Abstract

Feeding intensities (number of bites per minute) were recorded each hour over a 24-h diel cycle for young grass carp fed three diets. The grass carp did not show distinct meals. Grass carp receiving plant diets (duckweed or elodea) fed almost continuously throughout the 24 h, while fish fed the animal diet (tubificids) ceased feeding or had very low feeding intensities for about a quarter of the diel cycle. The average feeding intensity in fish fed duckweed was three times higher than that in fish fed elodea and tubificids. Average dry matter intake per bite was much higher in fish fed the animal diet than in those fed the plant diets. In most individuals, there was no significant difference in feeding intensity between daytime and nighttime.

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