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A 3 × 4 factorial design was used to evaluate the dietary protein requirement and to determine the optimum dietary protein to energy (P/DE) ratio in sub‐yearling Persian sturgeon, Acipenser persicus, reared in the indoor system. Twelve experimental diets (40P16, 40P17, 40P18, 40P19, 45P19, 45P17, 45P18, 45P19, 50P16, 50P17, 50P18 and 50P19) were formulated and prepared to contain three protein levels...
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