长薄鳅耗氧率与窒息点的研究

The Asphyxiation Point and Oxygen Consumption Rate in Leptobotia elongata (Bleeker)

应用测定流水中溶氧量的方法，测定了长薄鳅的耗氧率、耗氧量及窒息点试验表明：长蒲鳅的耗氧率（Y＇）随鱼体重（W，g）的增加而降低，而耗氧量（Y）则随体重增加而增大，其关系式分别为：Y＇＝186．576W－0．2043，Y＝0．186w0．7962．温度对长薄鳅的耗氧率有影响，在13－30℃范围内．耗氧率随水温升高而逐渐增大耗氧率的温度敏感区域是13－23℃和28－30-℃，而在23－28℃范围内变化幅度较小，标准代谢量变化也较少．是长薄鳅生长的适宜温度长薄鳅的耗氧率具有昼夜节律性，耗氧高峰是在凌晨2：00，低谷是在下午16：00左右其窒息点在小体重组（平均体重为38－39g）为0．94－1．06mg／L；在大体重组（平均体重为250－3209）为0．62－0．

The oxygen consumption rate and asphyxiation Point of Lepobotia elongata (Bleeker) are studied by Krogh's method. The oxygen consumption rate (Y') of the fish decreases with the body weight increasing, while oxygen consumption (Y) increases with the body weight (W) increasing under water temperature 22 - 23℃. The regression line may be represented by the following equations respectively: Y' = 186. 576 W-0.2043 and Y=0: 186 W0.7962. The water temperature affects rate of oxygen consumption in Leptobotia elongata, it increases gradually with water temperature rising at 13 - 30℃. Changes of oxygen consumption rate are bigger at the ranges of low temperature (13 - 23℃) and high temperature (28 - 30℃), but amount of increase in oxygen consumption rate and metabolism is relatively lower under water temperature 23 - 28℃.Daily fluctuation of the oxygen consumption rate was also observed in the experiment. The oxygen consumption rate was the highest at 2: 00 a. m., the lowest at 4:00 p. m. Asphyxiation point of the fish is 0. 94 - 1. 06mg/L when the body weight of the fish is 38 - 59g, 0. 62 -0. 70mg/L when body weight is 250 - 320g.