Biomass Model of Reservoir Fish and Fish-food Interactions, with Implications for Management
- 1 April 1982
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 2 (2) , 105-121
- https://doi.org/10.1577/1548-8659(1982)2<105:bmorfa>2.0.co;2
Abstract
A mathematical model was developed to help evaluate trophic relations of fishes in reservoirs and to assess the effects of perturbations (e.g., reservoir operations, species introductions, stocking, and harvest) on reservoir ecosystems. The model estimates the production and food requirements of five functional groups of fish biomass, established according to the food supporting each group-(1) plants and detritus, (2) benthos, (3) zooplankton, (4) fish, and (5) terrestrial invertebrates. When applied to data collected from 1977 to 1980 in DeGray Lake, Arkansas, the model revealed that the biomass of fish supported by diets of plants and detritus (BSPD) was positively correlated with precipitation within and among years. The BSPD, expressed as a percent of the total standing crop, declined significantly from 1974 to 1977 and then stabilized at a low level from 1977 to 1980. In 1979, primary production was insufficient to sustain zooplankton production and BSPD from June to mid-August, and from lat...Keywords
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