Effect of stream microhabitat characteristics on rate of net energy gain by juvenile smallmouth bass, Micropterus dolomieu |
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| Authors: | Matthew J Sabo Donald J Orth Edmund J Pert |
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| Institution: | (1) Department of Fisheries and Wildlife Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061-0321, U.S.A.;(2) Present address: School of Forestry, Wildlife, and Fisheries, Louisiana State University, Baton Rouge, LA, 70803-6200, U.S.A. |
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| Abstract: | Synopsis We estimated the rate of energy consumed and expended by 43 juvenile smallmouth bass, Micropterus dolomieu, videotaped in the North Anna River during 1991. Habitat data were also collected in the areas where each individual was videotaped. The net rate of energy gained (J·min–1) increased as water depths decreased and mean water-column velocities increased. This relationship remained statistically significant even when we assumed that consumption was as little as 40% of our original estimates, and that respiratory costs were three times higher than we suspected. The net rate of energy gained by juvenile smallmouth bass was only affected by the characteristics of the area that they searched and not the foraging tactics they employed. |
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| Keywords: | Microhabitat use Foraging behavior Active metabolism Fish growth |
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