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"..... . . "'" t/ ..' ...... . , . five snd ten miles downstreSm respectively. The upper station on the San Jusn River was loca.ted at the stateline near Rosa, New Mexico. The second station was eight mi les dOI~nstt'eam and the third was eighteen miles below the statelt'ne, A fout'th station was set up On the San Juan River a. fow miles sbove the dam loca.tion but the results obtained from the three upper stations were sufficient and thi s ono wa.s not used. The t'otenone concentrations were identical fot' each rivet'. The upper stations ,,'ere scheduled for concentrstions of 2.0 ppm, the second 1.0 pp.., and the third was 0.5 ppm. ThQ stations at the statelina warQ oPQratnd for 4l\ houn. The sta.rting times for the lower sts.tions I,'ere delayed to obtain maximum benefits from the rotenone released by the upstl'eam stations. Two-man teams traveled the full length of tho treatment sress of both rivers trea.ting the pools and other a.reas not connected 1~1th the main river channels. The rotenone fat. the Navajo River Wa.s furnished by the New Mexico Dcpartmant of Gama snd Fish. Jack Des.n, Biologist for the U. S. Fish and Wildlife Set'vice WB.S in charge of this portion of the project. One hundred and twenty gallons of rotenone was applied to the Na.va.jo River from four different drip stations. For the San JUan River we used 2,2BO ga.llons of rotonone. At the sta.telina station thQ rotanona wa.S s.pplied a.t s. ra.te of 27.5 ga,llona per hour to supply the pre-determined concentra.tion of 2.0 ppm. RiVet'. gaUons The volume of water in the Pine River is much less than that Therefore, the volume of rotenone r"quired was much less. a for tho three sta.tions. of the Ss.n JUSn tota.l of 1,110 Tho two crews working the side pools along the San Juan and Pine Rivers used 90 gallons of rotenone. Nine barrels or 270 gallons of rotenone were used to treat 0 small lo.ke ct'eated during tho construction of the Navajo Dam. This lake is separated from the San Juan River by ll. small diko. A total of 3,870 gallons of rotenone was used for the entire oPQration, s.ll jobs included. TIte prolonged treatment (48 hours) was scheduled to insure thorough mixing of the rotenone through aU sections of the t'1ver. Also, for a. sufficient trea.tment to insure s. good kill of the more resistant species. Finr!;ng~: Water tempera.tures during the rotenone operation va.ried from s. low of 560 f. in the Pinn RiVal' and a, high of 670 F. in the San Juan Ri-vor. Heavy ra.ins prior to the project starting time lowered the wa.tet. temperature in both rivers and a slight wet'ming trend was noticed during the opera.tion. 'rhe si:o;e of this pl'oject and weight of the fi sh ki lled. all fish species present. 'I'his made it impossible to determine the tota.l numbers However, an attempt ws.s msde to collect a. saUlple of colloction ws.s sent to Dr. William J. Koster of the F-19-D-h, Job No. C-16-4 .2- , .