Norris-strain channel catfish fingerlings were held in flow-through
tanks at SNARC and maintained on 35% protein floating catfish feed
(Delta Western Feed Mill, Indianola, Mississippi) prior to bacterial
challenges; fingerlings (mean ± SD; 9.4 ± 6.2 g, 10.5 ± 2.0 cm) from
the same stock population were used for both experiments. Feed was
withheld for 24 h prior to and throughout challenges.