4211

• UCREFRP Catalog Number: 4211
• Author: Ulmer, L.
• Title: Management Plan for the Razorback Sucker ‎(
• USFW Year: 1985.
• Copyright Material: NO

3. U-^
~_ .
razorbacks continue to be observed in Labe Mead, Arizona-Ncv~.~da
(Cal Allen, Nevada Dc~partr:rent of t~lildlif_e [NDOaa], pers. common. );
[~cCall 1980), lout the population is believed to be low,-with no
documented recruitrilen!~.
A situation si.rnilar to that in Senator i~raah Reservoir srerns
to prevail in Lake [Mohave (Hinckley 19f33; Paul Marstl, Arizona
State University [AS~I], pers. common.} where larval razorback have
commonly been found, but no recruitment occurs into the adult
population. Exotic f_i~hes, principally Ureen sunfish, prey
Heavily on razorback sucker recruitment. If_ this continues,
mortality of senescent razorbact~, adults vaill obviously result in
extinction of both the Mohave and Senator t9ash populations.
Collections in habitats other than reservoirs have- either
resulted in failure, or captured a few isolated individuals. For
example, one specimen has been ta'ren from the Di11 ~~illiams Arm of
Lake Havasu since 1973 (Hichaei_ Donahoo, USFti~]S, pers. comrtun.;
Hinckley 1979; CDFG, unpubl. data). One razorback sucker was
collected and another observed i.n the mouth of PaYia River,
Arizona, by Mirrckley and Carothers i-t 1979, and an adult r~zrori:sac};
was taken by AGFD personnel (Ja7~nes Brook._s, AGED, p;,rs. corns.~un. } in
1954 frozerand Canyon n~~a.r Br_ ic~ht Anc3t~l Creek.
Razorback sucker. has not b~~Gn recorded in Nz~w P9~~~xico,
althouUll it must havo formerly occurr.ec~ in the San ,7uGn Ri~,y~~r and
pe,~h<~ps in the Gila t~.iv~r main:at~r-eam.