title: [Study on Oxygen Consumption, Oxygen Consumption Rate and Asphyxiation Point of Poecilobdella manillensis].
abstract: OBJECTIVE
  To investigate the oxygen consumption, oxygen consumption rate and asphyxiation point of Poecilobdella ma- nillensis.
  
  
  METHODS
  Oxygen consumption, oxygen consumption rate and asphyxiation point on juvenile (the average weight of 0. 29 g) and adult leech (the average weight of 2.89 g) of Poecilobdella manillensis were measured at water temperature conditions of 20. 2 and 30. 4 °C respectively using an airtight container with flowing water.
  
  
  RESULTS
  Oxygen consumptions of Poecilobdella manillensis were increased with the increase of temperature and body weight respectively; However, their oxygen consumption rates circadian variation and the aver- age oxygen consumption rate at daytime were higher than those at night. In addition, their asphyxiation point was declined accordingly with the increase of temperature and body weight respectively.
  
  
  CONCLUSIONS
  Oxygen consumption and oxygen consumption rate of Poeci- lobdella manillensis were closely associated with their activities and influenced by circadian variation, the preferable feeding time were the period of 6:00-10:00 in the morning or 17:00-19:00 in the afternoon; Meanwhile, Poecilobdella manillensis had a higher ability of the hypoxia tolerance for high density or factory farming, the long time living preservation and the long distance transport.
authors.forename: Wei-guan
authors.initials: WG
authors.lastname: Zhou
authors.forename: Wei-ping
authors.initials: WP
authors.lastname: Lv
authors.forename: Yi
authors.initials: Y
authors.lastname: Qiu
authors.forename: Wei-hai
authors.initials: WH
authors.lastname: Zhou
mesh_terms: D000818:Animals; D007865:Leeches / Q000502:physiology*; D010101:Oxygen Consumption; D013696:Temperature; D014867:Water
chemical_list: D014867:Water