Incidental capture of sharks during commercial and recreational fishing is of major conservation concern because of the potential effects it can have on physiological stress responses and survival. Endocrine aspects of the stress response are, however, poorly understood in elasmobranchs because of difficulties in measuring the primary glucocorticoid (1α-hydroxycorticosterone). Here, we combined measures of plasma adrenocorticotropic hormone (ACTH), the highly conserved pituitary hormone responsible for stimulating the release of adrenal/interrenal glucocorticoids, with measures of plasma lactate, osmolality, hematocrit, and behavior to gain a greater understanding of the capture stress response in Atlantic Sharpnose sharks, Rhizoprionodon terraenovae. Individuals were subject to a non-repeated measures blood sampling protocol in which blood samples were obtained following exposure to capture stress for <3 min (designated baseline), and 15, 30, 45 and 60 min, after which behavior was categorized during release. Results revealed that ACTH was significantly higher at 15, 30, 45, and 60 min than at baseline. Lactate levels were highest at 45 and 60 min whereas osmolality and hematocrit did not differ significantly among the sampling periods. Lactate was the only variable to significantly predict the shark's behavior upon release with higher lactate levels correlating with sluggish behavior. Measurements of stress indicators are important in understanding the effects of capture on shark populations, which has been implicated in population declines.

中文翻译：

---

循环中的促肾上腺皮质激素水平，乳酸水平，血细胞比容和重量克分子渗透压浓度与大西洋尖鼻鲨（Rhizooprionodon terraenovae）捕获压力的关系。

在商业和休闲捕鱼中偶然捕获鲨鱼是主要的保护问题，因为它可能对生理应激反应和生存产生潜在影响。然而，由于难以测量初级糖皮质激素（1α-羟基皮质酮），因此在弹性分支中对应激反应的内分泌方面了解甚少。在这里，我们将血浆促肾上腺皮质激素（ACTH）（一种高度保守的垂体激素，负责刺激肾上腺/肾间糖皮质激素的释放）与血浆乳酸，渗透压，血细胞比容和行为的措施结合起来，以更好地了解捕获压力大西洋锐齿鲨（Rhizooprionodon terraenovae）的反应。个体接受非重复措施的血液采样方案，其中在暴露于<3分钟（指定基准），15、30、45和60分钟的捕获压力后获得血样，然后在释放过程中对行为进行分类。结果显示，ACTH在第15、30、45和60分钟时明显高于基线。乳酸水平在45和60分钟时最高，而渗透压和血细胞比容在采样期间之间没有显着差异。乳酸是唯一能显着预测鲨鱼释放后的行为的变量，而乳酸水平较高则与缓慢的行为有关。压力指标的测量对于了解捕捞对鲨鱼种群的影响非常重要，而鲨鱼种群与鲨鱼种群的减少有关。