Variations of Body Composition and Growth among Strains of Rainbow Trout

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Abstract
Fish from six strains of rainbow trout (Salmo gairdneri) were fed the starter diet SD7 until reaching an average weight of 1.5 g. In the second segment of this trial, 1.5‐g fish from the six strains were fed the experimental diet X263 for 180 days. At the end of both trial segments, body composition varied significantly among strains of fish. After 180 days of diet X263, growth and feed conversion also differed significantly among strains. Changes in body composition averaged for all strains combined after 180 days of the diet X263 were as follows: crude protein decreased 8.2%; moisture decreased 5.7%; ash increased 6.2%. Data from the first segment of this trial give the strongest support to the hypothesis that variations of body composition of rainbow trout are influenced by genotype.