Abstract
Food competition in the herring (Clupea harengus) was investigated in an experimental tank during changes in the motivational state of the individuals, in this case promoted by hunger. Shoal density, time for fish to encounter food, and interference with other shoal members were examined under two different hunger levels. A 48 h food deprivation period produced a significant reduction in shoal density and time for fish to encounter food, compared with the well‐fed condition. Competition for food increased significantly during the 48 h food deprivation period. Results suggest that competition for food in a school of fish may be not as strong as would be expected from calculated estimations.
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