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Rates of digestion of different prey in atlantic cod gadus morhua ocean pout macrozoarces americanus winter flounder pseudopleuronectes americanus and american plaice hippoglossoides platessoides

Rates of digestion of different prey in atlantic cod gadus morhua ocean pout macrozoarces americanus winter flounder pseudopleuronectes americanus and american plaice hippoglossoides platessoides

Canadian Journal of Fisheries & Aquatic Sciences 39(5): 651-659

Stomachs of ocean pout (Macrozoarces americanus), Atlantic cod (Gadus morhua), winter flounder (Pseudopleuronectes americanus) and American plaice (Hippoglossoides platessoides) were removed and dissected 5, 12, 20 and 30 h after the fish had fed voluntarily to test the evacuation rates of 3 different prey species. Two evaluation procedures were used: a visual index of recognizability, and a graphical analysis of percent of each prey recovered vs. time since feeding. Three decay models were tested for goodness of fit to the evacuation data. The polychaete worms were the first to become unrecognizable, followed by amphipods. These species showed significantly different rates of evacuation when compared with the bivalves which were recognizable for the longest time. The exponential decay curve gave the best overall fit to the data, but a linear model gave a good or better fit to the decay rate of the bivalve. The evacuation rates of different prey should be considered in estimating daily rations of fish in their environment.

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Accession: 006262807

Download citation: RISBibTeXText

DOI: 10.1139/f82-094

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