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<p>The bullfrog (<i>Rana catesbeianus</i>) is an important economic aquaculture animal, providing a high-quality nutritional resource for humans. However, the effects of high stocking density in large-scale artificial rearing on the growth, physiological adaptation, nutritional value and health status of bullfrogs within a flooded ecological system remain unclear. Here, bullfrogs with an average weight of 48.47 ± 1.31&#xa0;g were randomly distributed into five stocking density groups (100 (control), 125, 150, 175 and 200 frogs/m<sup>2</sup>). After reared for 60&#xa0;days in flooded ecological systems, the growth performance of these bullfrogs decreased significantly as the stocking density increased. However, the nutrition composition of whole body and muscle showed no significant differences between the control and high-density groups. Serum superoxide dismutase (SOD) and catalase (CAT) activities reduced significantly with the increase in stocking density, while aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities and malondialdehyde (MDA) concentration increased remarkably. Furthermore, when compared with the control group, the structure of intestinal villi and intestine, along with the activities of intestinal digestive enzymes, all decreased significantly in high stocking densities. These results indicated that high stocking density had adverse effects on the growth, antioxidant capacity and intestinal health levels of bullfrogs, but no changes were observed in the general nutrient value. The findings from this study will contribute to the large-scale artificial rearing of bullfrogs in flooded ecological systems.</p>

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Effects of stocking density on the growth, nutrition, antioxidant capacity and intestinal health of bullfrog (Rana catesbeianus)

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Feng Chen,
  • Kangquan Yu,
  • Heng Zhang,
  • Mengting Pei,
  • Junde Fan,
  • Daiqin Yang,
  • Tilin Yi

摘要

The bullfrog (Rana catesbeianus) is an important economic aquaculture animal, providing a high-quality nutritional resource for humans. However, the effects of high stocking density in large-scale artificial rearing on the growth, physiological adaptation, nutritional value and health status of bullfrogs within a flooded ecological system remain unclear. Here, bullfrogs with an average weight of 48.47 ± 1.31 g were randomly distributed into five stocking density groups (100 (control), 125, 150, 175 and 200 frogs/m2). After reared for 60 days in flooded ecological systems, the growth performance of these bullfrogs decreased significantly as the stocking density increased. However, the nutrition composition of whole body and muscle showed no significant differences between the control and high-density groups. Serum superoxide dismutase (SOD) and catalase (CAT) activities reduced significantly with the increase in stocking density, while aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities and malondialdehyde (MDA) concentration increased remarkably. Furthermore, when compared with the control group, the structure of intestinal villi and intestine, along with the activities of intestinal digestive enzymes, all decreased significantly in high stocking densities. These results indicated that high stocking density had adverse effects on the growth, antioxidant capacity and intestinal health levels of bullfrogs, but no changes were observed in the general nutrient value. The findings from this study will contribute to the large-scale artificial rearing of bullfrogs in flooded ecological systems.