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Diseases of Aquatic Organisms

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DAO 21:171-175 (1995)  -  doi:10.3354/dao021171

Effects of temperature and salt concentration on latent Edwardsiella ictaluri infections in channel catfish

Plumb JA, Shoemaker C

Juvenile channel catfish Ictalurus punctatus, 10% of which had a natural, latent infection of Edwardsiellaictaluri, were held in water at 15 +/- 2*C. Following elevation of the water temperature to 25*C for 28 d, 77% died with clinical E. ictaluri infections. This level of mortality was significantly higher (p < 0.05) than mortality attributable to E. ictaluri when the water temperature was raised to 18*C (10%) or to 30*C (23%). Channel catfish naturally infected with E. ictaluri were exposed to 0, 100, 1000, 2000, and 3000 mg l-1 NaCl at 25*C for 28 d. Mortalities of channel catfish held in NaCl concentrations of 0 and 100 mg l-1 (100% and 96% respectively) were significantly higher than those held in NaCl concentrations of 1000, 2000, and 3000 mg l-1 (33, 43, and 17%, respectively).

Channel catfish . Bacteria . Salt . Temperature . Edwardsiella ictaluri

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