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Effect of sampling interval and temperature on the accuracy of food consumption estimates from stomach contents



Effect of sampling interval and temperature on the accuracy of food consumption estimates from stomach contents



Journal of Fish Biology uary; 66(1): 33-44



The effect of temperature and sampling interval on the accuracy of food consumption estimates based on stomach contents was Studied using simulation. Three temporal patterns of feeding were considered (scattered throughout the day, one 5 h period or two 5 It periods) and gastric evacuation was modelled according to published values. Sampling intervals of 3 It Rave reasonable food consumption estimates (2 to 19% error) at all temperatures. Comparably, sampling intervals as large as 12 h gave reasonable estimates of food consumption (1 to 20% error) when temperature was set to = 10[degree] C. At temperatures 5[degree] C. even 24 It intervals (equivalent to one daily sampling) provided reasonable estimates of daily food consumption (2 to 19% error) for all but the hi-hest gastric evacuation rate combined with one daily feeding period (47% error). The temperature effect on estimation error resulted front diminishing temporal fluctuations in stomach contents with slower gastric evacuation rates. It follows that sampling effort may be considerably minimized when estimating food consumption from stomach contents during periods with low temperatures such as the winter time experienced by temperate fishes. [copyright] 2005 The Fisheries society of the British Isles.

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Accession: 004126572

Download citation: RISBibTeXText

DOI: 10.1111/j.0022-1112.2005.00577.x


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