Abstract
Abstract Gastric evacuation of a single meal of zooplankters by young yellow perch was about half as fast as that of a similar meal under conditions of continuous feeding. Time for gastric evacuation of a single meal of 150 to 200 daphnids by 60-mm perch at 15 C was 12 hours compared to only 6 hours for a similar meal under conditions of continuous feeding. Likewise, 30- to 40-mm perch fed 10 daphnids at 22 C required 6.5 and 1.5 hours respectively for single and multiple meals. Longer evacuation times were required for larger initial meals when subsequent meals were fed to 30- to 40-mm fish at 22 C. Median evacuation time for the first daphnid consumed was only 0.6 hour compared to 2.6 hours for the one-hundredth daphnid. Evacuation time for continuously feeding fish increased with size of fish. Gastric evacuation time at 20 to 22 C increased from 0.6 hours for fish 17 to 19.5 mm long to over 3 hours for 45-mm fish. Because of the effect of meal sequence on evacuation time, conventional methods of estima...
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