|Rawles, Steven - Steve|
Submitted to: Book of Abstracts Aquaculture America
Publication Type: Abstract Only
Publication Acceptance Date: 12/3/2004
Publication Date: 1/16/2005
Citation: Lochmann, R., Rawles, S.D., Gaylord, T.G. 2005. Body indices, blood lipid class composition and proximateanalysis of sunshine bass fed diets with different amylose to amylopectin [abstract]. Book of Abstracts, Aquaculture America. p. 246. Interpretive Summary:
Technical Abstract: Changing the relative amounts of amylose and amylopectin in the diet can improve carbohydrate utilization in mammals, and this concept may be applicable to fish. A 7-week feeding trial with fingerling (160 g) sunshine bass Morone chrysops x M. saxatilis was conducted using isonitrogenous purified diets containing 25% carbohydrate with different amylose:amylopectin ratios. At the end of the trial, body indices and blood lipid classes of fasted fish were determined. Fish fed glucose had the greatest number of body indices that differed from fish fed diets with different ratios of amylose and amylopectin. Liver size (1.5-2.7%)and glycogen content (24-40% dry-weight basis) were significantly greater in fish fed the diet containing glucose but were unaffected by starch ratio. Body fat content was not significantly different among treatments and ranged from 5 to 6.5%. Whole fillet ratio was significantly higher in fish fed the high amylose diet (48.6%) and lowest (46%) in fish fed the diet containing glucose. Blood lipid classes of fish fed the 100PEC diet were generally higher or lower that those of fish fed other diets. On the other hand, plasma free fatty acids tended to increase (from 8.7 to 11.6%) with increasing dietary amylose content. Circulating triglycerides were highest in fish fed diets containing glucose or an intermediate mix of starch types and lowest in fish fed the highest or lowest amylose content. Differences are most likely associated with speed of digestion of the different carbohydrate types, and to subsequent differences in the relative rates of lipogenesis and glycogen synthesis. Proximate composition data from muscle and liver is pending ' results should help clarify differences in response to dietary carbohydrate types in sunshine bass.