Influences of Dieldrin on the Growth and Body Composition of Fingerling Rainbow Trout (Salmo gairdneri) Fed Oregon Moist Pellets or Tubificid Worms (Tubifex sp.)

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Abstract
Fingerling rainbow trout (S. gairdneri) fed tubificid worms (Tubifex sp.) grew faster than those fed Oregon Moist Pellets (OMP) over a similar range of rations. Faster growth resulted because trout incorporated protein and fat from tubificids more efficiently than from OMP. Exposure to a sublethal concentration of insecticide dieldrin in water (0.18 .mu.g/l) did not affect the protein elaboration of trout fed either diet or fat metabolism in trout fed OMP. Dieldrin reduced fat elaboration in trout fed tubificids. The dieldrin concentrations in trout exposed to dieldrin in water increased as feeding level (body fat) increased. The different responses to dieldrin by fish fed these 2 diets provides evidence that the diet offered to fish can significantly influence the outcome of chronic toxicity tests.