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58 CHANGE <br />~, . <br />~;; f <br />~~ <br />`+ <br />in various artificial or disturbed situations. Many of these species may in fact become <br />endangered as their normal biotic (and abiotic) associates gradually become disasso- <br />ciated from each other as the environment is modified by man's activities. Only when <br />a species achieves rare or endangered status are refuges set up, and they are likely to be <br />either too little, too late, or extremely expensive. It seems obvious that if the native <br />fish fauna is going to be preserved for future generations, aquatic habitats in each <br />major drainage basin will have to be managed at least in part for native fishes. Given <br />the heightened public awareness of ecology and the interest in natural history, perhaps <br />a series of fish refuges could be set up that embody many of the principles of state and <br />federal waterfowl refuges. Their primary purpose would be to provide habitat for the <br />maintenance of native fish populations and their vertebrate and invertebrate associates <br />but limited fishing and various noncomsumptive outdoor activities (e.g., fish watching) <br />would be encouraged. <br />a~~r~.~~~r-•~,.,., <br />