Brännäs, Eva
- Department of Wildlife, Fish and Environmental Studies, Swedish University of Agricultural Sciences
Research article2015Peer reviewed
A test of "nutritional wisdom" in perch (Perca fluviatilis) by self-selection of encapsulated macronutrients
Brännäs, Eva; Strand, Åsa
Abstract
Developing optimal diets based on fish macronutrient requirements is an expensive and laborious task requiring years of research. However, many species of fish can compose a species-specific optimal diet from single source macronutrients in capsules through self-selection. Eurasian perch is a species in which commercial culture is still in development and determination of whether this species can self-select its own diet is still unknown. Twenty-four individually held Eurasian perch (Perca fluviatilis) were trained to eat capsules of three different colours (purple, yellow and white) filled with a commercial diet. The fish exhibited a pronounced preference for the purple capsules. After training, capsules of each colour were then filled with either of three pure macronutrients to subvert the colour bias. There was still a preference of purple capsules which decreased with time. The resulting self-selection of macronutrients showed a significant lower selection of capsules with carbohydrates (17%) but no significant difference between fat (45%) and protein (38%). This self-selected proportion of macronutrients deviates from the recommended diet for farmed perch; 62% protein, 26% carbohydrates and 12% fat. The self-selected mean energy level with commercial feed in the capsules (133.0 +/- 10.6 kJ kg BW-1 day(-1)) filled with the commercial diet was significantly lower than when the capsules were filled with macronutrients (197.0 +/- 24.1 kJ kg BW-1 day(-1)). The perch actively selected against carbohydrates and reduced the number of capsules eaten when offered macronutrients, although not sufficient to keep daily energy intake at a constant level compared to the commercial diet. This result together with the preference for a specific colour implies that self-selection of diet composition may not be a suitable tool for the feed optimization of perch. (C) 2015 Elsevier B.V. All rights reserved.
Keywords
Self-selection; Perch; Perca fluviatilis; Macronutrients
Published in
Applied Animal Behaviour Science
2015, volume: 171, pages: 219-225
SLU Authors
Strand, Åsa
- University of Gothenburg
Global goals (SDG)
UKÄ Subject classification
Ecology
Fish and Aquacultural Science
Publication identifier
- DOI: https://doi.org/10.1016/j.applanim.2015.08.009
Permanent link to this page (URI)
https://res.slu.se/id/publ/68523