Analyses of Gastric Emptying in Bluegill (Lepomis macrochirus)

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Abstract
Bluegill (Lepomis macrochirus) fed a single meal averaging 111.6 mg dry wt (2.19% body wt on a wet fish and food basis) showed an average of 60 mg (54%) of the meal remaining after 8 h of digestion compared to 71 mg (59%) of an equivalent amount of food (119.6 mg or 2.04% body wt) fed in two consecutive meals. Fish fed a single meal averaging 167.2 mg (2.74% body wt) showed an average of 41% of the meal remaining 12 h after feeding, while fish fed three consecutive meals totaling 140.3 mg (2.51% body wt), showed an average of 47% of the food intake remaining 12 h after they were first fed. Two statistical models — an exponential and a multiple regression — relating food digested to meal size and time of feeding were developed. Both statistical models, when based on results of fish fed single meals, failed to predict values comparable to those observed for bluegill fed multiple meals.

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