6013

• UCREFRP Catalog Number: 6013
• Author: U.S. Fish and Wildlife Service, C. R. F. R. T.
• Title: Humpback Chup Recovery Plan.
• USFW Year: 1979.
• USFW - Doc Type: \
• Copyright Material: NO

111. Detea~mine the sisal and cficmicai chars eristics of the
includinst spewninA
habitat used b~- present populations.
areas.
Ia situ"determinations of water depth, temperatures, velocity,
turbidity, substrate type, and other chazacteristics will
be used to develop electivity curves for several life
stages of the humpback chub.
112. Determine biolo ical habitat characteristics.
The interactions of humpback chubs with other fishes,
invertebrates, aad certain disease organisms will be
investigated. Competition for space fa spawning and nursery
habitats with other species will be researched.
113. Establish historical and current reasons for reduced numbers
aad distribution.
The reasons for the decimination of the humpback chub
populations in the upper Green River. aad Colorado River
in the Grand Canyon are well known (population reduction
followed by loss of spawning habitat). The causes of
declines in other areas may be postulated by examining
historical data describing habitat and humpback chub
occurrence.
12. Deteaine the location and status of available and potential
habitat.
aad describe sites in which populations
Methodology to identify
can be maintained or established will be•developed.
121. Research methods of identifvine and aaalvzing natural
s awnia and nurse sites ~mi ration routes or other
habitats.
.Criteria must be established and. refined to locate aad
describe reproductive sites, nursery sites, feeding and
resting areas. Habitat descriptions will aid is selecting
sites for restoration of the species. Incremental analysis
of habitat may be used.
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