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首页> 外文期刊>Journal of Fish Biology >Rate of energy depletion and overwintering mortality of juvenile walleye pollock in cold water.
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Rate of energy depletion and overwintering mortality of juvenile walleye pollock in cold water.

机译：少年角膜鳕在冷水中的能量耗竭率和越冬死亡率。

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The winter energy deficit and mortality of juvenile walleye pollock at extremely cold temperature were examined by field observations and laboratory experiments. In the Doto area, along the northern coast of Japan, juvenile walleye pollock resided on the continental shelf despite extremely cold temperatures (mean 0.4 degrees C) during the latter half of winter (March to April). Measurements of the rate of energy depletion (equivalent to the routine metabolic rate) revealed that juvenile walleye pollock consumed 37% less energy at 0.5 degrees C than at 2.0 degrees C, suggesting an energetic benefit of residence in cold water (<1.0 degrees C) over the shelf during winter. Prior to the starvation experiments, temperatures and ration level in the holding tanks were adjusted to create two different body condition groups of fish. Under the thermal condition of the latter half of winter (0.5 degrees C), fish with a mean condition factor of 0.6 and 0.5 suffered 19.1 and 74.5% mortality, respectively, at the end of the experiments (after 56 days). The residual analysis of total body energy demonstrated that the cause of mortality was mainly associated with the depletion of energy reserves. When a logistic regression model for mortality derived from the experiments was applied to wild fish collected in March, the estimated overwintering mortality in 2004 and 2005 was 25.4 and <2.3%, respectively, assuming no feeding during the winter. Considering that juvenile walleye pollock feed during winter as shown in previous studies, intense overwintering mortality induced by energy depletion is improbable during the latter half of winter in the Doto area.
机译：通过实地观察和实验室实验，研究了极冷温度下幼年角膜鳕的冬季能量缺乏和死亡率。在日本北海岸的渡渡地区，尽管在冬季的下半年（3月至4月）温度极低（平均0.4摄氏度），但幼年角膜白斑鳕仍栖息在大陆架上。对能量耗竭率（相当于常规代谢率）的测量表明，幼体角膜白斑鳕鱼在0.5摄氏度下的能量消耗比在2.0摄氏度下少37％，这表明居住在冷水中（<1.0摄氏度）具有有益的益处。在冬天在架子上。在饥饿实验之前，调节储水箱中的温度和定量水平，以创造两种不同体况的鱼。在冬季的后半部分（0.5摄氏度）的高温条件下，平均条件因子为0.6和0.5的鱼在实验结束时（56天后）分别遭受19.1和74.5％的死亡率。人体总能量的残留分析表明，死亡原因主要与能量储备的消耗有关。当对来自三月份采集的野生鱼类应用从实验得出的死亡率的逻辑回归模型时，假设冬季没有进食，则2004年和2005年的越冬死亡率估计分别为25.4和<2.3％。考虑到以前的研究表明，冬天会喂食幼年的角膜白斑鳕，因此在Doto地区冬季的下半年不太可能因能量消耗而导致过度的越冬死亡率。

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