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1. -. . . I I I I I I I I I I I I I I I Table 11. Density estimates at Lily Park, Yampa River 2000 to 2003 IYAMPA RIVER Density estimate in fish per hectare iUl\' Park Nolha nolha Nolha Species 2000 2001 2003 Total fish 1001.5 528,9 680,00 Flannelmouth sucker 347,5 277.5 250,5 Bluehead sucker 96,8 54,8 57,1 Colorado pikemlnnow 0.4 0,3 0 Roundtail chub 0.4 0.3 0 White S, + hybrids 0,9 0,3 4_0 Channel catfish 513.3 137,3 275,6 Carp 26.0 16.8 33,1 Smallmouth bass 10,6 39.0 51,5 Northern pike 2,6 1.4 1.4 Table 12, Biomass estimates at Lily Park, Yampa River 2000 to 2003. YAMPA RIVER Uh Park Kg/ha Kg/ha Kg/ha Species 2000 2001 2003 Total fish 521.1 253.0 256,8 Flannelmouth sucker 218.4 143,3 122.4 Bluehead sucker 37.2 19,8 18,9 Roundtail chub 0.2 0.01 0 Colorado pikeminnow 0.6 0,7 0 White S, + hybrids 0.4 0,2 2,5 Channel catfish 224.2 56.8 64.0 Carp 29,1 21,5 38.2 Srnallmouth bass 70 8,0 8,2 Northern pike 3,8 2.8 2,6 Biomass estimates of tlannelmouth sucker and bluehead sucker were lower in 200 I and 2003 than in 2000, Also mean length of tlannelmouth sucker and bluehead sucker was lowest in 2003 and highest in 2000 (Table 13). The lower mean length of blue head sucker and tlannelmouth sucker in 2003 was due to fewer large fish in 2003 compared to earlier years, In 2000 about 70% of tlannelmouth sucker were 40 cm or longer and 2 I % were 45 cm or larger. In 2003 only 36% were at or over 40 em and just 2% were 45 em or larger. Bluehead sucker at or over 35 em were typical in 2000 (49%), but were less common at 29% in 2003. The loss ofIarger fish could have resulted from attrition (aging) or more likely, loss of habitat availability for larger fish during the 2002 low-flow conditions, 23