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Effects of dietary soy isoflavones on feed intake, growth performance and digestibility in juvenile Japanese flounder (Paralichthys olivaceus)

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Abstract

An 8-week feeding trial was conducted to investigate the effects of dietary soy isoflavones on feeding intake, growth performance, and digestion of juvenile Japanese flounder (Paralichthys olivaceus). Four isonitrogenous (49% crude protein) and isoenergetic (20.1 MJ kg−1) diets were formulated to contain four graded levels of soy isoflavones, namely, 0, 1, 4 and 8 g soy isoflavones in 1 kg of diet. Each diet was randomly fed to triplicate tanks of fish (Initial average weight: 2.58 g ± 0.01 g), and each tank was stocked with 35 fish. No significant difference was observed among diets with levels of 0, 1 and 4 g kg−1 soy isoflavones in feed intake, weight gain, feed efficiency ratio (FER), proximate composition of fish whole body and apparent digestibility coefficients (ADC) of nutrients and energy (P>0.05). However, high dietary soy isoflavones level (8 g kg−1) significantly depressed weight gain, FER, whole-body crude lipid content of fish and ADC of nutrients (P<0.05). These results indicate that high level of dietary soy isoflavones (above 4 g kg−1) significantly depresses growth responses and FER of Japanese flounder. However, as the content of soy isoflavones in soybean meal is around 1 to 3 g kg−1, the adverse effects might be neglected when soybean products are used as a fish feed ingredient.

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Authors and Affiliations

  1. Key Laboratory of Aquaculture Nutrition and Feed, Ministry of Agriculture, and the Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao, 266003, P. R. China

    Kangsen Mai, Yanjiao Zhang, Wei Chen, Wei Xu, Qinghui Ai & Wenbing Zhang

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  1. Kangsen Mai
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  2. Yanjiao Zhang
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  3. Wei Chen
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  4. Wei Xu
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  5. Qinghui Ai
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  6. Wenbing Zhang
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Correspondence to Kangsen Mai.

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Mai, K., Zhang, Y., Chen, W. et al. Effects of dietary soy isoflavones on feed intake, growth performance and digestibility in juvenile Japanese flounder (Paralichthys olivaceus). J. Ocean Univ. China 11, 511–516 (2012). https://doi.org/10.1007/s11802-012-2146-9

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  • DOI: https://doi.org/10.1007/s11802-012-2146-9

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