Table 14. Estimated numbers and biomass (lbs) of • trout by age-groups 

 in a 10-mile section of reach #1 of the Big Hole River in 

 September 1977 and 1978. Eighty percent (80%) confidence 

 interval in parenthesis. 



Age-Groups 



September 



1977 



1978 



BROWN TROUT-NUMBERS 



11+ 



III+ 



IV+ & older 



2,805 

 1,974 

 1,367 

 6,146(+983) 



2,991 

 2,075 

 1,617 

 ^7683 (+1,0 31) 



RAINBOW TROUT-NUI-IBERS 



11+ 



III+ 



IV+ & older 



377 

 137 



201 



715(+315) 



1,030 



262 



189 

 l,481(+574) 



Total Numbers 6 , 861 (+1, 032) 



8,164(+1,180) 



BROWN TROUT-POUNDS 



7,826(+l,207) 



2,472 

 2,674 

 3,373 

 8,519(+1,267) 



RAINBOW TROUT-POUNDS 



11+ 



III+ 



IV+ & older 



257 

 152 



345 



754(+264) 



656 

 267 

 318 



1,241(+413) 



Total Pounds 8,580 (+1, 236) 



9,760(+l,333) 



48 



