Effect of temperature stress on the survival of juvenile Chinese mitten crab (Eriocheir sinensis)

Eriocheir sinensis, which is an important aquaculture species, belongs to the class Crustacea. To discuss the temperature tolerance of E. sinensis, the survival rates of juvenile crabs of E. sinensis were determined in this paper using a series of temperature settings (normal temperature, ۲۵°C, ۳۰°C, ۳۲°C, ۳۴°C, ۳۵°C, ۳۶°C, ۳۸°C, ۴۰ °C). The results indicated that except the normal temperature level, mortality rate almost reached ۱۰۰% at other temperatures. The time of death of all crabs at ۳۰℃, ۳۵℃, and ۴۰℃ was different. All the crabs died in only ۱۰ minutes at ۴۰℃, while they died after ۳ days and ۷ days at ۳۵ ℃ and ۳۰℃, respectively. In addition to normal temperature conditions, minimum survival time of the juvenile crabs of E. sinensis at other temperature condition was no more than ۲۴ h. Before the ۸th day, the death rate at ۳۰℃ and normal temperature was different, change of turning slope for concentration of NH۳-N and TN was contrary. Under normal temperature, the behavior of abdomen extension was not observed in juvenile crabs but the percentage time of abdomen extension was relatively long at ۲۵℃. This research studied the influence of temperature stress on the survival of juvenile crabs of E. sinensis to provide information reference for the production and transportation of juvenile crab of E. sinensis.

Keywords:

Eriocheir sinensis , Temperature stress , Survival , Behavior responsed