Feeding behaviour of the central mudminnow,Umbra limi,in the field and laboratory

Synopsis The field component of this study compared feeding preferences of Umbra limi with available resources in the environment. The mudminnows preferred benthic coleopterans, anisopterans, and amphipods while avoiding planktonic and other benthic food types. The laboratory component tested for possible switching behaviour by offering different ratios of two food types (Enchytraeus worms and Culex larvae). Both components indicated a benthic feeding preference in mudminnows. Although preferences were variable across individuals, switching did not occur, a result consistent with recent predictions on predatory behaviour. Feeding patterns reflected individual differences among fish, runs of feeding on one food type, and a constancy in the total number of the two food types eaten.