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Digested soybean protein and taurine influence bile acid level, lipase activity, lipid digestibility, and growth performance of pompano (Trachinotus blochii)

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Abstract

This study aimed to examine the effects of dietary digested soybean protein (DSP) and taurine on bile acid (BA) level, lipase activity, lipid apparent digestibility coefficient (ADC), and growth performance of pompano (Trachinotus blochii). Five diets were formulated with fish meal (FM), defatted soybean meal (SBM), and the DSP as main dietary protein sources. The diets were denoted as follows: FMD (FM-based diet), SBMD (SBM-based diet), SBM+TD (SBM-based diet plus taurine), DSPD (DSP-based diet), and DSP+TD (DSP-based diet plus taurine). Fingerling pompano with an initial body weight (BW) of 21.4 g were stocked in 500-L tanks, with triplicate tanks per dietary treatment. For 8 weeks, the fish were hand-fed the experimental diets to apparent satiation twice daily. The results showed that the DSPD and DSP+TD groups had significantly higher final BW, weight gain, and specific growth rate, but lower feed conversion ratio, than the SBMD and SBM+TD groups, respectively (P < 0.05). There were no significant differences in growth and feed performances between fish fed DSP+TD and FMD. The gallbladder and anterior intestinal BA levels, anterior intestinal lipase activity, and lipid and protein ADCs were markedly increased in fish fed DSPD and DSP+TD compared to those fed SBMD (P < 0.05), and no significant differences were detected between the DSP+TD and FMD groups. The findings of the present study suggested that dietary DSP inclusion with taurine supplementation might effectively improve lipid digestion and this contributed to growth enhancement in pompano fed a soybean protein–based diet.

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The data and materials that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

We express special thanks to the staff members of the National Broodstock Center for Mariculture Species, Research Institute for Aquaculture No. 1, for their support during the experiments. We also thank MSc. Nhien Minh Dinh and MSc. Giang Huong Dinh (Faculty of Biology, Hanoi National University of Education, Vietnam) for their support and technical assistance with fish sampling.

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Hung Phuc Nguyen is involved in the conception and design of the study and drafting of the manuscript. Hung Phuc Nguyen and Thinh Do Van contributed to acquisition of data, analysis and interpretation of data, and revision and approval of the final version of the manuscript.

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Correspondence to Hung Phuc Nguyen.

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The authors confirm that the ethical policies of the journal have been adhered to and approval from the appropriate Ethical Review Committee was received. The experimental fish were anesthetized with 400 ppm 2-phenoxyethanol before sampling, and the European Union standards for the protection of animals used for scientific purposes have been followed.

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The authors declare no competing interests.

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Nguyen, H.P., Van Do, T. Digested soybean protein and taurine influence bile acid level, lipase activity, lipid digestibility, and growth performance of pompano (Trachinotus blochii). Fish Physiol Biochem 47, 1199–1209 (2021). https://doi.org/10.1007/s10695-021-00972-3

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