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首页> 外文期刊>Aquatic Toxicology >Metabolic trade-off between locomotion and detoxification for maintenanceof blood chemistry and growth parameters by rainbow trout (Oncorhynchusmykiss) during chronic dietary exposure to copper
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Metabolic trade-off between locomotion and detoxification for maintenanceof blood chemistry and growth parameters by rainbow trout (Oncorhynchusmykiss) during chronic dietary exposure to copper

机译：运动和排毒之间的代谢权衡，以维持虹鳟（Oncorhynchusmykiss）在长期饮食中摄入铜后的血液化学和生长参数

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The aim of this study was to obtain a holistic view of the sublethal toxic responses, and compensations, of fish exposed to Cu in the diet. Rainbow trout were fed to appetite on either a Cu-loaded diet (500 mg Cu kg(-1) dw) or a control diet (11.9 mg Cu kg(-1) dw) for 3 months. Nutritional performance, blood and muscle chemistry, histology, respiration, and swimming behaviour were measured. Copper concentration in intestine and liver of exposed fish was 16 and 2.5 times greater than in controls respectively, confirming oral Cu exposure. [Cu] remained low in the gills of fish irrespective of Cu treatment (< 0.096 mu mol g(-1) dw). Hepatic and intestinal metallothionien levels increased 8-and 1.5-fold, respectively, in Cu-treated fish compared to controls. Growth rate, appetite, food conversion ratios, carcass composition, oxygen consumption and ventilation rate in exposed fish were not different from controls. There were no treatment related changes in serum chemistry (glucose, triglycerides, protein, Na, K, Hb) or the mineral composition of skeletal muscle (Ca, Mg, Zn, Na, or K). However, quantitative histology showed a 9% increase in gill secondary lamellae length, together with lipid depletion in the livers of copper treated fish compared to controls. Routine swimming activity was affected significantly by oral Cu exposure. Time spent swimming was 35% lower in Cu-exposed fish after 3 months, while total distance moved was reduced by only 21% because mean swimming speed was 12% higher in contaminated fish. Maximum speeds attained by exposed fish were not different compared to controls. Exposed fish lowered activity overall by decreasing time spent swimming at low (1-17 cm s(-1)) and medium speeds (17-40 cm s(-1)), whilst increasing proportionately time spent fast swimming (40-58 cm s(-1)). These results are discussed in terms of sub-lethal oral Cu affecting the partitioning of energy utilisation between locomotion and maintenance metabolism by trout in a physiological drive towards invariant growth rates. (C) 1999 Elsevier Science B.V. All rights reserved. [References: 48]
机译：这项研究的目的是全面了解饮食中暴露于铜的鱼的亚致死毒性反应和补偿。虹鳟鱼以含铜饮食（500 mg Cu kg（-1）dw）或对照饮食（11.9 mg Cu kg（-1）dw）进食，持续3个月。测量了营养性能，血液和肌肉化学，组织学，呼吸和游泳行为。暴露的鱼肠和肝脏中的铜浓度分别比对照高16倍和2.5倍，证实口服铜暴露。不论铜处理如何，鱼fish中的[Cu]含量都较低（<0.096μmol g（-1）dw）。与对照组相比，经铜处理的鱼肝和肠金属硫蛋白水平分别增加了8倍和1.5倍。暴露鱼类的生长率，食欲，食物转化率，car体组成，耗氧量和通风率与对照组无差异。血清化学（葡萄糖，甘油三酸酯，蛋白质，Na，K，Hb）或骨骼肌的矿物质组成（Ca，Mg，Zn，Na或K）没有与治疗相关的变化。但是，定量组织学显示，与对照组相比，铜处理鱼的secondary次生薄片长度增加9％，并且肝脏中的脂质消耗减少。口服铜暴露会显着影响日常游泳活动。三个月后，暴露于铜的鱼的游泳时间减少了35％，而总移动距离仅减少了21％，因为受污染的鱼的平均游泳速度提高了12％。与对照组相比，裸露的鱼达到的最大速度没有差异。暴露的鱼类通过减少在低速（1-17 cm s（-1））和中等速度（17-40 cm s（-1））上游泳的时间降低了总体活动，而在快速游泳（40-58 cm）上所花的时间则成比例地增加了s（-1））。这些结果以亚致死性口服铜影响鳟鱼在运动和维持新陈代谢之间的能量利用分配的方式，以鳟鱼的生理驱动力朝着恒定的生长速度进行了讨论。 （C）1999 Elsevier Science B.V.保留所有权利。 [参考：48]

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