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<p>The increasingly constrained supply and rising cost of fish oil pose a critical bottleneck to the sustainable development of aquaculture. To address this shortage, our study conducted a comprehensive evaluation of replacing 2% dietary fish oil ( FO) with EPA-rich <i>Nannochloropsis salina</i> oil ( NO) in juvenile largemouth bass (<i>Micropterus salmoides</i>) at either high or low FO levels. Four isonitrogenous and isolipidic diets were formulated: a relatively high FO group ( 6% FO + 4% soybean oil (SO), 6F4S), a low fish oil group ( 2% FO + SO 8%, 2F8S), and two NO replacement groups (4% FO + 4% SO + 2% NO, 4F4S2N; 8% SO + 2% NO, 8S2N). After a 56-day feeding trial, the 2F8S and 8S2N groups exhibited growth performance comparable to the 6F4S group, while the 4F4S2N group showed reduced growth. In terms of fatty acid composition, it is noteworthy that replacing 2% of FO with NO effectively maintained DHA levels in the muscle and liver. Moreover, this replacement strategy significantly improved the texture properties of the fish fillet, enhancing hardness, brittleness, springiness, and chewiness ( <i>P</i> &lt; 0.05). Physiological indices indicated that, although certain lipid transport markers showed changes, liver functions and oxidative stress levels remained stable across all treatment groups. Of particular importance, NO replacement significantly improved liver health, with a 40–45% reduction in the area of hepatic lipid droplets in the replacement groups (<i>P</i> &lt; 0.05), which may be associated with the upregulation of the lipid metabolism-related gene <i>pparα</i>. In conclusion, replacing 2% FO with 2% NO in a low fish oil baseline diet maintained growth, enhanced fillet texture, and improved liver health in juvenile largemouth bass, validating its use as a sustainable fish oil alternative.</p>

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Effects of replacing low level fish oil with Nannochloropsis salina oil on growth, fatty acids, flesh quality, liver antioxidant capacity and liver fat deposition of largemouth bass (Micropterus salmoides) juveniles

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Qiuwen Su,
  • Xu Jia,
  • Shanren Lan,
  • Yaowei He,
  • Tao Li,
  • Aiguo Zhou,
  • Huijuan Tang

摘要

The increasingly constrained supply and rising cost of fish oil pose a critical bottleneck to the sustainable development of aquaculture. To address this shortage, our study conducted a comprehensive evaluation of replacing 2% dietary fish oil ( FO) with EPA-rich Nannochloropsis salina oil ( NO) in juvenile largemouth bass (Micropterus salmoides) at either high or low FO levels. Four isonitrogenous and isolipidic diets were formulated: a relatively high FO group ( 6% FO + 4% soybean oil (SO), 6F4S), a low fish oil group ( 2% FO + SO 8%, 2F8S), and two NO replacement groups (4% FO + 4% SO + 2% NO, 4F4S2N; 8% SO + 2% NO, 8S2N). After a 56-day feeding trial, the 2F8S and 8S2N groups exhibited growth performance comparable to the 6F4S group, while the 4F4S2N group showed reduced growth. In terms of fatty acid composition, it is noteworthy that replacing 2% of FO with NO effectively maintained DHA levels in the muscle and liver. Moreover, this replacement strategy significantly improved the texture properties of the fish fillet, enhancing hardness, brittleness, springiness, and chewiness ( P < 0.05). Physiological indices indicated that, although certain lipid transport markers showed changes, liver functions and oxidative stress levels remained stable across all treatment groups. Of particular importance, NO replacement significantly improved liver health, with a 40–45% reduction in the area of hepatic lipid droplets in the replacement groups (P < 0.05), which may be associated with the upregulation of the lipid metabolism-related gene pparα. In conclusion, replacing 2% FO with 2% NO in a low fish oil baseline diet maintained growth, enhanced fillet texture, and improved liver health in juvenile largemouth bass, validating its use as a sustainable fish oil alternative.