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washington recfin estimates for puget sound strait

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washington recfin estimates for puget sound strait

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    1. Washington RecFINEstimates forPuget Sound (& Strait) Peter Hahn, WDFW (aka Jennifer Cahalan) August 29, 2006

    3. What is estimated & provided: Catch, effort (trips) & CPUE for the recreational “private/rental boat” mode (with variance). Catch = (a) kept, (b) released. Strata: species mca (of catch) target (salmon, RF, both, cutt. only) ** day type (M-Th, Fri, weekend) * month season (ie. regulations) intercept mca (fishing mode = PB)

    4. What else is estimated: Effort (licensed angler trips) for other fishing modes (beach-bank, manmade (piers), charter-party)

    5. What else is measured/recorded: Fish length Fish weight (Gender - kelp greenling only) Unlicensed anglers

    6. Where: We sample the large geographic expanse of Puget Sound from numerous public boat ramps, throughout marine catch areas 5 through 13. We are organized into 4 regional sampling divisions: Peninsula, North Sound, Central Sound, and South Sound. We sample the large geographic expanse of Puget Sound from numerous public boat ramps, throughout marine catch areas 5 through 13. We are organized into 4 regional sampling divisions: Peninsula, North Sound, Central Sound, and South Sound.

    7. Method Effort (person-trips) estimated via telephone survey of licensed anglers (WDFW license file). CPUE from creel (“intercept”) survey of public ramps. > (Also unlicensed anglers per licensed.) > Some limited CPUE data for other sites/modes (incidental).

    8. Recreational Baseline Sampling (Intercept)

    9. Intercept Site Sampling: All public ramps are sampled Sampling proportional to effort at ramps > (I don’t know details of how sites are chosen each day - but seems treated as simple random sample) > (Is actually cluster sampling.) Catch & # anglers recorded by boat > (licensed & unlicensed) > CPUE = catch/angler trip Oriented to salmon (but rockfish seasons generally tied to salmon seasons)

    10. Intercept Survey (cont.): All boats are attempted to be interviewed, but does not always happen. Daylight sampling only. Fish are observed & counted by species Released catch # & species depends on memory of angler (species ID is cautious) Some lengths & weights taken - I’m not sure of protocol used to select fish) > (kelp greenling gender recorded)

    11. Telephone Survey: Sample frame: electronic POS license data, saltwater-entitled licenses only. >This misses some charter issued non-POS licenses. (minor in Puget Sound) > Some free fishing weekend anglers are also missed Phone numbers are requested but voluntary, about 20% of records with no phone# (both mailing & residence addresses recorded so some can be looked up)

    12. Telephone Survey (cont.): Sample drawn 1-3 days after close of wave 1700 interviews for each “wave” (2 month period) made starting ~4-7 days after close of wave. (10200 / year) Interviews require recall of trips made 1 week & up to ~2.5 months ago. Angler trips made on charter boats are recorded (POS licensed only). (Charter fleet small in Puget Sound.) Night fishing not distinguished.

    13. Telephone Survey (cont.): Example for 2006 Wave 2

    14. Telephone Survey (cont.): Memory recall bias not directly evaluated. (In some cases estimates for salmon (halibut?) could be compared to creel survey estimates, and to catch record card estimates.)

    15. Missing Data: For some strata: (a) Effort data but no intercept (CPUE) > CPUE estimated as the weighted mean over all mca’s of intercept for that mca of fishing (b) Intercept data but no effort data <next slide>

    16. Missing Data (cont.): (b) Intercept data but no effort data > use mean ratio (phone trips/intercept trips) for all mca strata where both data exist > Usually stratified by number of anglers intercepted (usually <10, 10-29, >30 based on a plot of the data in each wave) > ratio times anglers interviewed = effort Note: Increase in phone interviews would reduce this problem.

    17. Missing Data (cont.): (c) Phone interviews where angler cannot remember date (day type) or area > day type &/or area is randomly assigned based on distribution of like known data from interviews

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