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32 Question 9: In your opinion, what are possible field techniques or other approaches that wildlife management agencies might use to lessen, or eliminate problems or impacts created by introduced species? Five respondents suggested a philosophical assessment was in order prior to any discussion of active negative management of problematic introduced species. These are paraphrased below: * Honestly assess relative values. If native fish are valued higher, explore means to remove nonnatives and prevent re-establishment This is very difficult and costly, however. * Assess whether introduced species are the primary or secondary cause qf the impacts. Attempt removal of nonnatives only if they are the primary cause. * We must identify problems first and attempt to target vulnerable life stages (of nonnatives ). * The real question ought to be: "Can we restore the habitats in the Green and Colorado rivers to their original conditions, which would favor the needs of endemic fishes?" The answer is obviously no, due to the dams! A further issue, assuming interspecific competition from exotic fishes, is how to maintain or reduce the exotic population numbers?" * We may be able to more effectively manage for endemics and against introduced fishes. - Five respondents provided a philosophical perspective based on what they perceived as the reality of problems posed by introduced species. Several indicated no practical, realistic, or effective solutions existed for eliminating or solving these problems. Two other responses suggested these problems are permanent and recovery efforts or management should be targeted at determining the extent of the impacts and the efficacy of control measures. Remaining responses offered approaches which could be grouped into five major categories. These were sport fishery regulation, sportfish stocking, eradication, habitat management, and hatchery augmentation. In almost all cases, these approaches were not offered as singular techniques, but as elements of a comprehensive approach using multiple techniques from one or more categories.