Abstract：
Lumpfish (Cyclopterus lumpus) mortalities have been reported during the summer at some North Atlantic salmon cage-sites where they serve as \"cleaner fish.\" To better understand this species\' physiology and whether limitations in their metabolic capacity and thermal tolerance can explain this phenomenon, we compared the aerobic scope (AS) of 6°C-acclimated lumpfish (~50 g and 8.8 cm in length at the beginning of experiments) when all individuals (N = 12) were given a chase to exhaustion, a critical swim speed (Ucrit) test, and a critical thermal maximum (CTMax) test (rate of warming 2°C h-1). The Ucrit and CTMax of the lumpfish were 2.36 ± 0.08 body lengths per second and 20.6 ± 0.3°C. The AS of lumpfish was higher during the Ucrit test (206.4 ± 8.5 mg O2 kg-1 h-1) versus that measured in either the CTMax test or after the chase to exhaustion (141.0 ± 15.0 and 124.7 ± 15.5 mg O2 kg-1 h-1, respectively). Maximum metabolic rate (MMR), AS, and \"realistic\" AS (ASR) measured using the three different protocols were not significantly correlated, indicating that measurements of metabolic capacity using one of these methods cannot be used to estimate values that would be obtained using another method. Additional findings include that (1) the lumpfish\'s metabolic capacity is comparable to that of Atlantic cod, suggesting that they are not as \"sluggish\" as previously suggested in the literature, and (2) their CTMax (20.6°C when acclimated to 6°C), in combination with their recently determined ITMax (20.6°C when acclimated to 10°C), indicates that high sea-cage temperatures are unlikely to be the primary cause of lumpfish mortalities at salmon sea-cages during the summer.
摘要：
据报道，夏季在一些北大西洋鲑鱼笼场所，它们被用作“清洁鱼”。“为了更好地了解这个物种的生理学，以及它们的代谢能力和耐热性的限制是否可以解释这种现象，当所有个体（N=12）都被追寻精疲力尽时，我们比较了6°C适应的块状鱼（实验开始时长约50g和8.8cm）的有氧范围（AS），临界游泳速度(Ucrit)测试，和临界热最大值(CTMax)测试(升温速率2°Ch-1)。块状鱼的Ucrit和CTMax为每秒2.36±0.08体长和20.6±0.3°C。Ucrit试验期间（206.4±8.5mgO2kg-1h-1）的AS高于CTMax试验或追逐耗尽后的AS（141.0±15.0和124.7±15.5mgO2kg-1h-1，分别)。最大代谢率(MMR)AS,和使用三种不同方案测量的“现实”AS（ASR）没有显着相关，表明使用这些方法之一的代谢能力的测量不能用于估计使用另一种方法获得的值。其他发现包括（1）块状鱼的代谢能力与大西洋鳕鱼相当，这表明他们不像文献中先前所说的那样“迟钝”，和（2）他们的CTMax（适应6°C时的20.6°C），结合他们最近确定的ITMax（适应10°C时为20.6°C），表明在夏季，高的海笼温度不太可能是鲑鱼海笼中块状鱼死亡的主要原因。
