Ruiz Nuria, García-Meilán Irene, Khansari Ali Reza, Teles Mariana, Pastor Josep, Tort Lluís
Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, Barcelona, Spain.
Department of Cell Biology, Physiology and Immunology, Universitat de Barcelona, Barcelona, Spain.
Front Physiol. 2024 Feb 8;15:1289903. doi: 10.3389/fphys.2024.1289903. eCollection 2024.
Under climate change, the increase in temperature in aquatic environments may induce oxygen depletion. In extreme cases, low oxygen may become a limiting factor for fish, thus generating stress. In addition, consecutive hypoxic episodes may complicate the recovery of individuals and hinder their ability to modulate physiological and biochemical responses to maintain homeostasis. Thus, the aim of this study was to determine the hematological and physiological responses of rainbow trout under a condition of repeated hypoxic and manipulation stresses at three different time points. Every hypoxic episode consisted of exposing the fish to low dissolved oxygen concentrations (2 mgO/L for 1 h). Following the exposure, the fish were allowed to recover for 1 h, after which they were sampled to investigate hematological and physiological parameters. The results showed a pattern of habituation reflected by values of hematocrit, hemoglobin, and mean corpuscular volume, indicating a certain ability of rainbow trout to resist this type of repeated hypoxic events, provided that the fish can have some recovery time between the exposures.
在气候变化的影响下，水生环境温度的升高可能会导致氧气耗尽。在极端情况下，低氧可能成为鱼类的限制因素，从而产生应激。此外，连续的缺氧事件可能会使个体的恢复过程变得复杂，并阻碍它们调节生理和生化反应以维持体内平衡的能力。因此，本研究的目的是确定虹鳟鱼在三个不同时间点反复遭受缺氧和操作应激条件下的血液学和生理反应。每次缺氧事件包括将鱼暴露于低溶解氧浓度（2mgO/L，持续1小时）。暴露后，让鱼恢复1小时，之后对其进行采样以研究血液学和生理参数。结果显示，红细胞压积、血红蛋白和平均红细胞体积的值反映出一种适应模式，这表明虹鳟鱼具有一定能力抵抗这种类型的反复缺氧事件，前提是鱼在两次暴露之间有一定的恢复时间。
