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<p>The Pacific oyster <i>Crassostrea gigas</i> is a globally significant aquaculture species. Selective breeding over recent decades has improved the development of the oyster industry. Haida No. 1 is a fast-growing <i>C. gigas</i> strain developed through mass selection. This study employed a complete diallel cross between ‘Haida No. 1’ (C) and a wild population (W), generating two hybrids C ♀×W♂ [CW] and W♀×C♂ [WC] lines, as well as two purebreds C♀×C♂ [CC] and W♀×W♂ [WW] lines. The growth, survival, and heterosis of these groups were evaluated. The results showed superior fertilization rate, hatching rate, larval survival, and growth performance in CC compared with WW. In summer, CC exhibited significantly faster growth than WC and WW. However, CC displayed lower survival than WW throughout the grow-out stage and exhibited the highest mortality rate during the summer. In the grow-out stage, the shell height and wet weight of CW are similar to CC, while the survival rates of CW and WC exceeded that of CC. These findings indicate that successive mass selection can significantly enhance Pacific oyster growth but exhibits a negative effect on survival. The combination of C♀×W♂ yields hybrids with superior growth and survival traits.</p>

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Comparative Analyses of Growth and Survival of ‘Haida No. 1’ and Wild Crassostrea gigas Pacific Oysters and Their Hybrids

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Kunyin Jiang,
  • Fangjian Dou,
  • Chengxun Xu,
  • Haijun Liu,
  • Qi Li

摘要

The Pacific oyster Crassostrea gigas is a globally significant aquaculture species. Selective breeding over recent decades has improved the development of the oyster industry. Haida No. 1 is a fast-growing C. gigas strain developed through mass selection. This study employed a complete diallel cross between ‘Haida No. 1’ (C) and a wild population (W), generating two hybrids C ♀×W♂ [CW] and W♀×C♂ [WC] lines, as well as two purebreds C♀×C♂ [CC] and W♀×W♂ [WW] lines. The growth, survival, and heterosis of these groups were evaluated. The results showed superior fertilization rate, hatching rate, larval survival, and growth performance in CC compared with WW. In summer, CC exhibited significantly faster growth than WC and WW. However, CC displayed lower survival than WW throughout the grow-out stage and exhibited the highest mortality rate during the summer. In the grow-out stage, the shell height and wet weight of CW are similar to CC, while the survival rates of CW and WC exceeded that of CC. These findings indicate that successive mass selection can significantly enhance Pacific oyster growth but exhibits a negative effect on survival. The combination of C♀×W♂ yields hybrids with superior growth and survival traits.