Abstract
Fish farmers have long suspected that farmed cod were less heavily infected with larvae of ascaridoid worms than fish taken in the commercial fisheries. To test this hypothesis, a field experiment was designed to compare the worm burdens of caged and wild-caught fish over a 2-year period. The results showed an increase in the worm burdens of the wild fish but not in the caged fish. It is suggested that the transmission of food-transmitted ascaridoid larvae is broken through artificial feeding, which prevents new infections from establishing in the caged fish. The life expectancy of these worms in cod is probably more than 2 years.
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