AlaskaSamplingProgra ms Final

Marine Recreational Fishery Sampling Programs in Alaska: 

Marine Recreational Fishery Sampling Programs in Alaska Alaska Department of Fish and Game Division of Sport Fish

Marine Fishery Monitoring Programs: 

Marine Fishery Monitoring Programs 1. Southeast Marine Boat Fishery 2. Southcentral Halibut and Groundfish 200 NM

Overview: 

Overview Southeast Data Collection Southcentral Data Collection Data Analysis

Southeast Alaska: 

Southeast Alaska

Southeast - Objectives: 

Southeast - Objectives Estimate: Chinook salmon harvest (Ketchikan, Sitka, Juneau, Petersburg) and hatchery contribution by tag lot (numerous ports), Mature wild stock Chinook salmon harvest in Juneau spring fishery, Coho salmon harvest (Ketchikan, Sitka, Juneau) and hatchery contribution by tag lot (numerous ports), Age composition of spring Chinook harvest (Juneau and Ketchikan) Mean weight and halibut harvest biomass in Area 2C (by user group) Mean length and round weight of rockfish harvest (selected ports) Mean weight of lingcod harvest (selected ports) Harvest of pink salmon, halibut, lingcod, and rockfish (selected ports) Salmon effort and bottomfish effort (selected ports) Effort and harvest of Dungeness crab, shrimp, and king crab (selected ports)

Southeast - Precision Targets: 

Southeast - Precision Targets

Southeast - Additional Tasks: 

Southeast - Additional Tasks Collect age (scales) and maturity data from Chinook salmon in Petersburg, Wrangell, and Gustavus (through July 2). Collect age data from Chinook salmon in Juneau and Ketchikan (Jul 3 – Sep 24). Collect lengths from lingcod in Gustavus and Elfin Cove (May 15 – Sep 10). Estimate Dolly Varden harvest for Juneau when data adequate. Compute HPUEs from catch samples and creel survey data for use by public and managers. Collect data on released fish to estimate total catch and CPUE. Sample Chinook salmon at False Outer Point for CWT s (Apr-May)

Southeast - Ports: 

Southeast - Ports Sampled ports represent andgt; 90% of landings. Assumed to be representative.

Southeast - Creel Survey Designs: 

Southeast - Creel Survey Designs Direct expansion creel surveys, stratified by weekly or biweekly periods in combination with day type Either 3-stage or 4-stage designs, where stages are access points, days to sample, periods within a fishing day, and vessel-trips. Major ports - multiple technicians, varying schedule Other ports – single technician, sample peak return times 2/3 of days designated 'standard creel days' – emphasis on counting boats and getting salmon effort andamp; catch 1/3 of days designated 'groundfish sampling days' – emphasis on complete creel info and halibut and groundfish biological data.

Southeast – Interviews: 

Southeast – Interviews Misc: time (hour), charter/private, charter boat name and logbook number Target species category Primary ADFandamp;G stat area fished Trip duration (days), rods fished, boat-hours fished Numbers of halibut kept/released/cleaned at sea Numbers of other species kept/released Numbers measured/weighed/inspected for CWTs Inspect all Chinook and coho for CWT, take heads.

Southeast - Biological Sampling: 

Southeast - Biological Sampling Chinook salmon – MEF, CWT, sex, maturity (thru July 3), and pelvic fin clip for genetics Coho salmon – CWT Halibut – FL Rockfish – FL, weight Lingcod – FL, sex All species – private/charter, stat area

Overview: 

Overview Southeast Data Collection Southcentral Data Collection Data Analysis

Southcentral: 

Southcentral

Southcentral - Objectives: 

Southcentral - Objectives Estimate: Mean weight and halibut yield (lb) Length and sex composition of halibut harvest Species composition of rockfish harvest Age, length, and sex composition of rockfish harvest (principal species) Age, length, and sex composition of lingcod harvest Spatial distribution of bottomfish effort and harvest by user group

Southcentral - Precision Targets: 

Southcentral - Precision Targets

Southcentral - Additional Tasks: 

Southcentral - Additional Tasks Halibut otoliths for IPHC Proportion of halibut harvest cleaned and carcasses discarded at sea. Length, sex, age structures, and capture location data from sharks. Tissue samples for analysis of MeHg and other heavy metals. Summary and analysis of catch and harvest rates (CPUE,HPUE)

Southcentral - Ports: 

Southcentral - Ports Sampled ports represent andgt; 90% of landings. Assumed to be representative.

Southcentral - Sampling Designs: 

Southcentral - Sampling Designs One technician per port. A single tech covers Deep Creek and Anchor Point, two techs in Seward in Jul-Aug. Concurrent interviews and biological sampling at Kodiak and Whittier, 5 days per week. Separate interviews (2 days/week) and biological sampling (3 days/week) at all other ports. Interview and biological sampling days distributed proportionally among weekdays and weekends.

Southcentral - Interviews: 

Southcentral - Interviews Misc: time (hour), charter/private, charter boat name and logbook number Target species category Primary ADFandamp;G stat area fished Trip duration (days), total angler-days, boat-hours Numbers of halibut kept/released/cleaned-at-sea Numbers of other species kept/released (pelagic rockfish, other rockfish, lingcod, Pacific cod salmon shark, spiny dogfish)

Southcentral – Biological Sampling: 

Southcentral – Biological Sampling Halibut – FL, sex, otoliths Rockfish – TL, weight, sex, otoliths Lingcod - TL, weight, sex, dorsal fin rays Sharks – PCL, FL, TL, sex, vertebrae or fin spines All species –private/charter, primary stat area

Overview: 

Overview Southeast Data Collection Southcentral Data Collection Data Analysis (halibut and groundfish)

Halibut Mean Weight: 

Halibut Mean Weight Where g = user group (charter/private), a = subarea, and  and  are parameters of allometric length-weight relationship (from IPHC). No correction for log transformation bias (IPHC). Most ports and users:

Halibut Mean Weight: 

Halibut Mean Weight wsea estimated from sample of carcasses of fish cleaned at sea and retained for the sampler. psea and pport are estimated from interview data. Homer charter only:

Halibut Yield: 

Halibut Yield Where Y = recreational harvest in pounds, and H = harvest in numbers of fish (estimated by SWHS). g = user group (private/charter) a = subarea within IPHC area

Rockfish Mean Weight: 

Rockfish Mean Weight Where s = species, a = subarea, and  and  are parameters of allometric length-weight relationship. Weigh subsample, test for differences between ports, sexes, and years with GLM. Use species-specific regressions if sample size adequate and regressions cover wide range of lengths, otherwise use assemblage regression parameters

Rockfish Yield: 

Rockfish Yield s = species a = subarea H = harvest of all rockfish species (SWHS, number of fish) p = species composition proportion

Rockfish Discards: 

Rockfish Discards Southeast – assume 100% mortality of demersal discards for calculation of state and federal waters ABC. Southcentral – no estimates yet of discard mortality State and federal waters managed separately, recreational harvest ignored in federal waters ABC. No assessment or allocation or rockfish in state waters Discrepancies in estimates of proportion released between SWHS and port sampling. Assemblage composition is only information on releases; no species, length, or depth information

Lingcod Mean Weight and Yield: 

Lingcod Mean Weight and Yield a = subarea, and  are parameters of allometric length-weight relationship. Weigh subsample, test for differences between ports, sexes, and years with GLM. Ha = harvest in numbers of fish

Lingcod Discards: 

Lingcod Discards Discard mortality not included in harvest estimates in Southeast or Southcentral regions. Discrepancies in estimates of proportion released between SWHS and port sampling in Southcentral (except Seward). No size information on released fish. Believe release mortality is low (0-4.3%), depth not a factor.

Adequacy of Data: 

Adequacy of Data Halibut yield estimates reviewed, used by IPHC, NPFMC Relative precision typically around 5% (95% conf) Rockfish yield estimates from Southcentral have relative precision around 15-25% Estimates are precise and accurate enough to meet management needs.

Any Questions?: 

Any Questions?