant (<i>P</i> &lt; 0.01), with coefficients of determination all exceeding 0.850. The results indicate that red sea bream exhibits an allometric growth strategy, characterized by a transition from early body length growth to later body depth growth. To maximize breeding efficiency, we recommend a staged indirect selection strategy: using body length as the primary selection criterion for individuals under 1&#xa0;year of age and body depth as the core criterion in later stages. This study provides a theoretical foundation for scientifically staged breeding of red sea bream.</p>

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Morphological traits and body weight dynamics in cage-cultured red sea bream (Pagrus major) across different ages

  • 期刊论文

  • 发表日期：

    2025年11月13日

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  • Qisheng Zheng,
  • Zhen Zhao,
  • Xinghong Luo,
  • Qishuai Wang,
  • Yuanlei Zhang,
  • Shanshan Wang,
  • Shuyuan Zhang,
  • Mingquan Peng,
  • Lichen Qi,
  • Ying Pan

摘要

Pagrus major is a marine fish of significant economic importance in aquaculture, where improving growth traits through selective breeding is a primary goal. To provide a scientific basis for such breeding programs, this study investigated the morphological growth patterns of red sea bream under cage culture at different developmental stages and identified key morphological indicators influencing body weight. The study measured body weight and 16 phenotypic traits in 500 red sea bream individuals at five age points (3, 6, 9, 12, and 15 months). Correlation analysis, path analysis, and stepwise multiple regression methods were used to elucidate the direct and indirect effects of various morphological traits on body weight. The results revealed that key morphological traits influencing body weight, such as body length and body depth, varied significantly with age. During the early growth stage (3, 6 months) and at 12 months of age, body length was the primary influencing factor (path coefficients of 0.522, 0.407, and 0.452, respectively). However, at 9 and 15 months, body depth became the dominant factor. Notably, at 15 months of age, tail fin length exhibited a significant negative direct effect on body weight. The multiple regression models established for all ages were highly significant (P < 0.01), with coefficients of determination all exceeding 0.850. The results indicate that red sea bream exhibits an allometric growth strategy, characterized by a transition from early body length growth to later body depth growth. To maximize breeding efficiency, we recommend a staged indirect selection strategy: using body length as the primary selection criterion for individuals under 1 year of age and body depth as the core criterion in later stages. This study provides a theoretical foundation for scientifically staged breeding of red sea bream.