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Summer food limitation reduces brook and rainbow trout biomass in a southern Appalachian stream


, : Summer food limitation reduces brook and rainbow trout biomass in a southern Appalachian stream. Transactions of the American Fisheries Society 119.5: 894-901

Salmonid production in summer is assessed in a second- and third-order montane stream in eastern Tennessee in 1987. We sampled three stream sections, one containing exclusively brook trout Salvelinus fontinalis , one containing exclusively rainbow trout Oncorhynchus mykiss , and a third with a mixture of both species. Population estimates for July and Oct 1987 revealed reductions in biomass over the 4-month period that ranged from 31 to 49%, whereas population densities declined by 32-46% during the same period. Total net production during the 4-month period was low and ranged from 0.38 to 0.45 g/m super(2). From Jun-Sep, the mean number of prey items per stomach ranged from 4.2 to 29.9, whereas the mean relative weight of stomach contents ranged from 0.12 to 1.34 mg dry weight per gram wet weight of fish flesh. There was a strong positive correlation between the mean relative weight of stomach contents and the mean condition factor for a given date. Calculated energy intake was below the level necessary to provide energy for maintenance metabolism.


Accession: 018137639

DOI: 10.1577/1548-8659(1990)119<0894:SFLRBA>2.3.CO;2

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Related references

Ensign W.E.; Strange R.J.; Moore S.E., 1990: Summer food limitation reduces brook and rainbow trout biomass in a southern appalachian stream tennessee usa. We assessed salmonid production in summer in a second- and third-order montane stream in eastern Tennessee in 1987. We sampled three stream sections, one containing exclusively brook trout Salvelinus fontinalis, one containing exclusively rainbow...

Larson, GL.; Moore, SE., 1985: Encroachment of exotic rainbow trout into stream populations of native brook trout in the southern Appalachian Mountains. Since 1900, the distribution of native brook trout S. fontinalis has shrunk in the southern Appalachian Mountains area. Initial reductions were caused by logging and heavy fishing pressure but, in later years, encroachment by exotic rainbow trout...

Lohr, S.C.; West, J.L., 1992: Microhabitat selection by brook and rainbow trout in a southern Appalachian stream. The decreased range of native brook trout Salvelinus fontinalis in the Great Smoky Mountains National Park has been attributed to competition with introduced rainbow trout Oncorhynchus mykiss. To determine whether brook trout were displaced from p...

Larson G.L.; Moore S.E., 1985: Encroachment of exotic rainbow trout salmo gairdneri into stream populations of native brook trout salvelinus fontinalis in the southern appalachian mountains usa. Since 1900, the distribution of native brook trout S. fontinalis has shrunk in the southern Appalachian Mountains area. Initial reductions were caused by logging and heavy fishing pressure but, in later years, encroachment by exotic rainbow trout...

Ensign, W.E.; Habera, J.W.; Strange, R.J., 1989: Food resource competition in southern Appalachian brook and rainbow trout. Proceedings of the Annual Conference Southeastern Association of Fish and Wildlife Agencies. October 29-November 1; 43: 239-247

Cada, G.F.; Loar, J.M.; Sale, M.J., 1987: Evidence of food limitation of rainbow and brown trout in southern appalachian usa soft water streams. Seasonal patterns of age-specific growth rates and condition factors of rainbow trout Salmo gairdneri and brown trout S. trutta were studied in relation to the available food resources in five streams of the southern Appalachian mountains. Standin...

Cada, G.F.; Loar, J.M.; Sale, M.J., 1987: Evidence of food limitation of rainbow and brown trout in southern Appalachian soft-water streams. Seasonal patterns of age-specific growth rates and condition factors of rainbow trout Salmo gairdneri and brown trout S. trutta were studied in relation to the available food resources in five streams of the southern Appalachian mountains. Standin...

Whitworth W.E.; Strange R.J., 1983: Growth and production of sympatric brook trout salvelinus fontinalis and rainbow trout salmo gairdneri in an appalachian usa stream. A small, 2nd-order stream in the southern Appalachians was sampled every 2 mo. from Sept. 1978-Oct. 1979. The 1.5 km study segment was divided into 50, 30m sections grouped into 3 areas: a downstream area with only rainbow trout S. gairdneri; a mi...

Whitworth, WE.; Strange, RJ., 1983: Growth and production of sympatric brook and rainbow trout in an Appalachian stream. A small, 2nd-order stream in the southern Appalachians was sampled every 2 mo. from Sept. 1978-Oct. 1979. The 1.5 km study segment was divided into 50, 30m sections grouped into 3 areas: a downstream area with only rainbow trout S. gairdneri; a mi...

Strange, R.J.; Phirman, R.M.; Habera, J.W., 2000: Movement, growth, and production of brown trout in sympatry with brook trout in a southern Appalachian stream. Proceedings of the Annual Conference Southeastern Association of Fish and Wildlife Agencies, 54: 146-156