A Method For Analysis of Differences in Fish Community Species Occurrences

The occurrences of the 20 most abundant fish species in impoundments of each of seven rivers were compared using Long's (1963) index of faunal resemblance. Higher order systems, i.e., larger rivers, contain more species than smaller rivers. Also, impoundments of larger river systems tend to be more similar, while those on smaller rivers maintain their unique faunal assemblages.