Abundance Estimates Population Numbers Recruitment Natural Mortality

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Presentation transcript:

Abundance Estimates Population Numbers Recruitment Natural Mortality Fishing Mortality Immigration Emigration

Common Abundance Estimates CPE/CPUE (relative density) Depletion/Removal (estimate of N0) Mark-Recapture (estimate of N0) Abundance -- CPE

Catch-Per-Unit-Effort Consider … Lake A – 4 nets, 40 total fish Lake B – 2 nets, 30 total fish Which lake has a higher density of fish? Stream A – 50 fish in 25 minutes of shocking Stream B – 60 fish in 35 minutes of shocking Which stream has a higher density of fish? Abundance -- CPE

Catch-Per-Unit-Effort CPUE or CPE Calculated as (Catch / Effort)*scaling factor Examples 50 Lake Trout in 1600 m of gillnet set for 2 nights 50 Brook Trout in 1600 s of electrofishing Abundance -- CPE

Catch-Per-Unit-Effort Electrofishing Longlines Gillnet Trawling Abundance -- CPE

Catch-Per-Unit-Effort Define Ct = catch at time t ft = fishing effort at time t q = catchability coefficient proportion of population captured w/ one unit of effort What is … q*ft q*ft*Nt q*Nt Thus, CPE measures relative abundance Abundance -- CPE

CPE Measures Relative Abundance ONLY … of portion of stock vulnerable to the gear if q is constant (see readings) Abundance -- CPE

Abundance -- CPE