有氧运动训练对中华倒刺鲃幼鱼肠道排空及其数学模型选择的影响

THE EFFECTS OF AEROBIC EXERCISE ON GUT EVACUATION OF JUVENILE QINGBO(SPINIBARBUS SINENSIS) AND THE ASSOCIATED MATHEMATICAL MODELS

为了考察有氧运动训练对中华倒刺鲃幼鱼肠道排空及其数学模型选择产生的影响,在(25±0.5)℃条件下,将108尾大小相当的实验鱼[(24.47±0.03)g,(10.90±0.02)cm]随机分为对照组(CG),1 BL/s训练组(1TG)和2 BL/s训练组(2TG),在相应流速下运动训练8w后,轻度麻醉灌喂体重1.45%的饵料,随后在不同时间点分别测定肠道内容物重量及其百分比,用3个常见数学模型对实验数据进行拟合并比较。结果发现,1TG和2TG训练组的体重特定生长率(WSGR)显著高于CG对照组(P<0.05);各实验组肠道内容物干重及其百分比随着摄食后时间的延长而显著降低;所有实验组肠道排空的最优数学模型均为平方根模型;训练组(1TG和2TG)的肠道排空率(皆为0.49%/h)明显大于CG对照组(0.41%/h)(P<0.05),1TG和2TG训练组的肠道排空时间(分别为20.39h和20.33h)短于CG对照组(24.51h)。研究表明,有氧运动训练没有对中华倒刺鲃幼鱼的肠道排空特征及其最优数学模型选择产生显著影响,但明显提高了该种鱼的肠道排空率并缩短其肠道排空时间。

Here we investigated the effects of aerobic exercise on gut evacuation and the associated mathematical mo- dels of juvenile qingbo （Spinibarbus sinensis）. One hundred and eight fish [（24.47±0.03） g, （10.90±0.02） cm]were sub- jected to aerobic exercise at water velocities of control （3cm/s, CG）, 1 body length/s （1BL/s, 1TG）, and 2 BL/s （2TG） at （25±0.5）℃ for 8 weeks. All fish from the control group （CG） and exercise groups （1TG and 2TG） were lightly anaes- thetized and compulsively fed with compound diet （1.45% of the body weight）. Then we collected and analyzed the wet mass of intestinal content at different time. The percentages （dry mass of residual diet/dry mass of total diet） of the re- sidual diet in the intestine were also calculated and fitted with three common mathematical equations （linear, exponen- tial and square-root）. The results indicated that the aerobic exercise training induced a significant increase in the weight specific growth rate （WSGR） compared to CG （P〈0.05）. In both CG and the training groups, the dry mass of the intesti- nal content and the percentages of the residual diet decreased significantly over time after feeding. We determined that the square-root model best described the gut evacuation among all three mathematical models. The intestinal evacuation rate of CG （0.41%/h） was much lower than that of 1TG and 2TG （both 0.48%/h）, and the intestinal evacuation time of the 1TG （20.39h） and 2TG （20.33h） was much shorter than that of the CG （24.5 1h）. These results suggested that aerobic exercise could not change the intestinal evacuation and the associated mathematical model, but might significantly in- crease the intestinal evacuation rate and shorten the evacuation time.