The Tolerance Characteristics of Resident Fish in the Upper Yangtze River under Varying Gas Supersaturation

• DOI: 10.3390/ijerph16112021
• Publication Date: 2019-06-07T07:56:31Z
• Authors: Qianfeng Ji; Shudan Xue; Quan Yuan; Yuan Yuan; Yuanming Wang; Ruifeng Liang; Jingjie Feng; Kefeng Li; Ran Li
• Keywords: Yangtze river; Supersaturation

In circumstances where total dissolved gas (TDG) levels are variable, the peak TDG and duration expected to be dominant drivers of fish survival. Focusing on in natural rivers, a laboratory experiment field experiments upper Yangtze River were conducted with Prenant’s Schizothoracin (Schizothorax prenanti), rare species inhabiting River, examine tolerance characteristics under varying supersaturation levels. The results showed that rivers changed greatly during flood period due reservoir regulation. survival was affected by levels, water depth fluctuation range. A high level, shallow compensatory caused mortality higher September than July. lower fluctuating constant supersaturation. varied depending duration. Under range 115–125%, 6 h–6 h cycle significantly different from 8 h–8 cycle. did not affect at 110–130%. Intermittent does increase fish. This study revealed resident supersaturation, which provides reference ecological operation reservoirs may contribute protection aquatic organisms.