期刊
FISH PHYSIOLOGY AND BIOCHEMISTRY
卷 37, 期 4, 页码 1005-1019出版社
SPRINGER
DOI: 10.1007/s10695-011-9504-1
关键词
Dietary protein; Heat shock; Labeo rohita; Serum cortisol; Stress
资金
- Central Institute of Fisheries Education
The amelioration effect of high dietary protein against stress was evaluated in Labeo rohita fingerlings, exposed to heat shock. Two hundred and forty fingerlings (6.57 +/- A 0.04 g, average weight +/- A SE) were randomly distributed into 4 treatment groups, each with 4 replicates was fed with either of four diets containing different levels of protein (20, 30, 40 or 45%). Water temperatures of all the treatments were within the range of 25.5-26.5A degrees C throughout the experimental period of 30 days. After 30 days of feeding, fish were given heat shock by exposing to 38A degrees C for 2 h. Heat shock significantly decreased (P < 0.05) liver glycogen content in treatment groups fed with 20 and 30% dietary protein, whereas unaffected in the 40 and 45% protein-fed groups. Heat shock significantly increased (P < 0.05) serum glucose and cortisol level in all the treatments. The 40 and 45% dietary protein-fed groups registered significantly higher survival (%) after the heat shock compared with their lower-protein counterparts. Heat shock increased the glycolytic, gluconeogenic, protein metabolic and antioxidative enzymes to cope up with thermal stress. Our results indicate that high-protein diet (a parts per thousand yen40%) combats the stress due to heat shock in Labeo rohita.
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