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221. Research methods o! detertaining population dynamics and the biological potential o! the ^pecies to respond to management. Basic research about the natality, growth rate, age at reproduction, mortality, movements, etc. will provide data about population characteristics. Simulation models may be coastszicted~to predict the responses of humpback chub populations to habitat changes. .Beneficial habitat manage- ment practices,'such as optimum flows or temperature regimes, can they be recommended. 222. Research non lethal sampling techniques to collect humpback chubs and sympatric species effective_y. Available sampling devices and techniques are inadequate. •Gill and trammel nets are most effective for catching chubs but-caa cause direct mortality orliavite diseases to gain a foothold. Electrofishing devices cause less mortality, but are inefficient in deep, swift rivers or in waters with high conductivity. Innovative research is needed to develop better methods of sampling and observing humpback chubs without killing or injuring them. 223. Determine population size and structure through tagging (or oche:vise marking). ' Estimates of population size and age class campositioa will be made by mark-recapture census techniques or other methods. The.car=ying capacity of suitable habitats must be detes- mined. Such studies will likely be contracted to a competent researcher. ~ . 224. Recaa®ead cvatractors and agencies to implement population monitoring techniques. Beaouree agencies with wildlife management responsibilities will monitor humpback chub populations using techniques developed by researchers. Atmual estimates of year-class size, reproductive success, sad distribution will be•used to measare population stability and the success of reintro- dnction programs. 16