温度和摄食率对鲈鲤幼鱼摄食代谢特征的影响  

Effects of temperature and feeding rate on postprandial metabolic response in juvenile Percocypris pingi

作　　者：蒲德永[1] 丁雨箫 刘小红[1] 蒲应媚 辜浩然 何兴恒 吴毅 王志坚[1] PU Deyong;DING Yuxiao;LIU Xiaohong;PU Yingmei;GU Haoran;HE Xingheng;WU Yi;WANG Zhijian(Key Laboratory of Freshwater Fish Reproduction and Development,Education of Ministry,Key Laboratory of Aquatic Science of Chongqing,Southwest University,Chongqing 400715,China;Sichuan Lubei Biotechnology Co.,Ltd.,Heima Rare Fish Breeding and Releasing Station,Chengdu 610065,China)

机构地区：[1]西南大学淡水鱼类资源与生殖发育教育部重点实验室,水产科学重庆市重点实验室,重庆400715 [2]四川律贝生物科技有限公司,黑马珍稀鱼类放流站,四川成都610065

出　　处：《水产学报》2021年第10期1634-1641,共8页Journal of Fisheries of China

基　　金：长江渔业资源与环境调查(CJDC-2017-12);西南大学博士启动基金(SWU119006)。

摘　　要：为了研究不同温度和摄食率对鲈鲤幼鱼摄食代谢特征的影响,在15和25℃条件下驯化4周后,以泥鳅块为饵料,按不同的摄食率(15℃下摄食率为1%、2%和4%体质量,25℃下摄食率为1%、2%、4%和6%体质量)投喂实验鱼[体质量(38.35±0.49)g,体长(14.22±0.10)cm],随后测定其耗氧率并计算其摄食代谢相关参数。结果显示,在相同的摄食率下,25℃驯化组静止代谢率、摄食代谢峰值、特殊动力作用(SDA)总耗能和SDA系数都显著高于15℃驯化组;25℃驯化组在2%和4%摄食率下的SDA时间显著小于15℃驯化组。在25℃驯化组中,4%摄食率组的代谢峰值、峰值比率、SDA时间和SDA总耗能都显著高于1%和2%摄食率组,但是显著低于6%摄食率组,4%和6%摄食率组的峰值时间显著高于1%和2%摄食率组,2%、4%和6%摄食率组的SDA系数显著低于1%摄食率组;在15℃驯化组中,4%摄食率组代谢峰值、峰值比率、SDA时间和SDA总耗能都显著高于1%和2%摄食率组,各个摄食率组的峰值时间和SDA系数没有显著性差异。研究表明,相比于低温条件,25℃水温条件可能更有利于鲈鲤幼鱼对食物的快速消化和吸收;随着摄食率的增加,鲈鲤幼鱼通过代谢峰值的增加和SDA时间的延长来满足其SDA耗能增加的需求。本研究结果为鲈鲤的养殖实践和物种保护提供了重要的参考依据。The marked increase in the metabolic rate that occurs following feeding is commonly referred to as specific dynamic action(SDA).Previous studies on SDA in animals have found that the meal type,temperature,body size,feeding frequency,fasting and feeding rate all have significant effects on SDA.The study of postprandial metabolic response in Percocypris pingi has not been reported.To investigate the effects of temperature and feeding rate on postprandial metabolic traits in juvenile P.pingi,the experimental fish[body weight:(38.35±0.49)g,body length:(14.22±0.10)cm]were fed with loach(Misgurnus anguillicaudatus)(feeding rates:1%,2%,4%body mass at 15℃;1%,2%,4%and 6%body mass at 25℃)for 4 weeks as diet acclimation at 15℃ and 25℃ in indoor recirculating aquaculture systems.After that,the oxygen consumption rate was detected and parameters related to postprandial metabolic response were calculated.Results showed that at the same feeding rate,resting metabolic rate,peak metabolic rate,total energy expenditure on SDA and SDA coefficient of 25℃ acclimation group were significantly higher than those of 15℃ acclimation group.The SDA duration of 25℃ acclimation group at 2%and 4%feeding rate was significantly shorter than that of 15℃ acclimation group.At the 25℃,fish of higher feeding rates(4%and 6%)presented significantly higher peak metabolic rate,factorial metabolic scope,SDA duration and total energy expenditure on SDA than those of lower feeding rates(1%and 2%)at 25℃,and times to peak metabolic rate of 4%and 6%feeding rates were significantly earlier than that of 1%and 2%feeding rates as well.However,the SDA coefficient showed an opposite situation:higher feeding rate presented significantly lower values.At the 15℃,peak metabolic rate,factorial metabolic scope,SDA duration and energy expended on SDA of 4%feeding rate group were significantly higher than those of 1%and 2%feeding rates.Nevertheless,no significant difference in the time to peak metabolic rate and the SDA coefficient among all feeding

关 键 词：鲈鲤 温度 摄食率 特殊动力作用 

分 类 号：S963[农业科学—水产养殖]