9458

• UCREFRP Catalog Number: 9458
• Author: National Park Service.
• Title: Workshop on Population Estimates for Colorado Pikeminnow and Humpback Chub.
• USFW Year: 2001.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

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DEC-04-2001 rUE 11:59 AM FISHERY & WILDLIFE

Spring 2001 Sampl ing Results

. About 500 (260) river miles sampled over 3
to 4 sampling occasions
. 1,191 hours (365) of el ecrro fishing , 294 hrs
fyke net-sets
. Total of 1,295 (1,136) Colorado
piken'1innow captures, 1,155 individuals,
140 recaptured once, 8 fish recaptured twice
· Recaprure proportion about 13%

Middle Green River sampling,
2000

. A tOlal of 4 passes completed
. 29 sampling days
. 177 hours (22 days) elc:ctrotishing time
· Total of 639 individuals captured
(ISMP 1991-1999 = 1.048 fish)
. Total of 83 recaptures (six twice), 13% rate

Green River abundance
estimates, 2000 (4-pass data)

Model N-hat.. SE CI n-hl.ts
Ml 2,037 183 1723.24550.08,0,1.0.13,0.05

2,102 191 1775-2538

Mo

0.09

FAX NO, 9704915091 p, 04

Study Area

Middle Green River sampling,
2001

. A total of 4 (4) passes compleled
. 31 (29) sampling days
. 253 hours (177) clectl"oflshing time
· Total of 358 (639) individuals captured
(ISMP 1991-1999 "'1,048 fish)
. Total of 36 recaptures (one twice), 10% rate

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