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1LL during the 1982 reauthorization of the Act, resultin}; in the n~~;o experi- mental category. Final regulations for the experirr-~ntal catt~irc.~ry were nuhli~+1led in the Federal Register on August 27, 1984. Under. the 19 H2 amrrendment, two suhcateg,>ric~S, r~sstanti:~1 and non- essential, were created for the experimental listings. Thesr~ provided approximately threatened and candic}ate degree;s of proter_tion, respectively, for the reintr.oduceci populations, and are determines} by tlir importanct~ of the reintroduced populations to the survival of the species. Other pertinent criteria for the new experimental listings incLrde: reintroductions are to be within the probable historic range of the species, no critical habitat can be declared for nonessential populations, the public must he allowed to comment on the action before retintroductiuns take place, and the experimental populations must be geographically isolated from threatened or endangered populations of the same species. DurinK the period when LJashington was developing the ri~gulations for the experimental populations, Arizona Department cif Game and Fish personnel were locating streams suitable for squawfish arni woundfin reintroductions. Their surveys determined two streams, the Salt River above Lake Roosevelt and the Verde River above Horseshoe Reservoir, still retained enough of their n;3tural characteristics t~ he considered suitable habitat for squawfish (Fig. 1 ). Five potential iy suitable woundfin streams were also located: the Verde River above Horseshoe Reservoir, the C:ila River above San Carlos Reservoir, the San Francisco River above its confluence with the Gila River, Tonto Cree}; above Lake Roosevelt, and the Hassayampa River above Red Cliff (Fig. ?). During this same time period, the Fish and lJildlife Service initiated the extensive doccimentation for listing Colorado squawfish and woundfin under the experimental non essenr_ial category, and began prod,rcin; fish at Dexter NF}1 for the reintroductions. The proposal t~ reintroduce squawfish and woundfin into Arizona was. published on April 10, 1984 and the final regulation on .Tuly 27, 1985; the listings took a`feet 30 days later. Thirty three days after the final puhlicat_ion, on August 26, 1985, 296 Colorado squawfish were transported from Dexter ~1FH and stocked into the Verde River near Perkinsville, Arizona. The fish were over 'a years ~ old and ranted from } 2-16 inches, total. length. Two days later (Auggust 28, 1985), 113 I+ squawfish and 30,000 fry were stacked into the Salt River above Lake P,oosevelt. By the end of September, 1985, over 117,00 squawfish had been reintroduced into Arizona waters. After nearly 35 years, Colorado squawfish again swim in the Gila River basin, and after ma ny years of pape rwork and ef. fort they are c}oing so under the new expo ri- mental nonessential classification. Stockir>t; of squawfish will continue in the Salt and Vedre rivers for up to the next 10 years in an attempt to reestablish a self sustaining population; monitoring will be conducted jointly by the Service and Arizona Department of Game and Fish.