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<p>A 42-day feeding experiment was conducted to assess the performance of red seabream when fed with black soldier fly larvae meal (BSFm). Diets were isocalorically designed with fishmeal or BSFm in ratios of 100:0 (group 1), 50:50 (group 2), and 22:78 (group 3). Group 1 exhibited a significantly higher specific growth rate (2.92% ± 0.22%/day) than group 3 (2.54% ± 0.22%/day), while group 2 (2.77% ± 0.21%/day) showed no significant difference. Stable isotope analysis suggested a lower assimilation of BSFm protein in groups 2 and 3, as indicated by their (delta nitrogen-15) δ<sup>15</sup>N ratios. In vitro digestibility evaluation revealed a significant deficiency in three essential amino acids (EAAs) in group 3 compared with group 11. This suggests that a diet comprising up to 50% BSFm does not affect the growth rate of red seabream, but an EAA deficiency may retard growth in group 3. Fatty acid analysis showed that lauric acid, which dominates in BSFm, accumulated to less than 3.8% of all fatty acids in seabreams in groups 2 and 3, despite constituting over 10.5% of the diets. This indicates low assimilation of dietary lauric acid into seabreams. Therefore, while BSFm can support the growth of red seabream, further improvements are needed for higher formulation rates of BSFm.</p>

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Protein and fatty acid assimilation from larvae of black soldier fly Hermetia illucens in diets for red seabream Pagrus major

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Tadashi Andoh,
  • Kenji Ishihara,
  • Takeshi Hano,
  • Takuya Seko

摘要

A 42-day feeding experiment was conducted to assess the performance of red seabream when fed with black soldier fly larvae meal (BSFm). Diets were isocalorically designed with fishmeal or BSFm in ratios of 100:0 (group 1), 50:50 (group 2), and 22:78 (group 3). Group 1 exhibited a significantly higher specific growth rate (2.92% ± 0.22%/day) than group 3 (2.54% ± 0.22%/day), while group 2 (2.77% ± 0.21%/day) showed no significant difference. Stable isotope analysis suggested a lower assimilation of BSFm protein in groups 2 and 3, as indicated by their (delta nitrogen-15) δ15N ratios. In vitro digestibility evaluation revealed a significant deficiency in three essential amino acids (EAAs) in group 3 compared with group 11. This suggests that a diet comprising up to 50% BSFm does not affect the growth rate of red seabream, but an EAA deficiency may retard growth in group 3. Fatty acid analysis showed that lauric acid, which dominates in BSFm, accumulated to less than 3.8% of all fatty acids in seabreams in groups 2 and 3, despite constituting over 10.5% of the diets. This indicates low assimilation of dietary lauric acid into seabreams. Therefore, while BSFm can support the growth of red seabream, further improvements are needed for higher formulation rates of BSFm.