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Effect of group size on feed intake, growth and feed efficiency of juvenile perch

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Feed intake, growth and feed efficiency of juvenile perch Perca fluviatilis were significantly affected by group size, with fish in groups of 12 having lower feed intake, higher growth and higher feed efficiency than solitary individuals. The same trend was seen for fish in groups of 12 compared to fish in groups of four, and for fish in groups of four compared to solitary individuals, although the differences were not always significant. The high growth and low feed efficiency for fish in groups may be caused by benefits obtained from shoaling such as reduced levels of stress.

Keywords: Perca fluviatilis; energetic growth efficiency; feed intake; group size; growth

Document Type: Research Article


Affiliations: Department of Aquaculture, Swedish University of Agricultural Sciences, S-901 83 Umeå, Sweden

Publication date: August 1, 2007


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