Influence of Elevated Temperatures on the Physiological Response of Hemolymph from Two Species of the Abalone, Haliotis discus hannai and H. discus discus
Eun-Young Min, Jung Sick Lee, Jae Won Kim, Mi Ae Jeon and Ju-Chan Kang
Institute of Fisheries Science, Pukyong National University, Busan 608-737, Korea Department of Aqualife Medicine, Chonnam National University, Yeosu 550-749, Korea Department of Marine Life-Science, Gangwon Provincial College, Gangneung 210-804, Korea

This study was conducted to investigate the effects of elevated water temperature (WT) on biochemical and immunological factors in the hemolymph of the abalones, Haliotis discus hannai and H. discus discus. The abalone were exposed to various WT; 20, 22, 24, 26 and 28 for 4 days. In the control and 20, total-protein (TP), glucose and calcium (Ca) in hemolymph of H. discus discus were higher than the values in H. discus hannai. The values of magnesium (Mg), alkaline phosphatase (ALP) and lysozyme in H. discus hannai were similar to the H. discus discus in the control. There were no significant alterations in TP, glucose and Mg levels of hemolymph in H. discus hannai and H. discus discus by WT increases. The values of Ca, ALP and lysozyme were increased in H. discus hannai exposed to the high temperature (26 and 28) compared to control, while the values in H. discus discus were not significant difference between the WT groups. The phenoloxidase (PO) activity was increased in hemolymph of H. discus hannai exposed to high temperature ( 24) compared to the control (P < 0.05). These physiological and immunological parameters were significantly changed in H. discus hannai. However, these parameters in H. discus discus were barely altered at the high WT (P < 0.05). These results suggested that H. discus hannai is considered to be more sensitive than H. discus discus at the high WT.

  
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