Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
The Salish sucker (Catostomus sp. cf. catostomus) is a federally Threatened species in Canada, inhabiting small lowland streams along with juvenile coho salmon (Oncorhynchus kisutch) in southwestern British Columbia and adjacent Washington State. Experiments were conducted in two ponds to determine the effects of reduced flow on dissolved oxygen, growth of stocked Salish sucker and juvenile coho salmon (Oncorhynchus kisutch), and fish movement using passive integrated transponder (PIT) tags. Sequential flow reduction in the first experiment resulted in a significant decrease in dissolved oxygen (9.1 to 3.1 mg·L−1) and Salish sucker growth (23% decline), although lower dissolved oxygen and growth were confounded with decreased temperature. Flow reduction in a second split-pond experiment including coho salmon resulted in significantly lower dissolved oxygen (6.9 to 2.9 mg·L−1), a 51% reduction in growth of coho salmon, but no detectable change in Salish sucker growth. PIT tag detections demonstrated increased use by both species of a well-oxygenated refuge in the flow reduction treatment, indicating sublethal effects of hypoxia on fish behaviour and habitat use. These experiments demonstrate the induction of severe hypoxia by reduced flows under eutrophy, with the potential for negative impacts on Salish sucker and juvenile coho salmon growth and habitat use.

中文翻译：

---

实验流量操作对受威胁的 Salish 吸盘（Catostomus sp. cf. catostomus）和幼年银鲑鱼（Oncorhynchus kisutch）的水质、缺氧和生长的影响

加拿大渔业和水产科学杂志，提前印刷。
Salish 吸盘 (Catostomus sp. cf. catostomus) 是加拿大联邦受威胁的物种，与不列颠哥伦比亚省西南部和邻近的华盛顿州的幼年银鲑鱼 (Oncorhynchus kisutch) 一起栖息在低地小溪流中。在两个池塘中进行了实验，以确定流量减少对溶解氧、放养的 Salish 吸盘和幼银鲑鱼 (Oncorhynchus kisutch) 的生长以及使用被动集成转发器 (PIT) 标签的鱼类运动的影响。第一个实验中的连续流量减少导致溶解氧显着减少（9.1 至 3.1 mg·L-1）和 Salish 吸盘生长（下降 23%），尽管较低的溶解氧和生长与温度降低相混淆。包括银鲑鱼在内的第二个分池实验中的流量减少导致溶解氧显着降低（6.9 至 2.9 mg·L-1），银鲑鱼的生长减少了 51%，但在 Salish 吸盘的生长中没有可检测到的变化。PIT 标签检测表明，两种物种在流量减少处理中都增加了氧气充足的避难所的使用，表明缺氧对鱼类行为和栖息地使用的亚致死影响。这些实验表明，富营养化条件下的流量减少会导致严重缺氧，这可能对 Salish 吸盘和银鲑幼鱼的生长和栖息地利用产生负面影响。PIT 标签检测表明，两种物种在流量减少处理中都增加了氧气充足的避难所的使用，表明缺氧对鱼类行为和栖息地使用的亚致死影响。这些实验表明，富营养化条件下的流量减少会导致严重缺氧，这可能对 Salish 吸盘和银鲑幼鱼的生长和栖息地利用产生负面影响。PIT 标签检测表明，两种物种在流量减少处理中都增加了氧气充足的避难所的使用，表明缺氧对鱼类行为和栖息地使用的亚致死影响。这些实验表明，富营养化条件下的流量减少会导致严重缺氧，这可能对 Salish 吸盘和银鲑幼鱼的生长和栖息地利用产生负面影响。