Abstract
Largemouth bass virus (LMBV) is an iridovirus that was isolated from wild adult largemouth bass Micropterus salmoides in the southeastern United States in 1994. Although originally isolated from moribund wild fish, its virulence to juvenile largemouth bass is uncertain. To help clarify this point, two LMBV titrations were made in juvenile largemouth bass. Titers of LMBV in fathead minnow cells were 104.8 and 105.8 tissue culture infectious doses—50% cytopathic endpoint (TCID50) per milliliter, respectively. Tenfold serial dilutions of LMBV employed in each cell culture titration, injected intraperitoneally (0.1 mL/fish) into largemouth bass produced calculated lethal dose—50% mortality endpoints (LD50s) of 282 (102.45) and 288 (102.46) infectious doses in two consecutive infectivity trials. Virus yield of assayed infected fish averaged 108.5 TCID50/g and 107.7 TCID50/g in viscera of moribund and dead fish in the two trials and 106.5 TCID50/g in surviving exposed fish 14 d after infection. In a se...

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