Trout Production and Standing Crop in Colorado's Small Streams, As Related to Environmental Features
- 1 July 1987
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 7 (3) , 315-330
- https://doi.org/10.1577/1548-8659(1987)7<315:tpasci>2.0.co;2
Abstract
Annual production of trout (Salvelinus and Salmo spp.) in 10 small northern Colorado streams (elevation 2,146-3,139 m above sea level) ranged from 1.5 to 18.4 g/m 2 in 1979 and 1980. Midsummer biomass ranged from 3.9 to 28.2 g/m 2. Ratios of production to biomass ranged from 0.23 to 0.95. Fish production and biomass were related inversely to elevation and directly to substrate diversity, conductivity, alkalinity, and water hardness. Combinations of the various factors explained much of the variation in production: elevation and width:depth ratio, 60%; elevation and substrate diversity, 54%; elevation, substrate diversity, and percentage of zero-water-velocity stations, 79%; and elevation, width: depth ratio, and alkalinity, 77%. Similar relationships were developed for midsummer biomass. There was a strong correlation between midsummer biomass and annual production as well as between annual production and the density of fish of desirable size (152 mm long or longer) in each stream. Several relati...Keywords
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