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首页> 外文期刊>Aquaculture >Impact of high water carbon dioxide levels on Atlantic salmon smolts(Salmo salar L.): Effects on fish performance, vertebrae compositionand structure
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Impact of high water carbon dioxide levels on Atlantic salmon smolts(Salmo salar L.): Effects on fish performance, vertebrae compositionand structure

机译：高水二氧化碳水平对大西洋鲑鱼（Salmo salar L.）的影响：对鱼类生产，椎骨组成和结构的影响

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摘要

The role of high carbon dioxide (CO sub(2)) levels on fish performance, bone structure/composition and as a potential cause of spinal deformities was studied. Two groups of fish were exposed to a low (control) and a high level of CO sub(2) for 135 days during the freshwater period. After smoltification, the fish were transferred to seawater and followed up for 517 days until they reached harvest weight (3.1 kg BW). Differences in body weight between the control and high CO sub(2) groups were observed. At the end of the freshwater period, average weight in the group exposed to high CO sub(2) levels was 20.9% lower than in the control group. Specific growth rates (SGR) from the start of the experiment (10 g BW) to smolt stage were 1.63+/-0.04 and 1.36+/-0.01 for the control group and the high CO sub(2) group, respectively. Differences in body weight were maintained during the initial stages of the seawater period, but were not observed at harvest weight. Nephrocalcinosis was not observed in any of the experimental groups at the end of the freshwater period and no external signs of spinal deformities were observed either at smolt stage or at harvest weight. X-rays revealed mild abnormalities in some vertebrae bodies, which could not be related to any experimental group. Despite the lack of signs of pathological bone alterations, the histological examination suggested that the exposure to high CO sub(2)levels resulted in an increase in trabeculae volume and a higher rate of bone remodeling at the end of the freshwater period. Furthermore, fish exposed to a high CO sub(2) level presented a higher bone ash content at the end of the freshwater period. These differences could not be observed at the end of the grow-out period.
机译：研究了高二氧化碳（CO sub（2））水平对鱼类性能，骨骼结构/组成的影响以及作为脊柱畸形的潜在原因的作用。在淡水时期，两组鱼暴露于低（对照）和高水平的CO sub（2）135天。溶解后，将鱼转移到海水中，并跟踪517天，直到达到收获体重（3.1千克体重）。观察到对照组和高CO sub（2）组之间的体重差异。在淡水期结束时，暴露于高CO sub（2）水平的组中的平均体重比对照组低20.9％。从实验开始（10 g BW）到蜕皮阶段的比生长率（SGR）分别为对照组和高CO sub（2）组的1.63 +/- 0.04和1.36 +/- 0.01。体重的差异在海水阶段的初始阶段得以维持，但在收获时并未观察到。在淡水阶段结束时，在任何实验组中均未观察到肾钙化病，并且在软体动物阶段或收获时未观察到脊柱畸形的外部迹象。 X线片显示某些椎体轻度异常，这与任何实验组均无关。尽管缺乏病理性骨改变的迹象，但组织学检查表明，暴露于高CO sub（2）水平会导致小梁体积增加，并且在淡水阶段结束时骨重塑率更高。此外，暴露在高CO sub（2）水平下的鱼在淡水阶段结束时呈现出更高的骨灰含量。在成长期结束时无法观察到这些差异。

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