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Gear bias in field estimation of the amount of food consumed by fish



Gear bias in field estimation of the amount of food consumed by fish



Canadian Journal of Fisheries & Aquatic Sciences 46(5): 874-876



We made concurrent collections of small (85-100 mm total length) yellow perch (Perca flavescent) at the bottom of Lake Erie (USA) with an active gear (otter trawl) and a passive gear (gillnet) within a 24-h sampling period. During daylight periods when yellow perch feeding activity was most prominent, gilnetted fish possesed significantly higher median food amounts in stomachs than did trawled fish. Estimated daily food consumption for small yellow perch was 5.86% of body weight by gillnet sampling and 3.98% by trawl sampling. Passive gears tend to sample the most active fish (more likely to be feeding) and may, therefore, yield upwardly biased estimates of food consumption for individuals within a population. Active gears are considered to give more accurate estimates because quiescent and low activity, as well as the more active members of a population, are sampled.

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Accession: 007370347

Download citation: RISBibTeXText

DOI: 10.1139/f89-111


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