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Effects of water temperature on oxygen consumption rate, asphyxiant point, blood glucose content, and muscle and liver glycogen content of juvenile Coilia nasus.

XU Gang-chun1, NIE Zhi-juan1, BO Qi-kang2, XU Pao1, GU Ruo-bo1**   

  1. (1 Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, Jiangshu, China; 2Wuxi College of Fisheries, Nanjing Agriculture University, Wuxi 214081, Jiangshu, China)
  • Online:2012-12-10 Published:2012-12-10

Abstract: In order to supply reference for the rational breeding and transportation of Coilia nasus, a laboratory experiment was conducted to measure the oxygen consumption rate (OCR) and asphyxiation point (AP) of juvenile C. nasus under different water temperature, and to study the diurnal variations of the OCR as well as the effects of water temperature on the blood glucose and muscle and liver glycogen of the juveniles. At water temperature (T, ℃) 16-28 ℃, the OCR (R, mg·L-1) of the juveniles increased with increasing temperature, and there was a linear relationship between the R and T (R=0.988T2-32.36T+343.7, R2=0.96). The OCR revealed a diurnal rhythm, with the peak at 7:00 am and the bottom at 9:00 pm. The AP (A, mg·L-1) was significantly correlated to T (A=0.9397T0.8001, R2=0.98). At water temperature 16-24 ℃, the blood glucose content of the juveniles kept relatively steady and ranged from 17.24 to 19.79 mmol·L-1,  while the muscle and liver glycogen content fluctuated. At water temperature 24-28 ℃, the blood glucose content increased significantly with increasing temperature, while the muscle and liver glycogen content had a significant decrease.