Laserfiche WebLink
<br />Trout Population Status in October 1992 and July 1993 versus 1986-1991 <br /> <br />Data for October 1986 - 1991 contained in Tables 5 through 16 were originally <br />presented in another report to the USBOR-DPO (Nehring 1992). The tables have <br />been updated with 1992 and 1993 data for comparative purposes. The October 1992 <br />brown trout and all fish (total trout) density and biomass data (Tables 5 - 10) <br />for most size classes are higher than September 1989, the last year before the <br />100 days of 20 cfs (cubic feet per second) discharge that occurred between early- <br />March and mid-June 1990. Following that 100 day period of 20 cfs discharge, <br />trout density and biomass estimates were severely depressed at most sample sites <br />from October 1990 through October 1991, as shown in Tables 5 through 10 and <br />reported previously (Nehring 1992) . <br /> <br />Table 5. Dolores River trout (~ 15 cm) density (n/ha), 1986 - 1992. <br /> <br />Species 10/86 10/87 10/88 09/89 10/90 04/91 10/91 10/92 <br />IFIIIFIM Site - Metaska Campground - River Mile 0 . 5 <br />IBrown 50 104 57 64(62)a 67 63 24 248 <br />IRa i nbow 27 29 36 89(87) 73 50 64 40 <br />Ic:utts 16 23 13 30(28) 16 5 2 4 <br />IAn Fish 91 145 106 183(177) 142 90 84 245 <br /> Ferris Canyon Campground - River Mile 6 <br />IBrown 26 49 101 116(110) 81 44 95 383 <br />lRainbow 4 4 62 82(63) 55 15 32 18 <br />lcutts 2 8 20 10(9) 2 89 5 2 <br />IAn Fish 31 82 138 208(188) 133 93 132 405 <br /> Rock Stockpile Area - River Mile 10 <br />Brown 18 141 167 99(97) 79 55 74 146 <br />Rainbow 4 21 52 82(71) 55 34 31 25 <br />:Utts 0 2 99 20(18) 0 57 '2 4 <br />Pl.!! Fish 21 165 318 201(191) 131 150 105 175 <br /> <br />a Lower 95% confidence limit <br /> <br />-7- <br />