NDLI: Live microbial feed supplement in aquaculture for improvement of stress tolerance

Content Provider	Springer Nature Link
Author	Rollo, A. Sulpizio, R. Nardi, M. Silvi, S. Orpianesi, C. Caggia, M. Cresci, A. Carnevali, O.
Copyright Year	2006
Abstract	Two bacterial strains, Lactobacillus fructivorans, isolated from sea bream (Sparus aurata) gut, and Lactobacillus plantarum, isolated from human faeces, were administered simultaneously, during sea bream development, using Brachionus plicatilis and/or Artemia salina as vectors. The probiotic treatment significantly affected gut colonization. To test the probiotic influence on stress responsiveness, sea bream fry, 47 days post-hatching (p.h.), were subjected to pH stress (from 8.6 to 6.3) and cumulative mortality, cortisol levels and HSP70 gene expression were analysed. Cortisol was selected, since under stress conditions its level increases. HSP70 was selected with consideration of its wide involvement in response to a great number of injuries, and because it protects cells probably by binding and refolding damaged proteins. The results obtained indicated that the administration of probiotic to sea bream fry induced higher HSP70 levels, indicating a greater potentiality to respond to the harmful conditions possibly present in fish farms. This hypothesis is supported by the fact that the levels of cortisol found were significantly lower (P < 0.05) in both groups under probiotic treatment. When pH was used as a stressor, it induced a higher cumulative mortality in the control; the mortality was found to be significantly lower in both treated groups. Interestingly, a significant increase (P < 0.05) in HSP70 gene expression was observed in all stressed groups. These results suggest an improvement in tolerance to acute stress of fry fed with probiotics.
Starting Page	167
Ending Page	177
Page Count	11
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	32
Issue Number	2
e-ISSN	15735168
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-07-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cortisol Fish diet HSP70 Lactobacillus Mortality Sea bream Animal Physiology Animal Anatomy / Morphology / Histology Zoology Hydrobiology Animal Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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