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Kumar R.,National Bureau of Fish Genetic Resources Cochin Unit | Swaminathan T.R.,National Bureau of Fish Genetic Resources Cochin Unit | Kumar R.G.,National Bureau of Fish Genetic Resources Cochin Unit | Dharmaratnam A.,National Bureau of Fish Genetic Resources Cochin Unit | And 2 more authors.
Acta Tropica | Year: 2015

Moribund koi carp, Cyprinus carpio koi, from a farm with 50% cumulative mortality were sampled with the aim of isolating and detecting the causative agent. Three bacterial species viz., Citrobacter freundii (NSCF-1), Klebsiella pneumoniae (NSKP-1) and Proteus hauseri [genomospecies 3 of Proteus vulgaris Bio group 3] (NSPH-1) were isolated, identified and characterized on the basis of biochemical tests and sequencing of the 16S rDNA gene using universal bacterial primers. Challenge experiments with these isolates using healthy koi carp showed that P. hauseri induced identical clinical and pathological states within 3 d of intramuscular injection. The results suggest P. hauseri (NSPH-1) was the causative agent. In phylogenetic analysis, strain NSPH-1 formed a distinct cluster with other P. hauseri reference strains with ≥99% sequence similarity. P. hauseri isolates were found sensitive to Ampicillin, Cefalexin, Ciprofloxacin and Cefixime and resistant to Gentamycin, Oxytetracycline, Chloramphenicol, and Kanamycin. The affected fish recovered from the infection after ciprofloxacin treatment. © 2015 Elsevier B.V. Source


Balasubramanian C.P.,Central Institute of Brackishwater Aquaculture | Cubelio S.S.,National Bureau of Fish Genetic Resources Cochin Unit | Mohanlal D.L.,Central Institute of Brackishwater Aquaculture | Ponniah A.G.,Central Institute of Brackishwater Aquaculture | And 8 more authors.
Mitochondrial DNA | Year: 2016

For several years, mud crabs of genus Scylla have been misidentified owing to their high morphological plasticity and the absence of distinct morphological diagnostic characters. The taxonomic confusion of genus Scylla de Haan is considered to be a primary constraint to the development of aquaculture. Although genus Scylla was revised using morphological and genetic characteristics, taxonomy of Scylla species occurring in India is still not clear. In this study, partial sequences of two mitochondrial genes, 16S rRNA and CO1 (Cytochrome C oxidase subunit I) in populations of Scylla spp. obtained from eleven locations along the Indian coast were used to differentiate and resolve taxonomical ambiguity of the mud crab species in India. The sequences were compared with previously published sequences of Scylla spp. Both trees generated based on 16S rRNA and CO1 indicated that all S. tranquebarica morphotypes obtained during this study and S. tranquebarica sequences submitted previously from Indian waters reciprocally monophyletic with reference sequence of S. serrata. Both sequence data and morphological characters revealed that the species S. serrata (Forskal) is the most abundant followed by S. olivacea. Further, the 16S rRNA and COI haplotypes of Indian S. tranquebarica obtained in the study significantly differed with the known S. tranquebarica by 6.7% and 10.6% respectively whereas it differed with known S. serrata by 0.0-0.7% only, a difference that was not statistically significant. From these studies it is clear that "S. tranquebarica" commonly reported from India should be S. serrata (Forskal). © 2014 Informa UK Ltd. Source


Divya P.R.,National Bureau of Fish Genetic Resources Cochin Unit | Gopalakrishnan A.,Central Marine Fisheries Research Institute | Basheer V.S.,National Bureau of Fish Genetic Resources Cochin Unit | Swaminathan R.,National Bureau of Fish Genetic Resources Cochin Unit | And 5 more authors.
Mitochondrial DNA | Year: 2015

Silver pomfret, Pampus argenteus is an economically important seafood species. The fishery resource of pomfret in Indian waters shows a dwindling catch since the last few years and the pomfrets caught were mostly undersized which calls for immediate attempts for management of resources. An accurate definition of population structure is important for management of this species. The genetic stock structure of P. argenteus distributed along Indian coast was identified using analysis of 842bp of complete ATPase 6/8 genes of mitochondrial DNA. Altogether, 83 silver pomfret (P. argenteus) collected from 4 locations along Indian coast (Gujarat, Kerala, Tamil Nadu and West Bengal) were sequenced. Twenty four haplotypes were identified among 83 individuals with haplotype diversity (0.87) and nucleotide diversity (0.0025). The significant pair-wise FST and AMOVA values, between samples from West Bengal (east coast) and other locations along the west coast (Gujarat and Kerala) indicated the occurrence of distinct population structure in silver pomfret along the coast. © 2014 Informa UK Ltd. Source


Singh K.V.,National Bureau of Fish Genetic Resources | Lakra W.S.,National Bureau of Fish Genetic Resources | Gopalakrishnan A.,National Bureau of Fish Genetic Resources | Gopalakrishnan A.,National Bureau of Fish Genetic Resources Cochin Unit | And 6 more authors.
Indian Journal of Animal Sciences | Year: 2011

Traditionally, fish species identification is based on morphological characters, yet, in many cases it is difficult to establish identity as in the case of seahorses which lack key species-diagnostic morphological features. The spotted or yellow seahorse - Hippocampus kuda has a complex identity and the samples collected from the east and west coasts of India were analyzed for the species identification and phylogenetic relationship, based on partial sequence information of mitochondrial genes - 16S rRNA and Cytochrome Oxidase subunit I (COI). Estimates of genetic divergence with both 16S rRNA and COI genes, when compared with the sequence divergence values of H. kuda from other continents (as obtained from NCBI accessions) were sufficient enough to discriminate individuals of the same species from Indian waters. Pair-wise fST values using AMOVA indicated significant levels of genetic differentiation of H. kuda populations among east coast, Kerala and Konkan populations; however, no significant genetic partitioning was observed between the Palk Bay and Gulf of Mannar populations. Source


Swaminathan T.R.,National Bureau of Fish Genetic Resources Cochin Unit | Basheer V.S.,National Bureau of Fish Genetic Resources Cochin Unit | Gopalakrishnan A.,National Bureau of Fish Genetic Resources Cochin Unit | Gopalakrishnan A.,Central Marine Fisheries Research Institute | And 2 more authors.
Cytotechnology | Year: 2016

A new epithelial cell line, Horabagrus brachysoma fin (HBF), was established from the caudal fin tissue of yellow catfish, H. brachysoma and characterized. This HBF cell line was maintained in Leibovitz’s-15 medium supplemented with 15 % fetal bovine serum (FBS) and subcultured more than 62 times over a period of 20 months. The HBF cell line consists predominantly of epithelial cells and is able to grow at temperatures between 20 and 35 °C with an optimum temperature of 28 °C. The growth rate of these cells increased as the proportion of FBS increased from 5 to 20 % at 28 °C with optimum growth at the concentrations of 15 % FBS. Partial amplification and sequencing of fragments of two mitochondrial genes 16S rRNA and COI confirmed that HBF cell line originated from yellow catfish. The HBF cells showed strong positive reaction to the cytokeratin marker, indicating that it was epithelial in nature. HBF cell line was inoculated with tissue homogenate from juveniles of Sea bass, Lates calcarifer infected with viral nervous necrosis virus (VNNV) and found not susceptible to VNNV. The extracellular products of Vibrio cholerae MTCC 3904 were toxic to the HBF cells. These cells were confirmed for the absence of Mycoplasma sp by PCR. © 2014, Springer Science+Business Media Dordrecht. Source

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