Rainbow trout, feeds fingerling in special ponds and markets them when they attain a certain weight. A group of 9 trout were isolated in a pond and fed a special mixture called grow em fast. At the end of the experimental period, the weights of the trout were in grams 124, 125 123 120 124 127 125 126 121. another special mixture fatso 1b was used in another pond the mean of the population was computed to be 126.9 grams and the standard deviation was 1.20 grams. which food results in more uniform weight.