Box Canyon Reservoir Fish Sampling

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Warmwater Fisheries Surveys of Box Canyon Reservoir Pend Oreille County, Washington 2004 - 2009 - 2011

The 2011 pike population level is not sustainable

Since 2004, we have seen: • Significant increase in northern pike abundance • Significant decrease in abundance of many other species  Largemouth Bass     

If left alone, the increasing pike population will impede efforts to: • Maintain a viable recreational fishery  Pike will become overabundant, stunted, and unattractive to anglers

Black Crappie Yellow Perch Pumpkinseed Peamouth Northern Pikeminnow

 Overabundant pike population will inhibit the production of other preferred native and non-native fish populations within the reservoir

• Achieve the short-term, mid-term, and long-term conservation goals for Box Canyon Reservoir Number of River Sections Sampled by Gear Type 2004-2011

140

2004

120

Number of Sections

2009

100

2011

80 60 40 20 0 Electrofishing

Gill netting

Fyke netting

Gear Type

Number of Northern Pike

250

Total Number of Northern Pike Captured 2004-2011

200

150

100

50

0 2004

2009

2011

Year of Fisheries Survey

Electrofishing Catch Per Unit Effort 2004-2011

Gill Net Catch Per Unit Effort 2004-2011

220

20

2004

2004

200

18

2009

2009

2011

Mean number per hour

160 140 120 100 80 60 40

Mean number per net-night

180

16

2011 14

12

10

8

6

4

20

2

0

0