The purpose of this study is to relate simulated water quality with fish presence
observations. The typical seasonal patterns of water temperatures and dissolved oxygen
concentrations in twenty-seven classes of Minnesota lakes have been simulated by calibrated
models and related to observations of three fish guilds i.e, coldwater, coolwater, and
warmwater fishes. Data from 3002 lakes were available in the Minnesota Department of
Natural Resources lake database. Water temperature and dissolved oxygen criteria derived
from a very large USEP A fish-temperature data base and dissolved oxygen observations
were used to define and link simulated water temperatures and dissolved oxygen conditions
to suitability of habitats for various species of fish. One-dimensional, dynamic models driven
by 25 years of observed weather data were used to model daily water temperature and
dissolved oxygen as a function of depth. The lakes are categorized according to surface area,
maximum depth, and Secchi depth as a measure of trophic state. Good agreement between
fish observations and numerical simulations of fish habitat defined by water temperatures
and dissolved oxygen concentrations was found.
Environmental Research Laboratory, US Environmental Protection Agency
Stefan, H. G.; Hondzo, M.; Eaton, J. G.; McCormick, J. H..
Comparisons of Actual Fish Observations with Simulated Suitable Fish Habitat in Minnesota Lakes.
St. Anthony Falls Hydraulic Laboratory.
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