Tolerance on High Water Temperature of Hybrid Abalone (Haliotis discus hannai♀＊H. discus discus♂)

Analysis of the physiological responses of Pacific abalone (Haliotis discus hannai) to various stressors to identify a suitable stress indicator

“…In this study, all treatment groups showed rapid increases in glucose levels immediately after treatment, followed by a gradual decrease during the recovery period, which confirmed that glucose metabolism is immediately activated by a rapidly changing stressful environment. Kim et al (2005) reported that a water temperature of 10 C has no effect on mortality in abalone; however, the low water temperature treatment in this study was 4 C, which appeared to induce stress in the tested H. discus hannai. In this study, glucose levels increased immediately after treatment in all experimental groups, and decreased during the recovery period; this was consistent with the findings of previous studies.…”

“…The abalones exhibited physiological adaptability to low water temperatures, with detachment and survival rates of 0% and 96.7% in that treatment group. Several studies have demonstrated that stress alters disease resistance and survival in abalone (Kim et al, 2005; Kim et al, 2006; Wells & Baldwin, 1995). Kim et al (2005) suggested that H. discus hannai juveniles survived all but 30°C experimental group, which showed a survival rate of 92% in acute temperature treatment.…”

“…Several studies have demonstrated that stress alters disease resistance and survival in abalone (Kim et al, 2005; Kim et al, 2006; Wells & Baldwin, 1995). Kim et al (2005) suggested that H. discus hannai juveniles survived all but 30°C experimental group, which showed a survival rate of 92% in acute temperature treatment. However, it seems that the survival rate was high through adaptation to high temperature in the 2 months acclimatization at a water temperature of 20°C, unlikely the acclimatization at 12°C in our study.…”

“…Free radicals are naturally produced through oxygen metabolism, and their concentrations can increase dramatically because of environmental stress (Kim et al, 2005). Proliferation of free radicals can impair cell function and structure (Ferraris et al, 2002).…”

“…These losses are continually increasing because of the higher water temperatures associated with global warming. Therefore, the impacts of environmental stresses such as water temperature (Kim et al, 2005(Kim et al, , 2006 and salinity (Cheng et al, 2002;Yang et al, 2008) on H. discus hannai require further study. Currently, the physiological responses of H. discus hannai to various stressors remain poorly understood.…”