<p>The effect of water temperature prey capture success and foraging behavior of drift-feeding juvenile brown trout (<em>Salmo trutta</em>) was examined in a laboratory stream. Water temperature treatments were 5.7, 6.7, 8.0, 10, 12 and 14°C. Five wild brown trout, age 1+ and collected by electrofishing from a stream in Western Sweden, were used in the experiments. There was a significant effect of water temperature on both prey capture probability and the percentage of time spent resting on the substrate while drift-feeding. At low water temperatures the fish suffered a reduced prey capture capability and spent more time resting on the substrate in between the excursions to capture drifting prey. Temperature did not significantly affect the amount of time fish spent foraging holding a station in the current versus active searching. Significant positive correlations were found between holding a station and prey capture probability at four out of the six different water temperature treatments.</p><p> </p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:kau-3328 |
| Date | January 2008 |
| Creators | Watz, Johan |
| Publisher | Karlstad University, Faculty of Social and Life Sciences |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, text |
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