Lake Roosevelt Burbot Population Assessment Project No. 2008-115-00 Jason McLellan Confederated Tribes of the Colville Reservation January 18, 2012.

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Presentation transcript:

Lake Roosevelt Burbot Population Assessment Project No Jason McLellan Confederated Tribes of the Colville Reservation January 18, 2012

Background Status reviews (1997, 2001) “Healthy” Abundance increasing Poor growth/condition Based on by-catch Lack standardized monitoring 2

Background Fall Walleye Index Netting (FWIN) BPA Project No Gill nets Data – burbot by-catch No analysis Burbot monitoring? 3

Goal and Objective Goal - Healthy & harvestable population Objective - Monitor population status and trend 4

Management Questions 1.Is FWIN by-catch adequate for monitoring? 2.Differences between gear types? 3.Most efficient gear for non-lethal capture? 4.Relationship - catch rate and abundance? 5.Status of the population? 5

Project Design Evaluate FWIN ( ) analyze existing data Gear Comparisons ( ) FWIN gill nets, cod traps, trammel nets Stock Assessment ( ) Adapt – gear comparison 6

Study Design Gear Comparison FWIN FWIN gill nets, cod traps, trammel nets GRTS strategy 50 sets/gear November (1 wk) Gear Comparison/Stock Assessment cod traps, trammel nets GRTS strategy 240 sets/gear late Fall - early Spring 7

Analysis FWIN Analyze existing data – year effect, power analysis Gear comparison – gear type and year effects Gear Comparison/Stock Assessment Analyze indices – gear and year effects, power Capture-recapture – abundance & survival Use most efficient after 3 years 8

Analysis AbundanceCatch rate (C/f)ANOVA Proportion positive catch (Ep) Binomial Logistic Regression Capture- recapture Robust DesignSurvival Capture- recapture Robust Design 9

Analysis 10 Size Structure Length- Frequency Cumulative Frequency Distribution Mean LengthANOVA Proportional Size Distribution Ordinal Logistic Regression

Analysis Condition Mean Relative Weight (Wr) ANOVA Length-Weight Relationship ANCOVAGrowth Capture- recapture Absolute Growth Rate 11

Analysis Catch rate – abundance relationship 12

Management Implications Current status and trends Standardized stock assessment protocol Standardized data for management 13

Questions? 14