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Effect of oral administration of a single bolus of six different protein sources on digestive physiology of red seabream Pagrus major juveniles

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Abstract

To reveal direct effects of various protein sources on digestive physiology of red seabream, Pagrus major (38.5 ± 0.4 g), six different protein sources of fishmeal (FM), soybean meal (SBM), corn gluten meal (CGM), soy protein concentrate (SPC), poultry by-product meal (PBM), and poultry-feather meal (PFM) were orally administered to fish (2 mg protein/g body weight) and sampled at 1.5 h and 3 h after administration. Gallbladder weight of fish administered FM, PBM, and PFM decreased after administration (p < 0.0001), while no difference was observed in the other ingredients compared to a non-protein sham control group, indicating that animal protein sources could more strongly stimulate bile secretion than plant protein sources in red seabream. Trypsin and chymotrypsin activity in the intestinal content markedly increased by the FM, SBM, and PFM administration (p < 0.0001). Lipase and amylase activity was also increased by FM and SBM but also by CGM for lipase and by PBM and PFM for amylase (p < 0.0001). These indicate that stimulation effect of the secretion of digestive enzymes is largely different among the protein sources. This might be due to the absorptive capacity of the protein source since intestinal absorption parameter genes (anpep, cpa, ggt1, and atp1a2) also increased by the FM, SBM, PBM or PFM (p < 0.05). In addition to the secretion levels of bile and digestive enzymes, gene expression levels of bile related genes (cyp7a1, cyp8b1, and shp) and digestion-regulating genes (casr and cck) were increased by the FM, SBM, PFM, and/or PBM administration, suggesting that animal proteins and SBM could be potent digestive stimulants compared to CGM and SPC. This study first revealed that single protein sources directly influence digestive enzyme secretion and bile secretion in fish. Information about the direct effect of each single source on digestive physiology could help to design feed formulation with less fishmeal.

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All data generated or analyzed during this study are included in this published article and its supplementary information files.

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Funding

This work was supported by the Fisheries Agency of Japan (Research project for transformation of the aquaculture industry into a growth industry) (KM, FT, HM, HY, TY, HF), the Japan Fisheries Research and Education Agency, and the JSPS KAKENHI (Grant number JP18K05837) (KM).

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KM, FT, HM, HY, and HF designed and conceptualized the project. KM, FT, TY, and HO prepared materials administered fish. All authors contributed to the formal analysis and investigation. The first draft of the manuscript was written by KM and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Koji Murashita.

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All experimental fish were handled and treated in accordance with the Guidelines for Animal Experimentation at the Fisheries Technology Institute, Japan Fisheries Research and Education Agency.

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The authors declare no competing interests.

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Murashita, K., Takakuwa, F., Matsunari, H. et al. Effect of oral administration of a single bolus of six different protein sources on digestive physiology of red seabream Pagrus major juveniles. Fish Physiol Biochem 48, 939–954 (2022). https://doi.org/10.1007/s10695-022-01096-y

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  • DOI: https://doi.org/10.1007/s10695-022-01096-y

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