Theses and Dissertations

Title: Pathology of experimental infection of Aeromonas hydrophila (Chester) Stanier, (Bacteria: Pseudomonadales) in the channel catfish, Ictalurus punctatus (Rafinesque)

Name: Gaines, John Luther, Jr.

Degree: PhD

Chair: Dr. W. A. Rogers

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1972

Pages: 88

Keywords: Pathology,Ictalurus punctatous,Channel catfish,Aeromonas hydrophila,Aeromonas punctata,Aeromonas liquefaciens.


Pathologic changes associated with experimental infection of the channel catfish, Ictalurus punctatus, by the bacterium, Aeromonas hydrophila, are described. The bacterium is also known in the literature as A. punctata or A. liquefaciens. Morbidities and mortalities were 65% for 200 fish injected intraperitoneally with 0.1 ml of sterile saline containing 2.5 x 105 organisms. Necrosis of the peritoneal (serous) membrane, underlying connective tissues, and musculature was observed. The muscle surrounding the focus of infection was necrotic. Hemorrhages were found in the adipose tissue underlying the epithelium of the skin. The liver was dark red and appeared congested. Necrotic epithelial cells and pancreatic-like cells were present in the liver. The spleen was swollen and deep red in color with brownish areas. There was extensive necrosis and hemorrhage of the red pulp of the spleen with an apparent increase of the lymphoid cells. There was an apparent increase of the lymphoid cells in the anterior kidney. The posterior kidney was filled with blood and extremely friable. There was an increase in the number of lymphoid cells of the interstitial tissue surrounding Bowman's capsules. Hemorrhages were observed in the interstitial tissues of the hind kidney. Large numbers of deeply basophilic small round cells were present in the basal aspect of the optic lobes of the mesencephalon of the brain in several infected fish. Gill lamellae appeared edematous. The heart and intestine of the infected fish appeared histologically normal.

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