Graduate Thesis Or Dissertation
 

Evidence for the nonessentiality of ascorbic acid in the diet of the rainbow trout, Salmo gairdneri

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  • Numerous tests were applied to rainbow trout of eleven months of age to determine whether ascorbic acid is an essential element of the diet of these fish. Although previous work had been done on this question, conflicts in the results, the large reliance upon abnormal symptoms such as lordosis and .scoliosis for the diagnosis of scurvy, failure to determine the nutritional status of the experimental animal, and the tricontpleteness of the tests made for scurvy, seemed to warrant this further effort. Tests showed that the experimental fish were depleted of ascorbic acid significantly below a level of the control trout, however, no affects upon growth, formation and replacement of collagen, haematological condition, spleen development, fat metabolism, or mortality rate, could be detected. Specifically, lordosis and scoliosis failed to develop not only in fish of an initial age of eleven months but also in fish of an initial age of two months, with the exception of one case of scoliosis out of a total population of three hundred. It is hypothesized that the results of others that show the dietetic requirement of ascorbic acid by the salmonids may be caused by an interrelationship of ascorbic acid with another vitamin. Further work to verify the findings of this experiment and hypotheses rising therefrom are planned.
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