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23. When deemed desirable reintroduce marked htm~pback chubs (wild <br />or hatche stock into five stable habitats to achieve desired <br />densities of spawning adults. <br />If and where needed, humpback chub gopulations can be restored <br />or enhanced by transplanting chubs. These fish should only be <br />stocked into habitats is which subsequent natural reproduction is <br />possible. Moreover, it is inadvisable to transplant stocks from <br />one population to another, e.g. rearing chubs from the Grand <br />Canyon and stocking offspring into the Yampa River. It may be <br />necessary to artifically sustain wild populations for short <br />periods while habitat management techniques are developed and <br />implemented. Reintroductions must sot be made in areas where <br />habitat is unavailable or cannot be restored. <br />231. Su lenient four exiatin o ulations with stocked fish <br />if deemed necessary. <br />When the status of the four known populations is deter- <br />- mined, it may be necessary to temporarily bolster their <br />numbers with hatchery-reared fish. The zoogeographic <br />(genetic) integrity of each population must be maintained. <br />The real hope of maintaining existiag,Pcpulationa will be <br />is providing vital reproductive habitat, not hatchery <br />culture programs. <br />232. pleat humpback chubs into unoccupied areas when habitat <br />is restored and maintained. <br />Areas in which humpback chubs previously occurred should be <br />managed to provide useable habitat. Populations can be <br />established by stocking. wild or hatchery fish into these <br />areas.. The• restoration areas should be geograpbically <br />isolated from existing populations. In this way a single <br />natural or man=made biological disaster cannot destroy <br />several humpback chub populations. <br />17 <br />