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The prevalence of infections by trematodes Bolbophorus sp. in populations of pond-raised channel catfish Ictalurus punctatus was determined by sampling 64 ponds on a farm in northwestern Mississippi. Of the 40 food fish ponds sampled, 23 (58%) contained trematode-infected fish; 7 pond populations were categorized as having light infections (1–33% infection rates), 5 as having moderate infections (34–66% infection rates), and 11 as having severe infections (≥67% infection rates). Only 3 of the 24 fingerling ponds contained fish infected with Bolbophorus trematodes, and the infection rates were light. Feed consumption and estimated fish production in food fish ponds differed significantly among the four categories of within-population infection rate, and feed consumption and fish production decreased as infection rates increased. Relative to the production in uninfected populations, estimated fish production …