Estimating Geoduck Harvest Rate and Show Factors in Southeast Alaska

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Estimating Geoduck Harvest Rate and Show Factors in Southeast Alaska

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Title: Estimating Geoduck Harvest Rate and Show Factors in Southeast Alaska
Author: Rumble, JM; Hebert, KP; Siddon, CE
Abstract: In Southeast Alaska, guideline harvest levels for commercial harvest of geoduck clams are calculated as the product of estimated biomass and a fixed annual 2 percent harvest rate. Prior to applying the harvest rate, biomass estimates are inflated by 20 percent to account for geoducks that were not counted during dive surveys. Use of the inflation factor, termed “show factor”, is intended to produce a more accurate estimate of biomass, by acknowledging that some geoduck siphons remain hidden beneath substrate at the time of survey. The current show factor was calculated with limited data. The current harvest rate was established as a compromise between those rates used for geoduck fisheries in British Columbia and Washington State. This report outlines the background, study plan and data collection methods for this age composition and show factor project. The analysis phase of the project, which has not been completed, will use these recently produced results to estimate parameters used to calculate harvest rate and show factors that are explicitly intended for Southeast Alaska geoduck populations. Additionally, show factors will be calculated for several sites, including geoduck beds with and without evidence of sea otter predation to determine if geoduck shows are influenced by sea otters.
Description: American Academy of Underwater Sciences (http://www.aaus.org/)
URI: http://archive.rubicon-foundation.org/10279
Date: 2012

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