Feeding trial demonstrates that 0.5% dietary alpha-linolenic acid optimizes growth in juvenile sterlet sturgeon, indicating ideal nutrient targets for tailored aquaculture feeds.
An 8-week feeding trial evaluated the dietary essential fatty acid (EFA) requirements of juvenile sterlet sturgeon (Acipenser ruthenus, 37.1 g). Nine diets (45% protein, 10% lipid) were formulated with varying levels of linoleic acid (LA) and α-linolenic acid (LNA). The 0.5% LNA diet (LNA0.50) resulted in the highest weight gain, feed efficiency, and whole-body crude protein content (P<0.05). Increasing LNA to 1.0% did not improve growth but significantly elevated body lipid deposition (P<0.05). Whole-body fatty acid profiles directly reflected dietary compositions, showing dose-dependent accumulations. In conclusion, the optimal dietary LNA requirement for juvenile sterlet sturgeon is approximately 0.5% to maximize growth and nutrient retention, providing baseline data for customized sturgeon feed formulation.
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Dong-Hoon LEE (2026) studied this question.
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