SOME VARIETIES OF PATHOLOGICAL CHANGES IN EXPERIMENTAL INFECTION OF CARPS (Cyprinus carpio) WITH Aeromonas hydrophila

Abstract

Abstract:The main clinical and pathomorphological changes in Aeromonas hydrophila infection in carp provoked by different field strains of this bacterium were studied. The strongest histopathological damages were seen in the functional epithelium of liver and kidneys, followed by intestine and hearth damages in addition to various haemorrhages in interstitial tissues of visceral organs and some skin haemorrhages on the ventral surface of the body and the anal region. As a whole, pathological damages consisted of degenerative changes as cloudy swelling, granular and/or hyaline droplet degeneration or vacuolation in functional epithelium in the respective internal organs in addition to some target vascular disturbances, which appeared to be good biomarkers for field assessment of that disease. Pathological damages in internal organs and haemorrhages were stronger in experimental fishes exposed to higher levels of the respective pathogens, especially those isolated from dead anaconda or the referent strain, and less pronounced damages were seen in fishes infected with of Aeromonas hydrophila isolated from a silver carp with marked signs of septicaemia. Keywords

Histopathological studies of experimental Aeromonas hydrophila infection in blue tilapia, Oreochromis aureus

“…Our findings were much similar to the symptoms found in other fish species (Abdelhamed et al, 2017, Alsaphar and Al-Faragi, 2012, Cipriano et al, 1984, Khamees et al, 2013, Kumar et al, 2016, Stratev et al, 2015). Many studies showed that the chronic infections of A .…”

“…It can cause local pathology to the host tissue. The host’s reaction may be in the form of tissue proliferation, degeneration and inflammation (Stratev et al, 2015). A. hydrophila can be a pathogenic agent not only for fish, amphibians and reptiles, but also for mammals, including humans (Aoki, 1999, Janda and Abbott, 2010, Lallier and Higgins, 1988, Plumb and Hanson, 2011, Stratev et al, 2015, Trott, 2006).…”

“…The host’s reaction may be in the form of tissue proliferation, degeneration and inflammation (Stratev et al, 2015). A. hydrophila can be a pathogenic agent not only for fish, amphibians and reptiles, but also for mammals, including humans (Aoki, 1999, Janda and Abbott, 2010, Lallier and Higgins, 1988, Plumb and Hanson, 2011, Stratev et al, 2015, Trott, 2006). A. hydrophila can be isolated from estuarine waters, marine, brackish and freshwaters (Aoki, 1999, Dias et al, 2016, Janda and Abbott, 2010, Lallier and Higgins, 1988, Trott, 2006).…”

Natural co‐infection of cultured Nile tilapiaOreochromis niloticuswithAeromonas hydrophilaandGyrodactylus cichlidarumexperiencing high mortality during summer

“…These pigmented cells may appear isolated or in the form of a cluster where it indicates the positive presence of neutral carbohydrate and melanin (Agius & Roberts, ). Our results were much like the findings found in other fish species in previous investigations (Abdelhamed, Ibrahim, Baumgartner, Lawrence, & Karsi, ; Brenden & Huizinga, ; Cipriano, Bullock, & Pyle, ; Kumar et al, ; Stratev, Stoev, Vashin, & Daskalov, ).…”

“…Moreover, various haemorrhagic patches were found in the interstitial tissue of the visceral organs, anal region and on the ventral surface of the body. It has been proposed that several virulence factors derived from A. hydrophila contribute significantly to the discussion of the pathogenesis of infection by this organism (Stratev et al, ). Many Aeromonas sp.…”