Habitat Requirements for Freshwater Fishes

摘要: Freshwater fishes have evolved to occupy most freshwater habitats, some of which are naturally very harsh. This diversity allows freshwater fishes to occupy habitats that have been greatly altered and allows some altered habitats to support important recreational fisheries. Fish habitat assessment can be simplified by carefully examining project goals and anticipating potential habitat problems. Adequate assessments can often be accomplished by measuring certain water quality parameters and physical attributes such as, substrate size, amount and type of instream cover, amount and type of riparian vegetation, flow regimes, and stratification regimes. A wide range of values can provide quality fish habitat in most regions, however, specific, well stated project goals will probably considerably narrow the range of acceptable values and will probably simplify the design process. 12.