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KMID : 0894520150190010019
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Development & Reproduction
2015 Volume.19 No. 1 p.19 ~ p.24
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Effects of Water Temperature Change on the Hematological Responses and Plasma Cortisol Levels in Growing of Red Spotted Grouper, Epinephelus akaara
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Cho Hyun-Chul
Kim Ji-Eun
Baek Hea-Ja
Kim Hyung-Bae
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Abstract
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This study was conducted to determine the stress response [ethological (operculum movement number (OMN)), hematological (hematocrit and hemoglobin), biochemical (glucose, cortisol and glutamic oxaloacetic transaminase (GOT))] in red spotted grouper, Epinephelus akaara during exposure of different water temperature in winter season. This species (Total length, 18.56±0.34cm ) previously maintained in water temperature of 15°C were transferred to 15, 20 and 25°C . During experimental period (7 days), OMN, hematocrit (Ht), glucose and GOT values were significantly high in 15°C when compared to 20 and 25°C . Hemoglobin value was also increased at 15°C , but no significant differences. There was no differences in cortisol levels among the temperature groups. No fish mortality was observed during the experimental period. From these results, 15°C is likely more stressful to red spotted grouper than 20°C and 25°C . These observations confirm that red spotted grouper adapts better to temperatures between 20 and 25°C during the winter season.
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KEYWORD
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Red spotted grouper, Epinephelus akaara, Hematological responses, Cortisol, Glucose
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