Impact of short-term total dissolved gas supersaturation on cognitive function and swimming performance in medaka (Oryzias latipes)

IF 6 3区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Sciences Europe Pub Date : 2024-10-03 DOI:10.1186/s12302-024-01004-6
Jialin Liao, Hui Chen, Xin Yang, Haoran Shi, Quan Yuan
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Abstract

During the flood season, high dam discharge rates result in total dissolved gas (TDG) supersaturation. This condition causes gas bubble trauma and can lead to fish mortality, which poses a significant threat to downstream river ecosystems. Assessing the ecological risks of TDG supersaturation is a challenge in waterpower-intensive river basins worldwide. Few studies have explored the impact of TDG supersaturation on fish behaviours, such as aggression and memory, which are crucial for feeding, reproduction, and predator avoidance. In this study, behavioural tests were conducted in a T-maze to investigate the effects of acute TDG supersaturation on swimming behaviour, aggression, and memory in medaka (Oryzias latipes). The results demonstrated that medaka exposed to TDG levels of 115% and 130% for 2 h had significantly reduced swimming performance.At TDG levels of 100%, 115% and 130%, medaka activity rates in the mirror arm of the maze in the mirror test were 44.34 ± 12.88%, 40.27 ± 15.44% and 35.35 ± 16.07%, respectively. Similarly, the activity rates of medaka in the active stimulus arm of the maze in the memory test were 50.35 ± 14.75%, 40.76 ± 12.51% and 35.35 ± 18.47%, respectively. The behaviour of medaka changed with increasing TDG supersaturation. These findings contribute to the development of an ecological risk assessment model for TDG supersaturation based on memory and aggression in fish and provide data for developing management strategies to mitigate the adverse effects of TDG supersaturation.

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短期总溶解气体过饱和度对鳉鱼认知功能和游泳表现的影响
在洪水季节,大坝的高排水率会导致总溶解气体 (TDG) 过饱和。这种情况会造成气泡创伤,导致鱼类死亡,对下游河流生态系统构成严重威胁。评估 TDG 过饱和的生态风险是全球水力密集型流域面临的一项挑战。很少有研究探讨了 TDG 过饱和对鱼类行为的影响,如攻击性和记忆力,它们对摄食、繁殖和躲避捕食者至关重要。本研究在 T 型迷宫中进行了行为测试,以研究急性 TDG 过饱和对青鱼(Oryzias latipes)游泳行为、攻击性和记忆的影响。结果表明,将青鳉暴露在 115% 和 130% 的 TDG 水平下 2 小时后,其游泳性能明显降低。在 100%、115% 和 130% 的 TDG 水平下,青鳉在迷宫镜像臂中的镜像测试活动率分别为 44.34 ± 12.88%、40.27 ± 15.44% 和 35.35 ± 16.07%。同样,在记忆测试中,青鳉在迷宫主动刺激臂的活动率分别为(50.35 ± 14.75%)、(40.76 ± 12.51%)和(35.35 ± 18.47%)。青鳉的行为随 TDG 过饱和度的增加而变化。这些研究结果有助于建立基于鱼类记忆和攻击性的 TDG 过饱和生态风险评估模型,并为制定管理策略以减轻 TDG 过饱和的不利影响提供数据。
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来源期刊
Environmental Sciences Europe
Environmental Sciences Europe Environmental Science-Pollution
CiteScore
11.20
自引率
1.70%
发文量
110
审稿时长
13 weeks
期刊介绍: ESEU is an international journal, focusing primarily on Europe, with a broad scope covering all aspects of environmental sciences, including the main topic regulation. ESEU will discuss the entanglement between environmental sciences and regulation because, in recent years, there have been misunderstandings and even disagreement between stakeholders in these two areas. ESEU will help to improve the comprehension of issues between environmental sciences and regulation. ESEU will be an outlet from the German-speaking (DACH) countries to Europe and an inlet from Europe to the DACH countries regarding environmental sciences and regulation. Moreover, ESEU will facilitate the exchange of ideas and interaction between Europe and the DACH countries regarding environmental regulatory issues. Although Europe is at the center of ESEU, the journal will not exclude the rest of the world, because regulatory issues pertaining to environmental sciences can be fully seen only from a global perspective.
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