alexa Effect of Dietary Supplementation of Bacillus subtilis
ISSN: 2155-9899

Journal of Clinical & Cellular Immunology
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Research Article

Effect of Dietary Supplementation of Bacillus subtilis and Terribacillus saccharophillus on Innate Immune Responses of a Tropical Freshwater Fish, Labeo rohita

Kalarani V1*, Sumathi V1, Roshan Jahan K1, Sowjanya D1 and Reddy DC2
1Department of Biotechnology, Sri Padmavati Mahila Visvavidyalayam (Women’s University), Tirupati, A.P., India
2UGC–Emeritus Fellow, Department of Fishery Science and Aquaculture, Sri Venkateswara University, Tirupati, A.P., India
*Corresponding Author : Dr. V. Kalarani
Professor in Biotechnology, Dept. of Biotechnology
S.P. Mahila Visvavidyalayam (Women’s University), Tirupati, A.P., India
Tel: 09704271015
Email: [email protected]
Received: January 07, 2016 Accepted: February 24, 2016 Published: February 29, 2016
Citation: Kalarani V, Sumathi V, Roshan JK, Sowjanya D, Reddy DC (2016) Effect of Dietary Supplementation of Bacillus subtilis and Terribacillus saccharophillus on Innate Immune Responses of a Tropical Freshwater Fish, Labeo rohita. J Clin Cell Immunol 7:395. doi: 10.4172/2155-9899.1000395
Copyright: © 2016 Kalarani V, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Objective: Indiscriminate use of antibiotics to control fish diseases has led to the development and propagation of antibiotic resistant bacteria in aquatic ecosystems. Amongst the various alternatives proposed, enhancing immunity in fish using probiotics is the most widely accepted approach. Several earlier studies indicated the possibility of more potent effects of bacteria on fish when administered in live condition than as inactivated cells. But very few studies have explored the effect of gut bacteria on innate immune responses of fishes. Hence an attempt is made to study immunostimulatory effects of dietary supplementation of Bacillus subtilis and Terribacillus saccharophillus isolated from the gut of an edible Indian freshwater fish, Labeo rohita, in the same species.

Methods: Long term administration (for 30 and 60 days) of B. subtilis or T. saccharophillus isolated from the gut wall of L. rohita were tested in the same species for their ability to improve innate immunity through measurement of the phagocytic activity, respiratory burst, myeloperoxidase activity, serum IgM levels, serum lectins, haemagglutination and haemolytic activity.

Results: Dietary administration of 107 cfu/g of B.subtilis/T. saccharophillus for 30 (B1) or 60 (B2) days resulted in a significant increase in immune and humoral responses of L. rohita. Serum phagocytic activity, respiratory burst activity, myeloperoxidase activity, serum lectins, haemagglutination and haemolytic activity increased upon administration of B.subtilis / T. saccharophillus, except serum IgM levels which increased only in B1. A positive correlation was observed between the duration of supplementation of diets and the responses in both the cases.

Conclusion: The results suggest that T. saccharophillus can also be used as a potent probiont similar to B.subtilis and both will have significant applications in fish feed formulations and disease prevention.


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