Comparisons of physiological and biochemical responses between milkfish (Chanos chanos) and grass carp (Ctenopharyngodon idella) to cold shock |
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| Institution: | 1. Department of Marine Life Sciences, Jeju National University, Jeju 690-756, South Korea;2. Research & Development Aqua Platform, AQUATIV Corporation, ZA du Gohelis, Elven 56250, France;3. Marine and Environmental Research Institute, Jeju National University, Jeju 695-814, South Korea;1. Division of Marine Environment and BioScience, College of Ocean Science and Technology, Korea Maritime and Ocean University, Busan 606-791, Republic of Korea;2. Department of Marine Bio-Materials and Aquaculture, Pukyong National University, Busan 608-739, Republic of Korea;1. Department of Biological Sciences, University of Manitoba, Winnipeg, MB, Canada;2. Department of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada |
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| Abstract: | Temporal changes in physiological parameters and enzyme activities related to carbohydrate metabolism in the milkfish (Chanos chanos) and the grass carp (Ctenopharyngodon idella) under cold shock at 15 °C were examined in order to better understand thermal compensation mechanisms of teleosts with different cold tolerances. The plasma glucose, lactate, and lipid contents as well as enzyme activities of citrate synthase, glucose-6-phosphate dehydrogenase, fructose-1,6-bisphosphatase, phosphorylase a, and lactate dehydrogenase at varying time intervals were monitored. The results show that changes in plasma glucose and lipid contents of the milkfish were more notable than those of the grass carp, but the elevation in plasma lactate contents in the grass carp occurred earlier and was much greater than that in the milkfish. Furthermore, changes in plasma glucose contents in the milkfish were correlated with the enzyme activities of phosphorylase a and fructose-1,6-bisphosphatase, but in the grass carp they were correlated with glucose-6-phosphate dehydrogenase and lactate dehydrogenase activities instead. In addition, the change in lactate dehydrogenase activity in the grass carp was more notable than those of other enzymes, but lactate dehydrogenase activities in the milkfish steadily decreased during cold compensation. The results demonstrate that the two species (milkfish and grass carp) respond quite differently to cold shock, and this may be related to their differences in cold tolerance. |
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