The effects of changing feeding frequency simultaneously with seawater transfer in Atlantic salmon Salmo salar L. smolt |
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| Authors: | Matthew J Flood G John Purser Chris G Carter |
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| Institution: | (1) Department of Agriculture, Fisheries and Forestry, Australian Bureau of Agricultural and Resource Economics and Sciences, GPO Box 1563, Canberra, ACT, 2601, Australia;(2) National Centre for Marine Conservation and Resource Sustainability, Australian Maritime College, University of Tasmania, Locked Bag 1370, Launceston, TAS, 7250, Australia;(3) Tasmanian Aquaculture and Fisheries Institute, Marine Research Laboratories, University of Tasmania, Private Bag 49, Hobart, TAS, 7001, Australia |
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| Abstract: | The effects on group feed intake and growth performance of changing feeding frequency simultaneously with seawater transfer
of Atlantic salmon Salmo salar were investigated. Two feeding regimes of one feed per day (1F) and eight feeds per day (8F) were compared for groups of
Atlantic salmon in freshwater. Following seawater transfer groups were either fed on their pre-transfer regimes or swapped
to the other regime, resulting in four treatments (n = 3). Regardless of the pre-transfer feeding regime, 1F groups had significantly (P < 0.05) lower feed intake immediately following transfer than 8F groups. However, groups that underwent a change in feeding
frequency did not have significantly lower feed intake immediately following transfer than those kept on the pre-transfer
feeding regime. During the freshwater phase, overall mean feed intake of 8F groups was significantly greater than 1F groups,
whilst there was no significant difference in mean feed intake for any of the treatments during the seawater phase. Growth
was better in groups fed 8F in freshwater than those fed 1F in freshwater regardless of post-transfer feeding regime. There
were no significant differences in growth depensation throughout the experiment, suggesting that there were no overall differences
in hierarchy strength amongst treatments. The main finding of this experiment was that a single meal per day immediately following
seawater transfer results in initially significantly lower feed intake than the higher feeding frequency regardless of pre-transfer
feeding regime, consequently multiple daily feeds is the recommended feeding regime following seawater transfer. |
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