| 61healthy Leptobotia elongates were collected in the section from Chongqing to Jiangjin in June2013. A swimming tunnel was adopted to test the critical swimming speed and burst swimming speed of wild Leptobotia elongates with video, in the meantime, YSI550was used to measure the oxygen consumption of Leptobotia elongates in the process of testing the critical swimming speed. In a word, the swimming speed, swimming behavior and activity metabolism of Leptobotia elongates were preliminary studied in this thesis, which could provide basic data for behavior selection and transformation law of energy metabolism of Leptobotia elongates under different water velocity and could alsoreveal the swimming behavior patterns of Leptobotia elongates.The main results are shown as follows:1. The Ucrit-a of Leptobotia elongates was between94.78cm/s and186.60cm/s, and the Ucrit-r of Leptobotia elongates was between3.73BL/s and18.66BL/s. The body length of Leptobotia elongates was significantly correlated with Ucrit-a and Ucrrt-r respectively, among which Ucrit-r decreases with the increase of body length. The body length and Ucrit-r of the same length group were averaged, and the three linear regression equation of the averaged body length and averaged Ucrit-r was Y1=-0.0026X3+0.2117X2-5.7688X+57.365(R2=0.9785)2. There was no significant correlation between the body length and Uburst-a and Usprinr-a of Leptobotia elongates, respectively, but Uburst-r and Usprint-r were significant negative correlated with the body length of Leptobotia elongates. The three linear regression equation of the averaged body length and averaged Uburst-r wasY2=-0.0022X3+0.1506X2-3.6708X+39.587(R2=0.8494), the equation of the averaged body length and averaged Usprint-r was Y3=0.0009X3-0.0283X2-0.7192X+30.778(R2=0.9535)The result of t-test showed that the Usprint-r is significant higher than Uburst-r of Leptobotia elongates under the same body length and same objective environment, but the differentiation decreases with the increase of body length.3. There were two AMR peak of the small length group with the continuous increase of flow velocity at the water temperature of25±0.5℃,, and the largest AMR appeared at the maximum velocity phase was (954.55±230.76) mgO2/(kg-h). But the AMR peak of the other two groups were (547.48±269.97) mgO2/(kg-h) and (458.85±167.34)mgO2/(kg-h) respectively, which both appeared at the flow velocity6BL/s.4. Under the same water temperature (25±0.5℃), COT of the three body length groups (14±0.79cm,18±0.66cm,22±0.98cm) present increase first and then decreases again with the increase of flow velocity. Each group had two COT lows with the increasing velocity and the COT lows were (2.00±1.04) J/(m·kg) and (1.39±0.54) J/(m·kg) at the longest fish length group;(1.22±0.66) J/(m·kg) and (0.75±0.18) J/(m·kg) at the medium fish length group;(1.07±0.54) J/(m·kg) and (1.04±0.49) J/(m·kg) at the shorted fish length group, which were all lower than COT at the minimum flow velocity1BL/s.5. Under the same water temperature (25±0.5 ℃), there were no significant different of AMR and COT of each group at the velocity lower than9BL/s. But when the velocity higher than9BL/s, Leptobotia elongates in the longest and medium fish length groups present a state of exhaustion, to the contrary, the AMR and COT of the shortest fish length group increased again. In addition, the value of COT of small length group (14±0.79cm) was significantly higher than the other two groups (18±0.66cm,22±0.98cm) when the flow velocity lower than9BL/s.6. Under the same water temperature (25±0.5℃), the TBF of three groups Leptobotia elongates(10.5±1.13cm,15.5±1.21cm,21.5±1.11cm)increased with the increase of flow velocity, but there were significant differences of TBF of each group when close to the state of exhaustion. The TBF of the shortest length group (10.5±1.13cm) was significant higher than the other two groups (15.5±1.21cm,21.5±1.11cm) during the stage of movement beginning and exhaustion, and yet, there were no significant differences at other stages. During the velocity of exhaustion, there were significant differences of TBF of each group. The TBF of the longest length group (21.5±1.11cm) expressed increasing trend, the TBF of the medium length group (15.5±1.21cm) expressed invariability trend and the TBF of the shortest length group (10.5±1.13cm) expressed decreasing trend.7. Under the same water temperature (25±0.5℃), the result based on the video showed that the swimming time of Leptobotia elongates was first increased and then decreased, which was accompanied by "sprint-slide" rate increasing and decreasing. During the critical speed testing experiment, Leptobotia elongates express swimming peak at least once, and before the peak accompanying by an increasing area of "sprint-slide" rate.8. Leptobotia elongates possess strong ability of swimming, especially on burst swimming. It was good at the way of intermittent swimming to complete swimming. Its ability of anaerobic swimming could be improved by training in acquired. It had a range of being appropriate for swimming. |
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