85 



TABLE 28 Estimated numbers (N/1000 ft) and biomass (lbs/1000 ft) of rainbow 

 trout by age groups in the Wheat Section (9908 ft) of the Beaverhead 

 River between 1968 and 1976. 80% confidence interval in parenthesis. 



TABLE 29. Estimated numbers (N/1000 ft) and biomass (lbs/1000 ft) of brown 



trout by age groups in the Blaine Section (17837 ft) of the Beaverhead 

 River between 1971 and 1976. Rainbow trout were too scarce to 

 estimate. 80% confidence interval in parenthesis. 



1971 Aug. --9 9 3 21 (± 6) — 8.4 13.3 8.3 30.0 (±7.0) 



1972 Sept. 9 10 10 4 33 (± 5) 3.9 11.3 15.9 9.1 40.2 (±6.4) 



1975 Apr. - 14 —26 40 (± 4) — 7.5 34.1 41.6 (±3.8) 



1976 May — 22 —28 50 (±11) — 9.5 36.2 45.7 (±10.9) 



1L_ 



