Effects of a probiotic bacterial Lactobacillus rhamnosus dietary supplement on the crowding stress response of juvenile Nile tilapia Oreochromis niloticus

被引:0
作者
Ana Teresa Gonçalves
Masashi Maita
Kunihiko Futami
Masato Endo
Takayuki Katagiri
机构
[1] Tokyo University of Marine Science and Technology,Graduate School of Marine Science and Technology
[2] Tokyo University of Marine Science and Technology,Department of Marine Biosciences
来源
Fisheries Science | 2011年 / 77卷
关键词
Crowding stress; Probiotic; Stress response; Fish; Stress management;
D O I
暂无
中图分类号
学科分类号
摘要
To test the effects of probiotic bacteria against crowding stress, juvenile Nile tilapia Oreochromis niloticus were fed commercial feed supplemented with 1 × 1010 cfu/g pellets of Lactobacillus rhamnosus for 3 weeks. The fish were confined and subjected to crowding for 7 and 14 days after which their physiological condition was investigated. The administration of probiotic prophylaxis improved growth performance even in the stressed fish. After 7 days of stress exposure, fish receiving probiotic-supplemented feed showed proactive behavior and coping responses to the stressor, as evidenced by elevated plasma glucose levels and osmolality, stabilized plasma electrolytes, and a higher RNA:DNA ratio. Fish stressed for 7 days and fed normal commercial diet showed impairment of plasma electrolytes; after 14 days, the plasma osmolality, electrolytes, glucose, and RNA:DNA ratio decreased, indicating physiological maladaptation to the stressor. The growth rate was also found to be reduced, suggesting that energy demand exceeded the energy available from metabolism and dietary uptake. This latter effect was not observed in fish fed the probiotic-supplemented diet. The results suggest that probiotic bacteria prophylaxis may increase energy availability for metabolic support of the crowding stress response and improve the stress coping capacity of fish.
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页码:633 / 642
页数:9
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