Community Research and Development Information Service - CORDIS

Dietary vegetable lipids and diet discrimination capacities

The present study confirms the possibility to use self-feeders for determining feed preferences in fish. The rainbow trout clearly detected the presence of vegetable oils and expressed a preference for the fish oil diet. Among the three vegetable oils tested, linseed oil was the most avoided, followed by sunflower oil, while rapeseed oil was better accepted by the fish. The avoidance of the vegetable oil diets was compensated by increased demands for the FO diet. As a consequence, despite the important differences in relative feed preference, no differences were observed in total feed intake or in final body weights of fish from the different dietary treatment combinations. Longer term feeding studies with similarly high-fat diets and full fish oil replacement are necessary to distinguish if present preferences were steered by the flavour or by the nutritional value of the oils.

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