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首页> 外文期刊>ICES Journal of Marine Science >Food ingestion in juvenile cod estimated by inert lanthanide markers — effects of food particle size
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Food ingestion in juvenile cod estimated by inert lanthanide markers — effects of food particle size

机译：惰性镧系元素标记估计的少年鳕鱼中的食物摄入量-食物粒径的影响

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摘要

Development of formulated starter diets and improvement of diets for juvenile marine fish species are major challenges in aquaculture. The ingestion rate may be regarded as a parameter for evaluating whether a diet particle is available, recognized, of adequate size, palatable, and preferred by small fish. In this study, we evaluated the effect of food particle size (150—3425 μm) on ingestion rate in juvenile cod (36—826 mg wet weight). Lanthanide oxides were used as markers. Several mixtures of lanthanide marker-labelled diets were produced by combination of the mono-labelled size classes. Each combination was fed for one, four, or seven days to groups of juvenile cod in separate tanks. After termination by anaesthetic, the fish were collected, individually weighed, and frozen until analysis. The amount of lanthanides in the homogenized fish was measured by inductively coupled plasma-mass spectrometry (ICP-MS). There were no significant differences in ingestion of any of the markers when given in a mixture of mono-labelled particles. Thus, the markers Y_2O_3, La_2O_3, Nd_2O_3, Dy_2O_3, and Yb_2O_3 may be used as inert tools for evaluating diet ingestion. The total intake of dry diet was about 13 mg g~(-1) body weight. The particle size that caused the highest food intake was less than 1.2 mm in all experiments.
机译：发展配制的起始日粮和改善少年海水鱼类的日粮是水产养殖的主要挑战。摄食率可以被认为是评估食物颗粒是否可供食用，被识别，大小合适，可口以及被小鱼所偏爱的参数。在这项研究中，我们评估了食物粒度（150–3425μm）对少年鳕鱼（36–826 mg湿重）摄入速率的影响。镧系氧化物用作标记。通过单标记大小分类的组合，生产了几种镧系元素标记的日粮混合物。每种组合分别在单独的水箱中喂食成组的一，四或七天。麻醉终止后，收集鱼，分别称重并冷冻直至分析。均质鱼中镧系元素的含量通过电感耦合等离子体质谱法（ICP-MS）测定。在单标记颗粒的混合物中摄入任何标志物时，摄入均无显着差异。因此，标记Y_2O_3，La_2O_3，Nd_2O_3，Dy_2O_3和Yb_2O_3可用作评估饮食摄入的惰性工具。干燥饮食的总摄入量约为13 mg g〜（-1）体重。在所有实验中，导致最高食物摄入量的粒径均小于1.2毫米。

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