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------- , r-. . . . .--"'\ . . ~ . r . . University of Nel~ Hexico for accurate identi fieation. V A total of 14 different species were collected from the San Juan and Pine Rivers. These species include the flannelmouth sucker, (Catostomps latiDinis), the whitc sucker, (r.~.tostonlUs. cOlr;mersoni), the bluehcad Bucket", (Pantost"ps ~i.tl.l.\S.), the speckled dace, (Rhipichvthys ASClIlllS), the bonyta.i.l chub, (G.fu robust,,), the Colorado River squswfish, (Pr.ychocheilus ~lICill"), the mottled sculpin, (Cottus .M.i.[Q.i), the brown trout, (~ trutta), the ca.rp, (Cyprious carpio). the fathead Ininnol~, (Pimphal "" J;U.Q.llOill..:o), the channel c~tfi sh, (Ict~lllrus punctnt'ls), the black bullhead, (lctalurus 1Illl.l.rul.), the bluegill, (I'''pO'~iS machroohit"lls) and the groan sun- fish, (Le~omis cyanellus). The flannelmouth sucker and the bony tail chub were the most abundant species, nearly oon.half of the total number of fish found. Only four brown trout were found in the San Juan and Pine Rivers. The fish species found in the Navajo River wet"e the Sar.le as thosa found in the San Juan snd Pine Rivers, rainbow trout, (~ ~airdDe~ii), was the only additional species found. l'ra.sh fish were. the most dominant species, however, the rainbow and brown trout were r.lore abundant than trout found in the San Juan and Pine Rivers. The \"otcnone tre~tment I~as very successful. Good results, nearly totd kill, IJas obtained dOlmstresm to ~'rui tland, New Hcxico, approximately 40 miles below the Navajo Dam. This made a total of approximately 75 miles of the San Juan River that wi. s . t rea.tecl. As yet, no watet" has been impounded by the NaVajo Dall! and the pt"csent anticipated closure will be sometime during the spring of 1962. This will be approximately eight months after the rotenoning. The llumber of fish moving into the treated areas of the San Juan and Pine Rivers is not known at the present time. }'ig. 3. A typical sample of the San Juan River fish population. Fig, 4. Bonyts! 1 chub co ilec ted frem San Juan River. F-l9-D-4. Job No. C.16.4 3 .