8159

• UCREFRP Catalog Number: 8159
• Author: Trammell, M. and T. Chart.
• Title: Aspinall Studies
• USFW Year: 1999.
• USFW - Doc Type: Annual Assessment of Colorado Pikeminnow Larval Production in the Colorado River, Utah 1992-1996 \
• Copyright Material: NO

Table 2. Summary of Colorado pikeminnow collected in larval drift nets, Colorado River,
1992-1996.
WESTWATER 1992 1993 1994 1995 1996
# of days sampled 53 59 68 36 35
first collection date 3une 29 July 20 June 27 Aug 13 July 12
# days from first to last CPM 44 29 45 17 32
# days CPM collected 25 23 14 9 16
# of CPM 86 156 25 28 58
#CPM/1000 m3 s 1.1 2.5 0.53 1.46 1.64
Total transport abundances 22170 47116 8836 10646 28730
first spawn date June 10 July 3 June 9 July 30 June 20
# days of spawning activity 45 30 19 18 34
MOAB 1992 1993 1994 1995 1996 1996 day b
# of days sampled 55 61 65 48 65 29
first collection date June 29 July 23 June 27 Aug 10 July 15 July 18
# days from first to last CPM 45 27 50 21 37 32
# days CPM collected 39 24 14 19 27 21
# of CPM 289 140 28 358 473 462
#CPM/1000 m3 s 8.8 11.5 1.08 41.7 22.6 37.7
Total transport abundances 225169 220865 124741 824218 858174 890231
first spawn date June 11 June 29 June 5 July 11 June 23 June 28
# days of spawning activity 53 37 46 42 49 35
a: catch rates were calculated only from the first to last day pikeminnow were collected.
b: nets set from 9:00 to 11:00
c: some days were not sampled, thus the difference between number of days sampled and
number of days between first and last Colorado pikeminnow
6