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在28℃水温下,采用特制的鱼类游泳行为测定装置,研究体重(125.94±13.87)g的红鳍银鲫(Barbodes schwanenfeldi)幼鱼在0.0m/s(对照组)和0.1m/s、0.3m/s、0.5m/s3种流速下的游泳行为。结果表明,从0.0～0.3m/s,红鳍银鲫幼鱼平均趋流率和摆尾频率均随着流速的增加而增大,而0.5m/s组在90min内随时间延长而下降。红鳍银鲫游泳状态明显受到所处流速的影响,在静水对照组以“逆流前进”和“顺流而下”为主,两者共占总观察时间的98%以上;各流速组均以逆流静止为主,且随着流速的增大,逆流静止所占时间比例从45.8%增加至81.3%,而逆流前进所占时间比例由24.1%减至5%以下;逆流后退所占时间比例以0.1m/s组最大,为16.4%;顺流而下的比例随着流速增大先减小后增大,3个流速组依次为13.7%、2.1%和10.9%。红鳍银鲫幼鱼的游泳速度(V)和摆尾频率(TBF)在逆流前进及逆流静止两种游泳状态下呈线性正相关,而在逆流后退和顺流而下两种状态下两者没有显著相关。
At a water temperature of 28 ℃, a special fish swimming behavior measuring device was used to study the effects of 0.08 / s (control group) and 0.1m / s weight of Barbodes schwanenfeldi juvenile (125.94 ± 13.87 g) 0.3m / s, 0.5m / s 3 kinds of flow rate of swimming behavior. The results showed that from 0.0 to 0.3 m / s, the mean flow rate and the tail frequency of juvenile red crucian carp increased with the increase of flow rate, while the rate of 0.5 m / s decreased with the increase of time within 90 min. The swimming status of the red-fin carp was obviously influenced by the flow rate. The control group was dominated by “upstream” and “downstream”, both of which accounted for more than 98% of the total observation time. As the flow velocity increases, the proportion of time remaining in countercurrent flow increases from 45.8% to 81.3%, while the time proportion of forward flow decreases from 24.1% to below 5%. The countercurrent retreat The proportion of time-flow to 0.1m / s is the largest, which is 16.4%. The proportion of downflow decreases first and then increases with the increase of flow rate. The three flow rates are 13.7%, 2.1% and 10.9% respectively. The swim speed (V) and the tail-tailed frequency (TBF) of juvenile redfin crucian carp showed a linear positive correlation with the countercurrent forward and the countercurrent stationary two swimming states, but both in the backward flow backward and downstream Significant correlation.