Abstract
The mode of association of epithelium-associated bacteria in the gastrointestinal (GI) tract of two Indian air-breathing fish species, the murrel, Channa punctatus and the stinging catfish, Heteropneustes fossilis was demonstrated through scanning and transmission electron microscopy (SEM and TEM). The SEM examination revealed substantial numbers of rod shaped bacterial cells associated with the microvillus brush borders of enterocytes in proximal (PI) and distal regions (DI) of the GI tract of both the fish species. The TEM investigation indicated endocytosis and translocation of bacteria in the microvilli. The isolated bacterial strains (two each from the PI and DI of murrel and stinging catfish) were quantitatively evaluated for their extracellular amylase, cellulase and protease production. All the bacterial strains exhibited high cellulolytic activity than that of amylolytic and proteolytic enzymes. Only two strains, CPF1 and CPF2, isolated from the PI of murrel exhibited high proteolytic activity. Maximum amylase activity was exhibited by the strain, HFH5, isolated from the DI of stinging catfish. Totally six most promising enzyme-producing autochthonous bacterial strains were identified based on partial 16S rRNA gene sequence analytical results. All the strains showed close (92–99 %) similarity to Bacillus licheniformis.
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We are grateful to the University Grants Commission (UGC), New Delhi for financial support. Sincere thanks art due to the Head, Department of Zoology, Visva-Bharati University for providing laboratory facilities. Thanks are due to the USIC, University of Burdwan and SAIF, NEHU, Shillong for providing SEM and TEM facilities and technical support.
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Banerjee, G., Nandi, A., Dan, S.K. et al. Mode of Association, Enzyme Producing Ability and Identification of Autochthonous Bacteria in the Gastrointestinal Tract of Two Indian Air-Breathing Fish, Murrel (Channa punctatus) and Stinging Catfish (Heteropneustes fossilis). Proc Zool Soc 70, 132–140 (2017). https://doi.org/10.1007/s12595-016-0167-x
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DOI: https://doi.org/10.1007/s12595-016-0167-x