Fish feeds supplemented with calcium-based buffering minerals decrease stomach acidity, increase the blood alkaline tide and cost more to digest.
Fish feeds supplemented with calcium-based buffering minerals decrease stomach acidity, increase the blood alkaline tide and cost more to digest.
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DOI：
10.1038/s41598-022-22496-3
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发表时间：
2022-11-02
影响因子：
4.6
通讯作者：
中科院分区：
文献类型：
--
作者：
野生的掠食性鱼类会吃掉整个猎物，包括坚硬的骨骼部分，如贝壳和骨头。贝壳和骨头由缓冲矿物质碳酸钙（CaCO 3）和磷酸钙（Ca 3（PO 4）2）组成。这些矿物质可以抵抗pH值的变化，这意味着它们可能对鱼类的胃酸度、消化和代谢产生生理影响。采用等热量饲料添加CaCO 3、Ca 3（PO 4）2或CaCl 2作为非缓冲对照，研究了饲料缓冲对虹鳟幼鱼（Oncorhynchus mykiss）消化能量消耗（SDA）、胃pH值、餐后血液pH值（“碱潮”）和生长的影响。在21天的试验中，饮食缓冲的增加与胃食糜pH值、餐后血HCO 3-、净碱排泄、总SDA和峰值SDA的增加显著相关，但不影响生长效率。这一结果表明，没有营养价值的膳食方面可以影响与鱼类消化相关的生理和能量成本，但SDA的减少并不总是导致生长效率的提高。我们讨论了更广泛的影响，这些研究结果对鱼类的胃肠道生理，权衡猎物的选择，在野生，人为变暖和饲料配方水产养殖。
Predatory fish in the wild consume whole prey including hard skeletal parts like shell and bone. Shell and bone are made up of the buffering minerals calcium carbonate (CaCO3) and calcium phosphate (Ca3(PO4)2). These minerals resist changes in pH, meaning they could have physiological consequences for gastric acidity, digestion and metabolism in fish. Using isocaloric diets supplemented with either CaCO3, Ca3(PO4)2 or CaCl2 as non-buffering control, we investigated the impacts of dietary buffering on the energetic cost of digestion (i.e. specific dynamic action or SDA), gastric pH, the postprandial blood alkalosis (the “alkaline tide”) and growth in juvenile rainbow trout (Oncorhynchus mykiss). Increases in dietary buffering were significantly associated with increased stomach chyme pH, postprandial blood HCO3−, net base excretion, the total SDA and peak SDA but did not influence growth efficiency in a 21 day trial. This result shows that aspects of a meal that have no nutritional value can influence the physiological and energetic costs associated with digestion in fish, but that a reduction in the SDA will not always lead to improvements in growth efficiency. We discuss the broader implications of these findings for the gastrointestinal physiology of fishes, trade-offs in prey choice in the wild, anthropogenic warming and feed formulation in aquaculture.
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DOI：
10.1086/physzool.64.1.30158524
发表时间：
1991-01-01
期刊：
PHYSIOLOGICAL ZOOLOGY
影响因子：
--
作者：
BROWN, CR;CAMERON, JN
通讯作者：
CAMERON, JN
影响因子：
2
作者：
Couturier, C. S.;Andersen, N. G.;Chabot, D.
通讯作者：
Chabot, D.
影响因子：
2
作者：
Ern, R.;Huong, D. T. T.;Wang, T.
通讯作者：
Wang, T.
DOI：
10.1086/physzool.61.6.30156159
发表时间：
1988-11-01
期刊：
PHYSIOLOGICAL ZOOLOGY
影响因子：
--
作者：
GESSAMAN, JA;NAGY, KA
通讯作者：
NAGY, KA
影响因子：
2.5
作者：
Albins, Mark A.
通讯作者：
Albins, Mark A.