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Loach is a facultative air-breather.To obtain air,loach swim vertically from the bottom to water surface.Vertical swimming is relatively uncommon in fish and largely unknown.In this study,horizontal and vertical free-swimming behavior of weather loach (Misgurnus anguillicaudatus)(body length: 11.7 ± 2.1 cm) were characterized.The results showed no significant difference between swimming speeds of ascending (mean: 0.995 ± 0.169 BL/s;maximum: 2.789 ± 0.787 BL/s)and descending (mean: 0.932±0.228 BL/s;maximum: 3.286±1.170 BL/s) during vertical swimming The horizontal speeds (mean: 2.078 ± 0.842 BL/S;maximum: 5.886±2.897 BL/s) were significantly higher than the vertical ones.