Table 1. Summary of Control and Containment and Monitoring at Lake Davis for 2000

Control and Containment

Activity

Objective

Frequency

Time Period

Experimental Control Measures (i.e. barriers, detonation cord, electrofishing, and encircling nets). Remove and eliminate northern pike. Timed to emigration of larvae and location of pike through sampling. Ice-out through October.
Block tributary streams. Prevent northern pike access to tributary streams. One-time construction activity with annual repair. March.
Block in-lake spawning areas. Prevent and reduce northern pike spawning. Ongoing. Ice-out through June.
Reduce pike food supply. Retard northern pike growth. Ongoing. Ice-out through October.
Encourage fishing. (e.g. derbies) Remove and eliminate northern pike. As determined. Ice-out through October.
Drag nets and purse seines. Remove and eliminate northern pike. Gill nets - ongoing.
Seining - weekly.		 Ice-out through June.
May and June.
Electrofishing. Remove and eliminate northern pike. Weekly. Ice-out through October.
Electrofishing to herd pike to traps and nets. Remove and eliminate northern pike. Monthly. Ice-out through October.
Grizzly Dam modifications (e.g. spillway barrier, reconfigure outlet, install electric device, etc.) Prevent escape of  northern pike. Ongoing. As soon as feasible.
Fyke nets and trap nets. Remove and eliminate northern pike. Ongoing. Ice-out through June.
Stock brown trout. Increase predation on pike. Annual planting. Spring.
Enforcement. Prevent movement of northern pike to other waters. Ongoing. Ongoing.
Public Education. Prevent movement of northern pike to other waters and inform public of DFG actions. Ongoing. Ongoing.

Monitoring

Activity

Objective

Frequency

Time Period

Electrofish sampling in Lake Davis. Develop index of abundance for resident fishes and collect northern pike for study. Two days or nights during each two week period. Ice-out through November.
Electrofish sampling in tributaries.

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 Sample each tributary twice monthly. July through October.
Box trap sampling.

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 Ongoing, service traps weekly. Ice-out through November.
Gill net sampling.

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 Set nets for 48-hour period every other week. Ice-out through May.
Egg and larvae fish sampling. Develop index of abundance for larvae northern pike, and collect life history information. Weekly. Ice-out through June.
Angler surveys. Collect information on angler success and catch. Ten days per month. Ice-out through October.
Electrofish non-contaiment waters. To determine if pike have escaped. Once weekly. Continuous.