Implications of dietary lipid and carbohydrate intake on the liver and the susceptibility of hatchery-reared rainbow trout (Salmo gairdneri) to vibriosis Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/dj52w705m

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  • The hypotheses to be tested in this investigation are: 1) there is a threshold level of liver lipid and glycogen content above which the health condition of hatchery-reared fish is impaired, 2) fatty and high glycogen livers impair liver function and structure, and 3) fatty and high glycogen livers increase the susceptibility of fish to vibriosis. Under the conditions of this study, levels of hepatosomatic index, specific gravity, liver lipid and glycogen content sufficient to cause pathologic conditions in rainbow trout were not established. Blood parameters like hematocrits and mature red blood cell counts were found to be normal. The condition factors (K) were indicative of well fed fish. It was concluded that all the above parameters fell within a normal range of values representative of healthy rainbow trout. Determination of plasma alanine aminotransferase activity and histological examination of the livers did not indicate any sign of liver pathology. It was concluded that all the livers were normal and healthy, even though the liver composition varied with each dietary treatment. The disease challenge did not reveal any difference in susceptibility to vibriosis as measured by cumulative mortalities and mean day to death. The agglutinating antibody titers against Vibrio anguillarum were similar in strength and might have been protective. It was concluded that susceptibility to disease was unaffected by the different liver composition observed for each dietary treatments.
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