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11-08-2010, 02:52 PM #1
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The Effect of Temperature and Ration Size on the Growth, Body Composition, and Energy
By Thomas A. Edsall, Anthony M. Frank, Donald V. Rottiers, Jean V. Adams
Journal of Great Lakes Research, Volume 25, Issue 2, 1999, Pages 355-362, ISSN 0380-1330, DOI: 10.1016/S0380-1330(99)70744-6.
Juvenile (post-smolt) coho salmon (Oncorhynchus kitsuch) were held in fresh water in the laboratory at 5, 10, 15, and 18[degree sign]C for 8 weeks and fed freshly thawed, juvenile alewives (Alosa pseudoharengus) at rates equal to 1 and 2 % of their wet body weight/day, and also at the ad libitum or unrestricted ration rate. Most rapid growth in weight (1.2% wet body weight/day) occurred among fish fed the ad libitum ration at 15[degree sign]C; growth was most rapid at about 10[degree sign]C for fish fed the 2% ration (0.7% /day), and the 1% ration (0.1% /day). Gross conversion efficiency was highest at 10[degree sign]C for all three ration levels. Gross body constituents and energy content of the test fish changed with temperature and ration during the study. Growth rate was positively related to lipid, energy content, and ration; lipid and energy content were positively related to water temperature; lipid, energy content, growth rate, ration, and water temperature were negatively related to water content; and protein was not related to any of the test variables. At the end of the study, water (68.7 to 76.4%) and lipid (3.5 to 10.4%) content were more variable than ash (1.8 to 3.1%), carbohydrate (0.1 to 1.9%), and protein (16.9 to 19.4%) content. Energy content of the fish increased with ration and was highest for each ration level at 15[degree sign]C.
Keywords: Coho salmon; growth; bioenergetics; proximate composition; Great Lakes