scholarly journals Intra-ovum Infection in Salmonid Eggs Artificially Contaminated with Fish Pathogenic Bacteria: Flavobacterium psychrophilum, Renibacterium salmoninarum and Aeromonas salmonicida

2012 ◽  
Vol 47 (2) ◽  
pp. 49-55 ◽  
Author(s):  
Masakazu Kohara ◽  
Hisae Kasai ◽  
Mamoru Yoshimizu
Keyword(s):  
Pathogenic Bacteria ◽  
Aeromonas Salmonicida ◽  
Renibacterium Salmoninarum ◽  
Flavobacterium Psychrophilum ◽  
Salmonid Eggs

scholarly journals Load of Aeromonas salmonicida in Swamp Water and its Pathogenicity to Koi, Anabas testudineus (Bloch)

1970 ◽  
Vol 15 ◽  
pp. 181-184 ◽  
Author(s):  
Rowshatul Afza ◽  
M Afzal Hussain ◽  
Habiba Khatun ◽  
Sabina Yeasmin ◽  
Md Iqbal Hossain ◽  
...  
Keyword(s):  
Pathogenic Bacteria ◽  
Bacterial Load ◽  
Aeromonas Salmonicida ◽  
Fish Production ◽  
Artificial Infection ◽  
Anabas Testudineus ◽  
Tropical Zone ◽  
Aeromonas Sobria ◽  
Causative Agents ◽  
Zone Temperature

Among the fishery resources, swamps are very important for various fish species such as Oreochromis nilotica, Oreochromis mossambica, Anabas testudineus, Channa punctatus and Heteropneustes fossilis. Swamps require shorter time and small investment for fish culture (Rahman et al. 1998). However, diseases are major problems in fish production both in culture system and wild condition in Bangladesh (Rahman and Chowdhury 1996). Bacteria, especially Aeromonas sp. is one of the causative agents of fish diseases. Bangladesh is situated in the tropical zone. Temperature is one of the important factors which affect the growth of pathogenic bacteria (Ljungh and Wadstrom 1982). Aeromonas sobria increases and grows at 17- 25°C (Rahman and Chowdhury 1996). Aeromonas sp. is the causative agent of various kinds of ulcerative disease of fishes (Karunasagar and Sugumar 1995). Yesmin et al. (2004) and Chowdhury and Baqui (1997) reported that Aeromonas is a very common pathogen in carps and live fishes. Hossain et al. (2006) worked on the bacterial load, Pseudomonas aeruginosa and their artificial infection to Oreochromis niloticus. The present study was undertaken to investigate the bacterial load in swamp water and the pathogenicity of A. sobria in A. testudineus.   doi: 10.3329/jbs.v15i0.2162 J. bio-sci. 15: 181-184, 2007

scholarly journals Comparative Genomic Analyses of Flavobacterium psychrophilum Isolates Reveals New Putative Genetic Determinants of Virulence Traits

2021 ◽  
Vol 9 (8) ◽  
pp. 1658
Author(s):  
Daniel Castillo ◽  
Valentina L. Donati ◽  
Jóhanna Jørgensen ◽  
Krister Sundell ◽  
Inger Dalsgaard ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Pathogenic Bacteria ◽  
Gliding Motility ◽  
Comparative Genomic ◽  
Virulence Determinants ◽  
Entire Genome ◽  
Flavobacterium Psychrophilum ◽  
Virulence Traits ◽  
Or Gene ◽  
The Baltic

The fish pathogen Flavobacterium psychrophilum is currently one of the main pathogenic bacteria hampering the productivity of salmonid farming worldwide. Although putative virulence determinants have been identified, the genetic basis for variation in virulence of F. psychrophilum is not fully understood. In this study, we analyzed whole-genome sequences of a collection of 25 F. psychrophilum isolates from Baltic Sea countries and compared genomic information with a previous determination of their virulence in juvenile rainbow trout. The results revealed a conserved population of F. psychrophilum that were consistently present across the Baltic Sea countries, with no clear association between genomic repertoire, phylogenomic, or gene distribution and virulence traits. However, analysis of the entire genome of four F. psychrophilum isolates by hybrid assembly provided an unprecedented resolution for discriminating even highly related isolates. The results showed that isolates with different virulence phenotypes harbored genetic variances on a number of consecutive leucine-rich repeat (LRR) proteins, repetitive motifs in gliding motility-associated protein, and the insertion of transposable elements into intergenic and genic regions. Thus, these findings provide novel insights into the genetic variation of these elements and their putative role in the modulation of F. psychrophilum virulence.

Sign in / Sign up

Export Citation Format

Share Document