关键词: TDG过饱和, 齐口裂腹鱼, 避难所, 显著性分析, 字母标记法

Abstract: To investigate the feasibility of constructing a total dissolved gas (TDG) supersaturation refuge for fishes in mountain rivers, half-year-old Schizothorax prenanti was used as the study object and a indoor model of TDG supersaturation was constructed. Laboratory quantitative tests under different TDG saturation conditions were carried out and the results were compared by means of mathematical statistics and significance analysis. The study showed that the evacuating trend of the fish gradually increased with the increase of TDG saturation. In the upper stream of main tank, with the TDG saturation under 130%, there was no obvious evacuating. When the TDG saturation reached 140%, the evacuation trend began to appear, and the evacuation effect was obvious when the TDG saturation reached 150% and above. At the end of the test, the evacuation rates had significant difference when TDG saturation was below 150%. The evacuation rate of the TDG saturation above 150% was extremely higher than that of the TDG saturation above 150%.

Key words: TDG supersaturation, refuge, Schizothorax prenanti, significance analysis, Alphabetical marking method