U.S. Dept Commerce/NOAA/NMFS/NWFSC/Publications
NOAA-NMFS-NWFSC TM-9: Effectiveness of Predator Removal for Protecting Juvenile Fall Chinook Salmon Released from Bonneville Hatchery, 1991

Appendix Table B1. Northern squawfish electrofishing daily effort and catch results, 1991.

Electrofishing perioda Electrofishing date Electrofishing locationb Start timec Effort (sec)d Catch (no.) CPUE (no./h)e
1 25 Jun O1 0315 340 4 42.5
1 25 Jun O1 0340 729 8 39.5
1 25 Jun O1 0605 1,123 59 189.1
2 25 Jun O1 2115 1,476 66 161.0
2 26 Jun O1 0335 1,987 96 173.9
3 26 Jun O1 2107 1,411 82 209.2
3 27 Jun O1 0300 1,641 24 52.7
4 27 Jun O1 2200 1,451 55 136.5
4 28 Jun O1 0405 1,268 28 79.5
     Subtotal
11,426
422
--
     mean 1,270 47 120.4
     SEf 163.6 10.8 22.5
 
1 25 Jun O2 0419 1,350 26 69.3
2 25 Jun O2 2139 2,049 49 86.1
2 26 Jun O2 0345 1,298 40 110.9
3 26 Jun O2 2208 2,137 64 107.8
3 27 Jun O2 0444 1,761 42 85.9
4 27 Jun O2 2210 2,249 69 110.5
4 28 Jun O2 0444 1,441 30 75.0
     Subtotal
12,285
320
--
     mean 1,755 46 92.2
     SE 150.2 6.1 6.6
 
1 25 Jun O3 0510 1,595 22 49.7
2 25 Jun O3 2213 1,376 102 266.9
2 26 Jun O3 0428 1,237 47 136.8
3 26 Jun O3 2343 2,024 66 117.4
4 27 Jun O3 2314 1,369 42 110.5
4 28 Jun O3 0345 1,862 66 127.6
 
Electrofishing perioda Electrofishing date Electrofishing locationb Start timec Effort (sec)d Catch (no.) CPUE (no./h)e
     Subtotal
9,463
345
--
     mean 1,577 58 134.8
     SE 126.6 11.2 29.2
 
2 25 Jun O4 2353 1,621 53 117.7
3 27 Jun O4 0352 1,895 58 110.2
     Subtotal
3,516
111
--
     mean 1,758 56 113.9
     SE 137.0 2.5 3.8
 
2 26 Jun TC 0305 640 32 180.0
3 26 Jun TC 2200 1,609 33 73.8
4 27 Jun TC 2115 688 8 41.9
4 28 Jun TC 0440 171 2 42.1
     Subtotal
3,108
75
--
     mean 777 19 84.5
     SE 301 3.0 32.7
 
1 25 Jun W1 0304 1,035 52 180.9
1 25 Jun W1 0600 1,049 35 120.1
2 25 Jun W1 2105 1,232 61 178.3
2 26 Jun W1 0258 1,553 89 206.3
3 26 Jun W1 2110 1,924 59 110.4
3 27 Jun W1 0252 1,482 83 201.6
4 27 Jun W1 2101 1,652 37 80.6
4 28 Jun W1 0247 2,065 76 132.5
     Subtotal
11,992
492
--
     mean 1,499 62 151.3
     SE 135 7.1 16.5
 
1 25 Jun W2 0400 2,638 33 45.0
2 25 Jun W2 2215 2,591 46 63.9
2 26 Jun W2 0435 1,599 24 54.0
3 26 Jun W2 2300 2,240 39 62.7
Electrofishing perioda Electrofishing date Electrofishing locationb Start timec Effort (sec)d Catch (no.) CPUE (no./h)e
4 27 Jun W2 2250 2,136 23 38.8
     Subtotal
11,204
165
--
     mean 2,241 33 52.9
     SE 188 4.4 4.9
 
2 25 Jun W3 2345 1,551 16 37.1
3 27 Jun W3 0010 1,458 29 71.6
4 28 Jun W3 0300 1,159 2 6.2
     Subtotal
4,168
47
--
     mean 1,389 16 38.3
     SE 118 7.8 18.9
 
2 26 Jun W4 0045 2,471 25 36.4
3 27 Jun W4 ---- 1,200 10 30.0
     Subtotal
3,671
35
--
     mean 1,836 18 33.2
     SE 636 7.5 3.2
 
     Totals 70,833 2012 --
     mean 1,567 39.4 91.3
     SE 136.8 6.1 14.2

aSampling periods generally began at 2100 h and terminated the following morning about 0900 h.
bLocations codes (2 characters): TC - Tanner Creek transect; others Columbia River transects, where 1st character O = Oregon shoreline and W = Washington shoreline; 2nd character, 1-4, transect areas (refer to Fig. 3 for precise locations).
cTime that the electrofishing effort began.
dTime that the electrofishing unit was powered on.
eCPUE = Catch of northern squawfish per unit effort of electrofishing.
fSE = Standard error.

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