Aleutian Islands Golden King Crab CPUE Data Standardization

• Main Authors: M. S. M. Siddeek, J. Zheng
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Golden King Crab; Aleutian Islands
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.397.36; http://www.alaskafisheries.noaa.gov/npfmc/PDFdocuments/membership/PlanTeam/Crab/May2012/GKCcpueData512.pdf

Our primary task is to standardize the catch-per-unit-effort (CPUE) of observer pot sample and retained catch data to input to the Aleutian Islands golden king crab assessment model (Siddeek et al., 2011). The January 2012 modeling workshop also recommended to fully document the observer and retained catch data collection method and investigate the compatibility of observer pot sample with retained catch sample length frequencies. This latter task is dealt by Doug Pengilly (personal communication). This document focused on developing a standardization method based on generalized linear model (GLM) for estimating yearly CPUE index. For this report, we used the observer pot sample data for 1990/91-2010/11 for the whole Aleutian Islands region, east of 174W, and west of 174W to test the model selection and CPUE index estimation procedures. We plan to improve on the estimated CPUE indexes for observer data, if there are any suggestions from the crab plan team (CPT) and carry forward the analysis to estimate retained catch CPUE index for the whole region, east of 174W, and west of 174W using 1985/86-2010/11 data. Method Preliminary data processing The observer pot sample data of Aleutian Islands golden king crab totaled 102,965 records for 1990/91-2010/11. The following variables from each record were considered in the model: