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<p>The exercise and feeding capacity of sea urchins are pivotal factors influencing growth performance. In this study, a comprehensive 80-d feeding experiment was conducted to evaluate the effects of dietary vitamin B<sub>2</sub> supplementation on the exercise and feeding performance of sea urchin <i>Mesocentrotus nudus</i>. Three experimental diets were formulated by supplementing graded levels of vitamin B<sub>2</sub> (0, 15, and 30 mg/kg). Fresh kelp (<i>Saccharina japonica</i>) was used as the control diet. Each diet was randomly distributed to sea urchins cultured in three tanks with an initial average body weight of (3.63±0.02) g. The findings revealed that sea urchins fed with 15 mg/kg vitamin B<sub>2</sub> showed markedly higher growth performance, feed intake, feeding speed, and Aristotle’s lantern (AL) reflex frequency. They also showed markedly shorter righting response time. The dietary level of 15 mg/kg vitamin B<sub>2</sub> was found to significantly increase the collagen deposition in multiple tissues, including the spine joint, peristomial membrane (PM), AL muscle, and digestive tract. Meanwhile, sea urchins fed with 15 mg/kg vitamin B<sub>2</sub> exhibited the most extensive and densely organized collagen fiber regions in the PM. Further study showed that 15 mg/kg vitamin B<sub>2</sub> supplementation significantly upregulated the expression levels of <i>COLP1α, TGFβR2, COLP2α, TGFβR1, COLP3α</i>, and <i>SNIP1</i> genes in the PM of sea urchins, while downregulated the expression level of <i>MMP14</i>. The results indicated that vitamin B<sub>2</sub> promoted the exercise and feeding capacity of <i>M. nudus</i> by facilitating collagen production, potentially through activation of the TGF-<i>β</i>/Smad pathway.</p>

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Vitamin B2 Affects Growth Performance of Sea Urchin Mesocentrotus nudus by Regulating Collagen-Related Exercise and Feeding Capacity

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Haijing Liu,
  • Yulong Zheng,
  • Jiahao Cao,
  • Sai Zhang,
  • Ruixue Li,
  • Jun Ding,
  • Yaqing Chang,
  • Rantao Zuo

摘要

The exercise and feeding capacity of sea urchins are pivotal factors influencing growth performance. In this study, a comprehensive 80-d feeding experiment was conducted to evaluate the effects of dietary vitamin B2 supplementation on the exercise and feeding performance of sea urchin Mesocentrotus nudus. Three experimental diets were formulated by supplementing graded levels of vitamin B2 (0, 15, and 30 mg/kg). Fresh kelp (Saccharina japonica) was used as the control diet. Each diet was randomly distributed to sea urchins cultured in three tanks with an initial average body weight of (3.63±0.02) g. The findings revealed that sea urchins fed with 15 mg/kg vitamin B2 showed markedly higher growth performance, feed intake, feeding speed, and Aristotle’s lantern (AL) reflex frequency. They also showed markedly shorter righting response time. The dietary level of 15 mg/kg vitamin B2 was found to significantly increase the collagen deposition in multiple tissues, including the spine joint, peristomial membrane (PM), AL muscle, and digestive tract. Meanwhile, sea urchins fed with 15 mg/kg vitamin B2 exhibited the most extensive and densely organized collagen fiber regions in the PM. Further study showed that 15 mg/kg vitamin B2 supplementation significantly upregulated the expression levels of COLP1α, TGFβR2, COLP2α, TGFβR1, COLP3α, and SNIP1 genes in the PM of sea urchins, while downregulated the expression level of MMP14. The results indicated that vitamin B2 promoted the exercise and feeding capacity of M. nudus by facilitating collagen production, potentially through activation of the TGF-β/Smad pathway.